What is the weather like on Ibiza in September?
In September, Ibiza shows its pleasantly mild side. High summer is drawing to a close, while the island still offers wonderfully warm temperatures. The nights do get a little cooler, but Ibiza weather in September remains ideal for numerous outdoor activities.
Average daytime and nighttime temperatures
September on Ibiza impresses with pleasant temperatures. During the day, the highs average between 24,4°C and 27°C. Especially in the first half of September, temperatures can still feel quite summery. This makes September an ideal month to travel for anyone who wants to avoid the oppressive heat of peak summer.
Night-time lows fall to an average of 19,6°C to 22,7°C[41]. These pleasant night temperatures ensure restful sleep without the humid heat of peak summer. However, by the end of the month it can already feel noticeably cooler, so a light jacket is definitely sensible for the evening hours.
The average daytime temperature in September is around 22°C to 24°C. This means September still remains clearly above the 20-degree mark. These values make the month a popular time to visit Ibiza, as the climate is neither too hot nor too cool. Temperatures only gradually decrease over the course of the month, with the transition from summer to the island’s mild winter becoming clearly noticeable.
Hours of sunshine and daylight duration
In September, Ibiza treats its visitors to plenty of sunshine. The average number of hours of sunshine is between 7,9 and 10 hours per day[51]. This makes September one of the sunniest months on the island, even though sunshine duration decreases slightly compared with midsummer.
The length of daylight in September gradually shortens over the course of the month. At the beginning of September, a day still lasts about 13 hours, while by the end of the month it shrinks to just under 12 hours. On 1 September, the sun rises at 7:23 am and sets at 8:24 pm, while on 30 September it already rises at 7:49 am and sets at 7:38 pm. Despite this shortening, there is still plenty of daylight for long beach visits and other outdoor activities.
Cloud cover is relatively low at an average of 38%. This means that the sky over Ibiza in September is mostly clear or only lightly clouded, making the island a true sunshine paradise.
Chance of rain and rainfall
Although September on Ibiza already marks the start of the rainy season, the number of rainy days remains manageable compared with the following autumn months. The chance of rain is 3 to 5 days throughout the month[51]. This means that the vast majority of the month stays dry and sunny.
Average rainfall varies by source between 42 mm and 74 mm. It should be noted that rain on Ibiza in September often falls in the form of short but intense showers. Toward the end of the month, the likelihood of precipitation increases slightly, and summer thunderstorms with heavy showers can occur. After such rain, the island appears in a particularly fresh green.
Climatically, September is a transitional month, already showing the first signs of autumn while still retaining many of summer’s advantages. With relative humidity of around 75%, it also offers pleasant conditions for a wide range of outdoor activities.
By the way, September, together with June, is considered the best time to travel to Ibiza, as temperatures are summery but not oppressively hot. For sunseekers and beach lovers, Ibiza remains a popular destination between May and September, with September also offering the advantage that the main season is over and the island returns to a more relaxed rhythm.
Weather progression over the month: beginning, middle, end
September on Ibiza unfolds like a gentle transition from midsummer to milder autumn days. As the month progresses, the weather changes noticeably – yet Ibiza remains a sunny paradise with pleasant temperatures. Let’s take a look at how Ibiza September weather develops over the course of the month.
Weather at the beginning of September
At the beginning of September, Ibiza still shows its summer side. Temperatures are especially inviting at this time and range between 26°C and 29°C during the day. At night, it cools down to a pleasant 22°C to 23°C, ensuring restful nights. The sea temperature stays constant at a warm 26°C, ideal for long swimming outings.
The first days of September delight visitors with plenty of sunshine. On average, the sun shines between 10 and 10,8 hours a day, leaving plenty of time for beach visits or trips into the island’s interior. Rainfall is minimal at this point, with values between 1,2 and 8,3 mm.
In addition, Ibiza at the beginning of September features clear skies and low cloud cover. The high temperatures make not only beach days possible, but also relaxed outdoor dinners – without needing an extra jacket.
Weather in mid-September
By mid-September, a slight cooling trend becomes gradually noticeable. Daytime temperatures drop to between 23°C and 25°C. Night-time temperatures now range between 20°C and 21°C – still pleasantly warm, but with a hint of autumn freshness.
The Mediterranean cools only slightly and remains at a very comfortable 25°C to 26°C for swimmers and water sports enthusiasts. Daily hours of sunshine decrease slightly to 9,4 to 9,9 hours, but still provide plenty of sun for all holiday activities.
Although the chance of rain increases somewhat, rainfall remains very low at 0,6 to 1,9 mm. Cloud cover increases compared with the beginning of the month, but sunny days still dominate. During this time, the island begins to empty out as the high season ends, promising a more relaxed stay with less crowded beaches.
Weather at the end of September
The end of September marks a more noticeable transition into the autumn season on Ibiza. Daily highs now reach 22°C to 23°C, while nights become noticeably cooler at 19°C to 20°C. On some evenings, a light jacket or long-sleeved shirt may already feel comfortable.
The sea temperature drops to around 24°C to 25°C, but remains warm enough for extended swimming. Sunshine duration shortens to 8,0 to 9,4 hours per day. As daylight decreases, the atmosphere on the island changes too – sunsets come earlier and feel more intense.
Toward the end of the month, the chance of precipitation increases. Summer thunderstorms with heavy showers can even occur, though they are usually short-lived. These rain showers clear the air and make the island glow in fresh green. Still, the total number of rainy days remains manageable at an average of 4 days throughout the month.
Interestingly, Ibiza often sees particularly clear days after rain showers at the end of September, creating stunning light conditions – a dream for photographers and nature lovers. The cooler temperatures also make longer hikes and exploration tours more pleasant than in the hot summer months.
The last days of September on Ibiza nevertheless retain summer-like qualities. With average daytime temperatures around 22°C to 23°C and a sea temperature of 24°C, Ibiza weather at the end of September offers the best conditions for holidaymakers who want to enjoy the island in its quieter phase.
Despite the noticeable cooling over the course of the month, September remains an excellent month to travel overall. While the beginning of September still brings peak-summer conditions, the end of the month reveals the island’s more relaxed autumn side – without losing its Mediterranean warmth. This gradual change makes September a particularly versatile travel time for Ibiza visitors.
Water temperature and swimming conditions
For beach lovers, sea temperature is a crucial factor when planning a holiday. Fortunately, September on Ibiza is one of the best months for water sports enthusiasts, as the Mediterranean is still pleasantly warm after the hot summer months.
Ibiza September weather sea temperature at a glance
The average sea temperature around Ibiza in September is 25,3°C. After midsummer, the Mediterranean has reached its highest temperature and cools down only very slowly. In fact, depending on the exact location and time of day, values range between a minimum of 23,7°C and a maximum of 27°C.
The comparison with other months is especially interesting. While sea temperatures in midsummer (July/August) are 25°C to 26°C, the sea in September remains almost just as warm at around 25°C. This is because the water stores the summer heat and cools down only slowly.
Along different coastal sections of the island, sea temperatures remain remarkably consistent. In Eivissa (Ibiza-Stadt) we measure an average of 25,3°C, in Portinatx 25,2°C and in Cala de Sant Vicent about 25,4°C. This slight variation makes it possible to find pleasant swimming conditions on practically every beach on the island.
Is the sea still warm enough in September?
We can answer the question of whether the sea is still warm enough for swimming in September with a clear “Yes”. With sea temperatures averaging 25°C, the Mediterranean around Ibiza offers ideal conditions for long swimming outings and all kinds of water sports.
For comparison: the average sea temperature over the course of the year on Ibiza is 19°C, while in summer it is 24°C. September at 25°C even exceeds this summer average! Even toward the end of the month, the sea temperature hardly drops and continues to hover around 24-25°C.
Experts describe swimming in September on Ibiza as “pleasant swimming”. While temperatures in midsummer can sometimes be almost too warm, September offers the perfect balance – warm enough for hours of swimming fun, but no longer oppressively hot.
In addition, the decreasing intensity of the sun’s rays makes swimming especially pleasant in September. The risk of sunburn still remains, but it is lower than in the peak summer months.
Best beaches for late-summer swimming
September is ideal for exploring Ibiza’s beaches, as the tourist crowds have already left and even the more popular beaches offer more space again. In addition, the warm sea temperature of an average of 25,3°C ensures that swimming enjoyment is guaranteed along all coastal sections.
However, there are differences in local conditions. In some bays such as Cala de Sant Vicent, the sea temperature even reaches up to 26,8°C, making it an ideal spot for those who love warm water swimming.
For families with children, the shallow, sheltered bays in the south of the island are recommended, as the water is often a little warmer here and conditions are calmer. The northern beaches, on the other hand, offer more privacy, as they are less crowded.
Although 3-4 rainy days are to be expected in September, swimming conditions remain excellent overall. Cloud cover averages only 18-19%, which means the sun shines almost continuously and keeps the water pleasantly warm.
The Ibiza September water temperature weather therefore remains a key advantage for a late-summer holiday. The combination of warm air temperatures around 25°C, an average water temperature of 25°C as well, and the more relaxed atmosphere after peak season makes September an insider tip for swimming enthusiasts.
Anyone looking for the perfect mix of pleasant temperatures, less hustle and bustle, and still summery swimming fun will find ideal conditions in Ibiza in September.
Wind, UV index and weather extremes
In addition to temperatures and rainfall, wind, UV radiation and weather extremes play an important role in holiday planning. These factors can make the difference between a pleasant stay and unexpected challenges. Let's take a closer look at these aspects of Ibiza September weather.
How windy is it in September in Ibiza?
The wind conditions in Ibiza in September are moderate. The average hourly wind speed is 15,0 kilometer per hour at the beginning of the month and gradually increases to 16,8 kilometer per hour over the course of the month. We especially notice this slight increase in exposed coastal areas.
Compared with other months, September is relatively calm. In fact, July and August are the least windy months, with an average of 13,6 kilometer per hour, while December is the windiest month at 21,4 kilometer per hour. September therefore forms a gentle transition into the windier autumn and winter months.
The prevailing wind direction is particularly interesting: in September, the wind mainly comes from the east, with the highest share on 1 September at 47%. These easterly winds provide a pleasant cooling effect on hotter days.
For water sports enthusiasts, the wind conditions in September are almost ideal. Wind speeds usually range between 2-4 Beaufort, which means light to moderate breezes. However, note that mornings tend to be calmer than afternoons - an important detail for planning sailing trips or windsurfing activities.
UV index: How strong is the sunlight?
The average UV index in Ibiza in September is 6, which is classified as “high”. This means the sunlight remains intense and requires appropriate protective measures. For comparison: in the summer peak months of July and August, the UV index is 7, while in the winter months it drops to 4.
A UV index of 6 calls for the following precautions:
- Avoid direct sun exposure between 10 and 16 Uhr
- Consistent use of sunscreen with a high sun protection factor
- Wearing sunglasses with UVA and UVB protection
- Using shaded spots during lunchtime
It is especially important to note that sunlight is significantly intensified by reflection from water and sand. This can mean that fair-skinned people can get sunburned after just 20 minutes in the sun if unprotected. The UV index remains stable throughout September, but decreases slightly toward the end of the month.
Temperature records and outliers
Although average temperatures in September are a pleasant 20-27°C, weather extremes can still occur. Toward the end of the month, the likelihood of summer thunderstorms with heavy showers increases. These short but intense rainfalls clear the air and leave the island a fresh green.
Although Ibiza is generally known for its balanced climate, certain strong winds can occur. The Mistral, a northerly wind, can blow at speeds of up to 50 knots (around 92 km/h) and raise wave heights to as much as 3 meters. In September 2018, for example, the Spanish weather service AEMET issued a storm warning for Ibiza because wind speeds of 6 to 7 Beaufort (over 50 km/h) were expected.
The Scirocco, a southerly wind that can bring heat and Sahara dust, occurs mainly in the low season in spring or autumn - September is therefore one of the potentially affected months.
Despite these possible extremes, average wave heights under normal wind conditions remain between 0,5 and 1 meter, ensuring pleasant swimming conditions. The constant sea breeze along the coast makes even warmer days very bearable, while the heat inland can feel more intense without this natural cooling effect.
Nevertheless, Ibiza September weather is one of the most pleasant of the entire year - with the perfect balance of summer warmth, moderate wind and decreasing, but still respectable, UV radiation.
Ibiza in September compared with other months
Ibiza changes throughout the year, and September occupies a very special place in that cycle. How does this transitional month differ from other travel periods, and why should we consider it for a visit?
Differences from July and August
While July and August are considered the absolute high season, September offers a welcome break. Temperatures in September range between pleasant 24°C and 27°C, compared with August highs of up to 31°C. At night, September remains pleasantly warm at around 19°C, though a little cooler than in July and August, where nighttime temperatures rarely fall below 22°C.
The difference in visitor numbers is especially noticeable. Compared with the crowded August, the island is significantly emptier in September. Concretely, this means shorter waiting times in restaurants, more space on the beaches and an overall more relaxed atmosphere. On the one hand, the club scene remains lively in September; on the other hand, many promoters are already starting their closing parties with special headline DJs.
Unlike the almost rain-free summer months (July and August have just 1-2 rainy days on average), the likelihood of rain increases slightly in September. However, the total remains manageable at 3-5 rainy days per month.
What makes September special?
For many, September is considered an insider tip and the best time to visit Ibiza. The combination of summer temperatures without the oppressive heat and fewer tourist crowds creates a special balance. Between June and September, average temperatures are a pleasant 25-30°C, with September's more moderate warmth making it ideal for active holidaymakers.
In fact, the atmosphere on the island changes overnight. After the hectic August period, Ibiza slowly returns to its original, relaxed rhythm in September. The island appears much greener and more fertile than in the dry months of July and August.
Another advantage: prices for accommodation and flights drop noticeably after peak season. While they are still at summer levels, they are significantly lower than in expensive August. For a return flight, you should expect to pay around 150 to 250 € in September.
Ibiza weather at the end of September vs. October
Although both months are part of the low season, there are notable differences. At the end of September, daytime highs are still around 22-23°C, while in October they can drop to 23,5°C. Nighttime temperatures fall from around 19°C at the end of September to around 16°C in October.
The most noticeable difference is rainfall. While 3-5 rainy days are to be expected in September, October marks the start of the real rainy season, with its peak. Average rainfall rises sharply from low levels in September to 81,5 mm in October.
In addition, the warmer water still makes swimming very pleasant at the end of September. With water temperatures of around 24-25°C, swimming remains enjoyable, while temperatures in October can slowly drop below the 21°C mark. Nevertheless, from June to October the sea has a water temperature of at least 21°C, making it suitable for a swimming holiday.
For many Ibiza insiders, September is the perfect compromise - still summery warm, but without the drawbacks of the crowded high season. While October already shows clearer signs of autumn, Ibiza weather at the end of September still retains many summery qualities.
Insider tips for activities in late summer weather
The pleasantly mild late summer on Ibiza opens up numerous possibilities away from the tourist trails. With the cooler temperatures, the island unfolds a special charm for explorers and connoisseurs.
Hiking and enjoying nature
The mild temperatures in September make this month ideal for hikes through Ibiza's diverse natural landscapes. The coastal hikes in particular offer breathtaking views of the Mediterranean. The trail to the natural stone bridge “Puente de Piedra” or the route to the caves “Cova de Llevant” are perfect destinations in the pleasant 22-27°C.
In fact, the period from September to November is considered the best hiking season on the island, as the temperatures are no longer oppressive. Nevertheless, hikers should be well equipped – sturdy shoes, plenty of water and sun protection are essential, as there are hardly any places to stock up along the way.
Events and local festivals in September
On the first weekend in September, Ibiza Town transforms into a vibrant jazz metropolis. The Eivissa Jazz Festival presents national and international artists over four days, with many events free of charge, while the main concerts can be attended for around 12 Euro.
Also particularly impressive is the Medieval Sailors' Festival in San Antonio. From 26. to 29. September, this four-day spectacle offers a fascinating insight into the island's maritime tradition. With 110 market stalls, fire eaters, costumed pirates and live theatre performances, it is a highlight for families.
Culinary highlights of the low season
Ibiza's gastronomic scene shows itself from its best side in September. While many restaurants are open all year round, they offer a special treat in the low season: the “Menú del día” – a three-course menu at a fixed price, often including a drink.
Numerous culinary events enrich September – from tapas events to local wine festivals. Traditional paella tastes especially authentic in one of the beach restaurants, or a typical “Sofrit Pages” with chicken and lamb.
Visitors can also benefit from good discounts at the hippie markets in September, as many traders offer their goods at lower prices towards the end of the season.
Conclusion
In summary, Ibiza in September is a true paradise for late-summer holidaymakers. Average temperatures of around 25°C, combined with up to 10 hours of sunshine per day and a water temperature of a glorious 25°C, create ideal conditions for a relaxing beach holiday. In fact, the weather Ibiza September offers the perfect balance – the oppressive heat of midsummer is over, yet it remains pleasantly warm for all outdoor activities.
Particularly noteworthy is the significantly lower influx of tourists after the main season. The beaches are less crowded, accommodation prices drop noticeably, and the island gradually returns to its original, relaxed rhythm. While the nights become somewhat cooler at around 19-20°C, they also ensure a more restful sleep than in the hot summer months.
In addition, the mild climate in September opens up numerous opportunities to explore the island away from the tourist trails. The cooler temperatures make hikes through Ibiza's diverse natural landscape a pleasure, while local festivals such as the Eivissa Jazz Festival or the Medieval Sailors' Festival offer authentic insights into the island's culture.
Although the likelihood of rain increases slightly to 3-5 days per month, most of September remains sunny and dry. After occasional brief showers, the island even appears in a particularly fresh green – a sight that is rare in the dry summer months.
Ultimately, September is undoubtedly considered an insider tip and the best time to travel for a visit to Ibiza. The combination of pleasant temperatures, warm seawater and a relaxed atmosphere makes this month the ideal time to enjoy the Balearic island in all its splendour – without the drawbacks of the overcrowded high season.