Your September weather guide
HotWeather in Ibiza in September
Yes - September suits a trip to Ibiza if you want hot days and a warm sea, but can accept some rain. Average daytime highs are around 27°C, nights stay near 21°C and the sea is about 25°C. That makes swimming and evenings outdoors realistic priorities, rather than hopeful extras. The catch is that neither dry weather nor gentler heat is guaranteed, so leave some flexibility in your plans.
Long-term climate averages for Ibiza Town, not a forecast · 1991-2020
Ibiza, month by month
Your snapshot
At a glance
The useful details for Ibiza Town.
- Average daytime high
- 27.3°C
- 9 in 10 days stay below 30°C
- Average night-time low
- 21.3°C
- coldest 10% of nights: 19°C or lower
- Compared with London
- +8.7°C
- London averages 18.6°C in September
- Sea temperature
- 25.2°C
- year to year: 24°C to 26°C
- Sunshine per day (est.)
- 7.6h
- 62% of 12.2 h of daylight
- Rainy days (1 mm+)
- 5
- 43 mm over the month
- Humidity
- 67%
- Days over 25°C
- 81%
- 14% over 30°C
- Record high 1991-2020
- 34.8°C
- 2016-09-05
- Record low 1991-2020
- 15.4°C
- 1993-09-29
- Flight from London
- ≈ 2 h 30 min
- 1367 km, short-haul (estimate for a direct flight)
Records are observed extremes within 1991-2020, not typical holiday conditions. Warm-day percentages are shares of days, not day counts.
How September compares
September is the 4th warmest month of the year in Ibiza and ranks 62nd of 134 destinations we compare for September - see where else is hot in September. Within Spain it is 9th of 87 (Spain in September). Against London's average high of 18.6°C in September, Ibiza is 8.7°C warmer by day and 10.1°C warmer at night.
Daytime and night-time in September
The typical September day in Ibiza peaks at 27.3°C, but that is an average: the warmest 10% of days reach 30.4°C or more. About 81% of days top 25°C and 1 in 7 pass 30°C. Nights average 21.3°C; one night in ten drops to 18.9°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest September day here reached 34.8°C (2016-09-05) and the coldest night 15.4°C (1993-09-29).
Rain in September
Some rain (4-8 rainy days): about 5 days with 1 mm or more, 43 mm in total. Year to year it varies a lot - the wettest September was 1996 with 186 mm, the driest 1998 with 4 mm. Humidity averages 67%.
Sea temperature in September
The sea averages 25.2°C - warm enough to swim (22°c+). Depending on the year it ranges from 24.0°C to 26.0°C. For the warmest sea here, come in August (26.5°C).
Sunshine and daylight
Around 7.6 hours of sunshine a day (estimated from cloud cover), 12.2 hours of daylight: the sun rises about 07:36 and sets about 20:03 local time in mid-September. Average cloud cover is 38%.
Is September a good time to visit Ibiza?
Yes - it is one of the better months: hot days, manageable rain and long sunny days. The best months for Ibiza on our scoring are July, June, August; months averaging 25°C or more: Jun, Jul, Aug, Sep.
Summer clothing, with room for hotter days
Expect to dress for heat rather than autumn during the day: 81% of days reach 25°C. Lightweight clothes, a hat and sun protection make sense, with a slower pace around midday if you find heat tiring. September is not reliably free of hotter spells either, as 14% of days reach 30°C. Evenings are generally warm enough for light clothing, though a light layer is sensible for sitting outdoors late. The coldest 10% of nights fall to around 19°C or below. It suits travellers who still want summer warmth, but is less convincing if avoiding heat is your main reason for travelling in September.
Good swimming weather, but keep plans flexible
The sea is a strong reason to choose September. At an average of 25.2°C, it falls comfortably in the swimming category, with a year-to-year range of 24°C to 26°C. If cold water usually puts you off, these temperatures make swimming a more appealing prospect. Rain is the compromise: expect about 5 rainy days across the month, so do not build your whole trip around uninterrupted dry weather. That does not tell you how long each shower or wet spell will last. Keep swimming plans flexible and pack a light waterproof rather than assuming every day will suit time by the water.
A little perspective
Ibiza through the year
September is highlighted. See how it compares with the rest of the year.
| Month | Day | Night | Sea | Sun/day | Rain mm | Rainy days | Days 25°C+ |
|---|---|---|---|---|---|---|---|
| January | 14.8°C | 10.0°C | 14.8°C | 5.4 | 32 | 6 | 0% |
| February | 15.1°C | 9.9°C | 14.2°C | 6.2 | 25 | 5 | 0% |
| March | 17.5°C | 11.3°C | 14.6°C | 7.0 | 22 | 4 | 0% |
| April | 19.8°C | 13.1°C | 15.8°C | 7.7 | 27 | 5 | 1% |
| May | 23.4°C | 15.9°C | 18.4°C | 8.6 | 20 | 3 | 29% |
| Junebest | 27.7°C | 19.6°C | 22.1°C | 11.0 | 8 | 2 | 83% |
| Julybest | 30.6°C | 22.5°C | 25.2°C | 12.3 | 3 | 1 | 100% |
| Augustbest | 30.9°C | 23.4°C | 26.5°C | 10.6 | 14 | 2 | 99% |
| SeptemberSelected | 27.3°C | 21.3°C | 25.2°C | 7.6 | 43 | 5 | 81% |
| October | 23.3°C | 18.0°C | 22.5°C | 6.1 | 44 | 6 | 28% |
| November | 18.5°C | 14.0°C | 19.2°C | 5.3 | 47 | 7 | 0% |
| December | 15.7°C | 11.3°C | 16.4°C | 5.1 | 35 | 6 | 0% |
Day = average daytime high, night = average night-time low, 1991-2020.Sun is hours per day; rainy days count 1 mm or more.
Day, night and sea
Monthly average temperatures, 1991-2020
- Day
- Night
- Sea
Best months here
On warmth, low rainfall and sunshine, start with these.
Keep exploring
Similar in September
Closest matches on daytime temperature, sea temperature and sunshine, in other countries.
A little more detail
Ibiza in September FAQs
Plain answers, grounded in the averages.
Is Ibiza hot in September?
Ibiza is hot in September: the average daytime high is 27.3°C and nights average 21.3°C. About 81% of September days reach 25°C or more.
Can you swim in the sea in Ibiza in September?
The sea around Ibiza averages 25.2°C in September, which is warm enough for most people to swim comfortably. Between 1991 and 2020 it ranged from 24°C to 26°C depending on the year.
How much does it rain in Ibiza in September?
Ibiza sees about 5 rainy days (1 mm or more) and 43 mm of rain in a typical September. The wettest September between 1991 and 2020 was 1996 (186 mm) and the driest was 1998 (4 mm).
How sunny is Ibiza in September?
Ibiza gets around 7.6 hours of sunshine a day in September out of 12.2 hours of daylight (estimated from average cloud cover).
How does Ibiza compare with the UK in September?
Ibiza is on average 8.7°C warmer than London by day in September (27.3°C against 18.6°C).
What is the hottest September on record in Ibiza?
Between 1991 and 2020 the hottest September day in Ibiza reached 34.8°C on 2016-09-05, and the coldest night dropped to 15.4°C on 1993-09-29.
How much warmer is Ibiza than London in September?
Ibiza's average daytime high is 27.3°C, compared with 18.6°C in London - a difference of 8.7°C. That is a substantial step up in warmth, so pack mainly for hot days rather than copying your September wardrobe at home.
Will it be sunny all day?
Do not count on continuous sunshine. September averages about 7.6 hours of sunshine within 12.2 hours of daylight. There is plenty of scope for time outdoors, but the sunshine figure is an average, not a promise for each day.
About these averages
ERA5-Land climate reanalysis via Open-Meteo (11 km grid) and NOAA Coral Reef Watch 5 km sea temperatures, 1991-2020
Averages computed from daily values at Ibiza (Ibiza Town). Sea temperature from the nearest 5 km sea cell, 3.8 km from that point. Sunshine hours are estimated from average cloud cover.Records are the highest and lowest daily values in that 30-year period, not all-time records. These are climate averages, not a forecast for your trip. How we measure holiday weather
- Hot · 25°C+
- Warm · 20°C to below 25°C
- Mild · 15°C to below 20°C
- Cool · below 15°C