Your September weather guide
HotWeather in Alicante in September
September is a good choice for Alicante if you want hot days and a warm sea, but can accept some rain. Average afternoon highs are around 27°C, nights stay near 20°C, and the sea is about 25°C. For a UK traveller, that means summer clothing still makes sense, with a light layer and rain protection as backup. It suits swimming and time outdoors better than a trip where you need guaranteed dry weather.
Long-term climate averages for Alicante, not a forecast · 1991-2020
Alicante, month by month
Your snapshot
At a glance
The useful details for Alicante.
- Average daytime high
- 26.8°C
- 9 in 10 days stay below 30°C
- Average night-time low
- 20.1°C
- coldest 10% of nights: 17°C or lower
- Compared with London
- +8.2°C
- London averages 18.6°C in September
- Sea temperature
- 24.9°C
- year to year: 24°C to 26°C
- Sunshine per day (est.)
- 7.1h
- 58% of 12.2 h of daylight
- Rainy days (1 mm+)
- 7
- 47 mm over the month
- Humidity
- 70%
- Days over 25°C
- 78%
- 8% over 30°C
- Record high 1991-2020
- 35.8°C
- 2016-09-05
- Record low 1991-2020
- 13.9°C
- 1995-09-26
- Flight from London
- ≈ 2 h 30 min
- 1424 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 3rd warmest month of the year in Alicante and ranks 68th of 134 destinations we compare for September - see where else is hot in September. Within Spain it is 18th of 87 (Spain in September). Against London's average high of 18.6°C in September, Alicante is 8.2°C warmer by day and 8.9°C warmer at night.
Daytime and night-time in September
The typical September day in Alicante peaks at 26.8°C, but that is an average: the warmest 10% of days reach 29.8°C or more. About 78% of days top 25°C and 1 in 12 pass 30°C. Nights average 20.1°C; one night in ten drops to 17.3°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest September day here reached 35.8°C (2016-09-05) and the coldest night 13.9°C (1995-09-26).
Rain in September
Some rain (4-8 rainy days): about 7 days with 1 mm or more, 47 mm in total. Year to year it varies a lot - the wettest September was 1996 with 165 mm, the driest 1992 with 4 mm. Humidity averages 70%.
Sea temperature in September
The sea averages 24.9°C - warm enough to swim (22°c+). Depending on the year it ranges from 23.5°C to 25.7°C. For the warmest sea here, come in August (26.5°C).
Sunshine and daylight
Around 7.1 hours of sunshine a day (estimated from cloud cover), 12.2 hours of daylight: the sun rises about 07:44 and sets about 20:11 local time in mid-September. Average cloud cover is 42%.
Is September a good time to visit Alicante?
Yes - it is one of the better months: hot days, manageable rain and long sunny days. The best months for Alicante on our scoring are July, June, August; months averaging 25°C or more: Jun, Jul, Aug, Sep.
Expect summer warmth, with some hotter afternoons
Pack mainly light clothing: 78% of days reach 25°C, so September is not reliably cool weather for walking around the city. Midday can still feel hot, particularly with humidity at 70%, making shade and a slower pace sensible. Days reaching 30°C account for 8%, so stronger heat is possible without being the usual experience. Evenings are generally warm enough for lighter clothes, though a thin jumper is useful if you feel the cold. The coolest nights can fall to around 17°C or lower. If you prefer being active without much heat, plan your longer walks away from the middle of the day rather than assuming September will feel mild.
Plenty of outdoor time, but keep plans flexible
The catch is rain: Alicante has about 7 rainy days in September, so a completely dry stay is not something to count on. A compact umbrella or light waterproof is a sensible addition, even if most of your packing is for warm weather. There is still about 7.1 hours of sunshine a day within 12.2 hours of daylight, giving you scope to spend time outside without treating every afternoon as certain beach weather. Keep swimming plans flexible and check the forecast before committing to a full day outdoors. This month suits travellers who can adjust their plans more than those whose whole trip depends on uninterrupted sunshine.
A little perspective
Alicante 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 | 15.2°C | 8.0°C | 14.6°C | 5.4 | 34 | 5 | 0% |
| February | 15.8°C | 8.3°C | 13.9°C | 6.0 | 29 | 5 | 0% |
| March | 17.9°C | 10.2°C | 14.4°C | 6.5 | 39 | 6 | 1% |
| April | 19.9°C | 12.2°C | 15.8°C | 7.1 | 45 | 7 | 2% |
| May | 22.8°C | 15.3°C | 18.5°C | 8.1 | 35 | 6 | 21% |
| Junebest | 26.7°C | 19.2°C | 22.2°C | 10.5 | 16 | 3 | 77% |
| Julybest | 29.3°C | 21.9°C | 25.3°C | 11.9 | 5 | 2 | 99% |
| Augustbest | 29.7°C | 22.6°C | 26.5°C | 10.0 | 14 | 3 | 99% |
| SeptemberSelected | 26.8°C | 20.1°C | 24.9°C | 7.1 | 47 | 7 | 78% |
| October | 23.2°C | 16.4°C | 22.0°C | 5.9 | 44 | 7 | 28% |
| November | 18.7°C | 12.0°C | 18.8°C | 5.3 | 42 | 6 | 2% |
| December | 15.9°C | 9.1°C | 16.2°C | 5.0 | 32 | 5 | 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
Alicante in September FAQs
Plain answers, grounded in the averages.
Is Alicante hot in September?
Alicante is hot in September: the average daytime high is 26.8°C and nights average 20.1°C. About 78% of September days reach 25°C or more.
Can you swim in the sea in Alicante in September?
The sea around Alicante averages 24.9°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 Alicante in September?
Alicante sees about 7 rainy days (1 mm or more) and 47 mm of rain in a typical September. The wettest September between 1991 and 2020 was 1996 (165 mm) and the driest was 1992 (4 mm).
How sunny is Alicante in September?
Alicante gets around 7.1 hours of sunshine a day in September out of 12.2 hours of daylight (estimated from average cloud cover).
How does Alicante compare with the UK in September?
Alicante is on average 8.2°C warmer than London by day in September (26.8°C against 18.6°C).
What is the hottest September on record in Alicante?
Between 1991 and 2020 the hottest September day in Alicante reached 35.8°C on 2016-09-05, and the coldest night dropped to 13.9°C on 1995-09-26.
Is the sea warm enough for swimming in September?
Yes. The sea averages 24.9°C, with a year-to-year range of 24°C to 26°C, so swimming is a strong reason to choose September. That is warm rather than bracing, though comfortable water does not guarantee calm conditions on any particular day.
How much warmer is Alicante than London in September?
Alicante's average daytime high is 26.8°C, compared with 18.6°C in London - a difference of 8.2°C. That is a substantial step up in warmth, so pack for hot afternoons rather than simply taking your usual UK September clothes.
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 Alicante. Sea temperature from the nearest 5 km sea cell, 2.3 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