Your September weather guide
WarmWeather in Costa Brava in September
September is a good choice for Costa Brava if you want warm days and a swimmable sea, but can accept some rain. Daytime highs average around 25°C, the sea is around 23°C and there are about 11 rainy days across the month. For a UK traveller, that makes it a reasonable choice for swimming and spending time outdoors without relying on intense heat. The catch is that you should plan for wet weather rather than expect uninterrupted sunshine.
Long-term climate averages for Lloret de Mar, not a forecast · 1991-2020
Costa Brava, month by month
Your snapshot
At a glance
The useful details for Lloret de Mar.
- Average daytime high
- 24.7°C
- 9 in 10 days stay below 28°C
- Average night-time low
- 16.9°C
- coldest 10% of nights: 14°C or lower
- Compared with London
- +6.1°C
- London averages 18.6°C in September
- Sea temperature
- 23.3°C
- year to year: 22°C to 24°C
- Sunshine per day (est.)
- 6.0h
- 49% of 12.3 h of daylight
- Rainy days (1 mm+)
- 11
- 85 mm over the month
- Humidity
- 75%
- Days over 25°C
- 48%
- 3% over 30°C
- Record high 1991-2020
- 33.1°C
- 2016-09-04
- Record low 1991-2020
- 8.6°C
- 2007-09-28
- Flight from London
- ≈ 2 h 6 min
- 1076 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 Costa Brava. Within Spain it is 70th of 87 (Spain in September). Against London's average high of 18.6°C in September, Costa Brava is 6.1°C warmer by day and 5.7°C warmer at night.
Daytime and night-time in September
The typical September day in Costa Brava peaks at 24.7°C, but that is an average: the warmest 10% of days reach 28.4°C or more. Roughly 1 in 2 days top 25°C and 1 in 40 pass 30°C. Nights average 16.9°C; one night in ten drops to 13.6°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest September day here reached 33.1°C (2016-09-04) and the coldest night 8.6°C (2007-09-28).
Rain in September
Wet (more than 8 rainy days): about 11 days with 1 mm or more, 85 mm in total. Year to year it varies a lot - the wettest September was 1994 with 175 mm, the driest 1997 with 23 mm. Humidity averages 75%.
Sea temperature in September
The sea averages 23.3°C - warm enough to swim (22°c+). Depending on the year it ranges from 22.2°C to 24.2°C. For the warmest sea here, come in August (24.8°C).
Sunshine and daylight
Around 6.0 hours of sunshine a day (estimated from cloud cover), 12.3 hours of daylight: the sun rises about 07:29 and sets about 19:59 local time in mid-September. Average cloud cover is 51%.
Is September a good time to visit Costa Brava?
It is a reasonable choice: warm days but expect showers. The best months for Costa Brava on our scoring are July, June, August; months averaging 25°C or more: Jun, Jul, Aug.
Warm enough for swimming, cooler after dark
The warmth suits travellers who want to spend time outside without making very hot weather the focus of the holiday. Light clothes make sense during the day, with shade useful around midday when it feels warmer. The sea averages 23.3°C, making swimming a reasonable part of your plans rather than something reserved for particularly hot afternoons. Evenings call for a different approach: night-time lows average around 17°C, while the coldest nights can fall to around 14°C or below. Pack a jumper or light jacket for sitting outside after dark. September suits a mix of swimming and relaxed outdoor time, provided you are happy to add a layer later.
Leave room in your plans for rain
Rain is the main compromise, so September is less suitable if your holiday depends on being outside every day. About 11 days have measurable rain, which is enough to make a light waterproof and flexible plans sensible. Sunshine averages about 6.0 hours out of 12.3 hours of daylight: there is useful time for outdoor plans, but daylight should not be mistaken for sunshine. Avoid committing every day to activities that need dry weather, and use the local forecast to choose your swimming time. If warmth and sea swimming matter more than consistently dry conditions, the balance can still work well; if rain would spoil the trip, the month is a less convincing fit.
A little perspective
Costa Brava 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 | 12.5°C | 4.5°C | 13.4°C | 4.7 | 51 | 7 | 0% |
| February | 13.3°C | 4.8°C | 12.8°C | 5.2 | 45 | 7 | 0% |
| March | 15.9°C | 7.0°C | 13.0°C | 5.7 | 57 | 8 | 0% |
| April | 18.0°C | 9.2°C | 14.0°C | 6.2 | 73 | 10 | 1% |
| May | 21.6°C | 12.7°C | 16.6°C | 6.8 | 64 | 10 | 13% |
| Junebest | 25.8°C | 16.7°C | 20.3°C | 8.5 | 47 | 7 | 59% |
| Julybest | 28.5°C | 19.6°C | 23.4°C | 9.7 | 38 | 6 | 87% |
| Augustbest | 28.7°C | 20.0°C | 24.8°C | 8.3 | 51 | 8 | 89% |
| SeptemberSelected | 24.7°C | 16.9°C | 23.3°C | 6.0 | 85 | 11 | 48% |
| October | 20.7°C | 13.6°C | 20.1°C | 4.6 | 99 | 10 | 7% |
| November | 16.0°C | 8.8°C | 17.0°C | 4.5 | 69 | 8 | 0% |
| December | 13.1°C | 5.5°C | 14.7°C | 4.4 | 51 | 7 | 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
Costa Brava in September FAQs
Plain answers, grounded in the averages.
Is Costa Brava hot in September?
Costa Brava is warm in September: the average daytime high is 24.7°C and nights average 16.9°C. Roughly 1 in 2 September days reach 25°C.
Can you swim in the sea in Costa Brava in September?
The sea around Costa Brava averages 23.3°C in September, which is warm enough for most people to swim comfortably. Between 1991 and 2020 it ranged from 22°C to 24°C depending on the year.
How much does it rain in Costa Brava in September?
Costa Brava sees about 11 rainy days (1 mm or more) and 85 mm of rain in a typical September. The wettest September between 1991 and 2020 was 1994 (175 mm) and the driest was 1997 (23 mm).
How sunny is Costa Brava in September?
Costa Brava gets around 6.0 hours of sunshine a day in September out of 12.3 hours of daylight (estimated from average cloud cover).
How does Costa Brava compare with the UK in September?
Costa Brava is on average 6.1°C warmer than London by day in September (24.7°C against 18.6°C).
What is the hottest September on record in Costa Brava?
Between 1991 and 2020 the hottest September day in Costa Brava reached 33.1°C on 2016-09-04, and the coldest night dropped to 8.6°C on 2007-09-28.
How much warmer is Costa Brava than London in September?
Costa Brava's average daytime high is 24.7°C, compared with 18.6°C in London - a difference of 6.1°C. That is a noticeable step up in daytime warmth, though it does not remove the need for an evening layer or waterproof.
Is September likely to be very hot?
Warm is a better expectation than very hot. Around 48% of days reach 25°C, while only 2% reach 30°C. Hotter spells are possible, but September is better suited to travellers seeking moderate warmth than those counting on strong heat.
How long is the flight from London?
The flight from London is about 2 h 6 min, making this a short-haul option for warmer September weather. That is flight time rather than the whole journey, so allow separately for airport time and onward travel.
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 Lloret de Mar. Sea temperature from the nearest 5 km sea cell, 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