Month by month
| Month | Afternoon | Sea | Rain | Verdict |
|---|---|---|---|---|
| January | 13.5 °C | 14.3 °C | 4 days | Possible, with trade-offs |
| February | 14.7 °C | 13.6 °C | 6 days | Possible, with trade-offs |
| March | 16.2 °C | 13.9 °C | 7 days | Possible, with trade-offs |
| April | 17.8 °C | 15.2 °C | 8 days | Possible, with trade-offs |
| May | 21.4 °C | 18 °C | 7 days | Pleasant — a good time to go |
| June | 25.9 °C | 22.3 °C | 6 days | Ideal — one of the best times of year |
| July | 28.7 °C | 25.5 °C | 4 days | Ideal — one of the best times of year |
| August | 28.5 °C | 26.6 °C | 7 days | Ideal — one of the best times of year |
| September | 25 °C | 25.1 °C | 12 days | Ideal — one of the best times of year |
| October | 21.7 °C | 22.3 °C | 9 days | Pleasant — a good time to go |
| November | 17.4 °C | 18.6 °C | 8 days | Possible, with trade-offs |
| December | 15 °C | 15.8 °C | 4 days | Possible, with trade-offs |
Before you go
Three things to check once you have picked your dates.
Entry
Spain is in the European Union. Entry rules depend on your nationality — check before booking.
Safety
No specific restrictions
Usual precautions apply.
Official advice updated 12 August 2026
Health
Recommended vaccinations, water quality, mosquitoes: advice depends on the country and the season. Some vaccines need time before departure.
Beau Fixe is not a safety or health authority. These notes summarise public advisories and link to their source; only the competent authorities are authoritative. Alert levels: Foreign, Commonwealth & Development Office (gov.uk), Open Government Licence v3.0.
FAQ
Can you swim in Barcelone in September?
The sea averages 25.1°C in September — yes, pleasant swimming.
How hot is Barcelone in September?
Expect 25°C in the afternoon and 18.2°C at night, averaged over the last 10 years.
Does it rain a lot in Barcelone in September?
Around 12 days with rain (≥ 1 mm) in the month — 39% of days.