Month by month
| Month | Afternoon | Sea | Rain | Verdict |
|---|---|---|---|---|
| January | 12.3 °C | 13.5 °C | 15 days | Possible, with trade-offs |
| February | 14 °C | 12.9 °C | 14 days | Possible, with trade-offs |
| March | 15.5 °C | 12.9 °C | 17 days | Possible, with trade-offs |
| April | 17.4 °C | 13.9 °C | 14 days | Possible, with trade-offs |
| May | 19.9 °C | 15.8 °C | 14 days | Possible, with trade-offs |
| June | 22.8 °C | 18.9 °C | 13 days | Pleasant — a good time to go |
| July | 24.8 °C | 21.3 °C | 10 days | Ideal — one of the best times of year |
| August | 25.7 °C | 22.3 °C | 10 days | Ideal — one of the best times of year |
| September | 23.8 °C | 21.2 °C | 12 days | Pleasant — a good time to go |
| October | 21.1 °C | 18.6 °C | 13 days | Pleasant — a good time to go |
| November | 16.1 °C | 16.3 °C | 16 days | Possible, with trade-offs |
| December | 14.3 °C | 14.5 °C | 14 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 Bilbao in August?
The sea averages 22.3°C in August — swimming is possible but brisk.
How hot is Bilbao in August?
Expect 25.7°C in the afternoon and 17.1°C at night, averaged over the last 10 years.
Does it rain a lot in Bilbao in August?
Around 10 days with rain (≥ 1 mm) in the month — 31% of days.