Click on a day for an hourly weather forecast
The temperatures in Bilbao in September are comfortable with low of 16°C and and high up to 23°C.
You can expect about 3 to 8 days of rain in Bilbao during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Bilbao in September 2025.
If you’re planning to visit Bilbao in the near future, we highly recommend that you review the 14 day weather forecast for Bilbao before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 12° / 6° | 9 | 21 | 1 | 174 mm | Bad | Bilbao in January |
| February | 12° / 6° | 8 | 19 | 1 | 160 mm | Bad | Bilbao in February |
| March | 14° / 7° | 7 | 24 | 0 | 109 mm | Ok | Bilbao in March |
| April | 16° / 9° | 7 | 23 | 0 | 103 mm | Ok | Bilbao in April |
| May | 18° / 11° | 7 | 24 | 0 | 97 mm | Ok | Bilbao in May |
| June | 21° / 13° | 6 | 24 | 0 | 112 mm | Good | Bilbao in June |
| July | 23° / 16° | 4 | 27 | 0 | 70 mm | Perfect | Bilbao in July |
| August | 24° / 17° | 4 | 27 | 0 | 65 mm | Perfect | Bilbao in August |
| September | 23° / 16° | 3 | 27 | 0 | 70 mm | Perfect | Bilbao in September |
| October | 20° / 13° | 5 | 26 | 0 | 95 mm | Good | Bilbao in October |
| November | 15° / 10° | 9 | 21 | 0 | 189 mm | Ok | Bilbao in November |
| December | 13° / 8° | 8 | 23 | 0 | 136 mm | Bad | Bilbao in December |