Climate averages 1991–2020
Bilbao weather
in September.
A mild, moderately wet month: the 3rd warmest and the 3rd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Bilbao: daytime highs average 21.5°C and nights cool to about 15.9°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 65 mm of rain on roughly 12 days, which makes September a moderately wet month (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 33 min on an average September day.
The nearest other city in this atlas is Barakaldo (6 km away). In September its highs average 21.7°C, about as warm as Bilbao, with 65 mm of rain.
Among the 93 cities listed in Spain, Bilbao ranks joint 87th of 93 for the warmest September highs and joint 71st of 93 for the driest September (rainfall, lowest first). The mean September high of those 93 cities is 25.5°C; Bilbao is 4.0°C cooler than that mean.
From September to October, average highs fall by 2.4°C to 19.1°C, and monthly rainfall rises from 65 mm to 97 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Bilbao climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 11.9°C7.2°C | 7.2°C | 112 | 14.8 | 9.49 h |
| February | 12.1°C6.9°C | 6.9°C | 101 | 13.8 | 10.510 h |
| March | 14.0°C8.2°C | 8.2°C | 98 | 13.5 | 11.912 h |
| April | 15.1°C9.5°C | 9.5°C | 97 | 15.2 | 13.413 h |
| May | 17.8°C12.1°C | 12.1°C | 84 | 14.2 | 14.715 h |
| June | 20.3°C14.9°C | 14.9°C | 69 | 11.4 | 15.315 h |
| July | 22.3°C16.9°C | 16.9°C | 60 | 10.4 | 15.015 h |
| August | 23.2°C17.6°C | 17.6°C | 55 | 10.3 | 14.014 h |
| September, selected | 21.5°C15.9°C | 15.9°C | 65 | 11.8 | 12.513 h |
| October | 19.1°C13.7°C | 13.7°C | 97 | 13.9 | 11.111 h |
| November | 14.8°C10.2°C | 10.2°C | 135 | 15.6 | 9.810 h |
| December | 12.6°C8.1°C | 8.1°C | 105 | 14.4 | 9.09 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Barakaldo in SeptemberSpain · 6 kmHigh 21.7°C · Low 15.7°C · 65 mm rain
- Gasteiz / Vitoria in SeptemberSpain · 50 kmHigh 21.9°C · Low 12.2°C · 43 mm rain
- Santander in SeptemberSpain · 75 kmHigh 22.6°C · Low 15.3°C · 78 mm rain
- Donostia / San Sebastián in SeptemberSpain · 77 kmHigh 21.4°C · Low 15.6°C · 96 mm rain
- Logroño in SeptemberSpain · 97 kmHigh 23.3°C · Low 12.9°C · 32 mm rain
- Pamplona in SeptemberSpain · 115 kmHigh 22.2°C · Low 12.7°C · 50 mm rain
- Burgos in SeptemberSpain · 120 kmHigh 22.0°C · Low 11.0°C · 39 mm rain
- Palencia in SeptemberSpain · 191 kmHigh 24.0°C · Low 11.9°C · 29 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Bilbao) is explained once on the Bilbao year overview and on the Sources, method and limits page.
Barakaldo lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.