Climate averages 1991–2020
Bilbao weather
in August.
A warm, moderately wet month: the warmest and the driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a warm month in Bilbao: daytime highs average 23.2°C and nights cool to about 17.6°C. By daytime temperature it is the warmest month of the year.
Expect about 55 mm of rain on roughly 10 days, which makes August a moderately wet month (the driest month of the year). Daylight, from sunrise to sunset, lasts about 13 h 57 min on an average August day.
The nearest other city in this atlas is Barakaldo (6 km away). In August its highs average 23.4°C, about as warm as Bilbao, with 55 mm of rain.
Among the 93 cities listed in Spain, Bilbao ranks 89th of 93 for the warmest August highs and joint 85th of 93 for the driest August (rainfall, lowest first). The mean August high of those 93 cities is 29.3°C; Bilbao is 6.1°C cooler than that mean.
From August to September, average highs fall by 1.7°C to 21.5°C, and monthly rainfall rises from 55 mm to 65 mm.
The annual picture
August 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, selected | 23.2°C17.6°C | 17.6°C | 55 | 10.3 | 14.014 h |
| September | 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
August in nearby cities
- Barakaldo in AugustSpain · 6 kmHigh 23.4°C · Low 17.5°C · 55 mm rain
- Gasteiz / Vitoria in AugustSpain · 50 kmHigh 25.1°C · Low 14.5°C · 32 mm rain
- Santander in AugustSpain · 75 kmHigh 24.4°C · Low 17.1°C · 60 mm rain
- Donostia / San Sebastián in AugustSpain · 77 kmHigh 23.3°C · Low 17.4°C · 89 mm rain
- Logroño in AugustSpain · 97 kmHigh 26.9°C · Low 15.4°C · 26 mm rain
- Pamplona in AugustSpain · 115 kmHigh 25.9°C · Low 15.3°C · 42 mm rain
- Burgos in AugustSpain · 120 kmHigh 26.2°C · Low 13.7°C · 20 mm rain
- Palencia in AugustSpain · 191 kmHigh 28.6°C · Low 14.8°C · 14 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.