The highest day temperature in August 2026 was 90°F. The lowest night temperature was 38°F. The average values for day and night temperatures during August were 79.0°F и 65.0°F respectivly.

The average sea surface temperature in August 2026 for Bilbao was 76.4°F. The maximum and minimum values were 73.6°F and 78.0°F respectively.

Most of the days in August are sunny but you can also expect cloudy and gloomy days.

Precipitation total in August for Bilbao is 1.3 in. It makes august one of the least rainy months of the year.

The average wind speed in August is 5.4 mph. This value is relatively stable throughout the year.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Bilbao in August is 8.9 hours.