The highest day temperature in May 2025 was 89°F. The lowest night temperature was 43°F. The average values for day and night temperatures during May were 66.8°F и 51.6°F respectivly.

The average sea surface temperature in May 2025 for Bilbao was 61.5°F. The maximum and minimum values were 59.4°F and 64.6°F respectively.

You can expect various weather conditions during May. Be ready for sunny, cloudy or even gloomy days.

Precipitation total in May for Bilbao is 2.3 in.

The average wind speed in May is 6.3 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 May is 8.1 hours.