The highest day temperature in May 2026 was 80°F. The lowest night temperature was 44°F. The average values for day and night temperatures during May were 65.7°F и 51.7°F respectivly.

The average sea surface temperature in May 2026 for Bellingham was 55.2°F. The maximum and minimum values were 52.4°F and 57.4°F respectively.

Most of the days in May are gloomy but you can also expect sunny days.

Precipitation total in May for Bellingham is 1.1 in.

The average wind speed in May is 4.6 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 Bellingham in May is 7.7 hours.