The highest day temperature in September 2024 was 76°F. The lowest night temperature was 45°F. The average values for day and night temperatures during September were 63.3°F и 54.9°F respectivly.

The average sea surface temperature in September 2024 for Bellingham was 58.7°F. The maximum and minimum values were 55.2°F and 61.6°F respectively.

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

Precipitation total in September for Bellingham is 1.3 in. It makes september one of the least rainy months of the year.

The average wind speed in September is 3.4 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 Bellingham in September is 7.4 hours.