Bellingham weather in September 2025

Expect daytime maximum temperatures of 66°F in Bellingham, Washington State in September based on long-term weather averages. There are 6 hours of sunshine per day on average with 10 days with some rainfall and typically 2.6 inches of rainfall in the month.

  • 66°F maximum daytime temperature in September in Bellingham66
    66°F max day temperature
  • 6 hours of sunshine per day
  • 10 days with some rainfall in September in Bellingham10
    10 days with some rainfall
  • 48°F minimum night-time temperature in September in Bellingham48
    48°F min night temperature
  • 13 hours of daylight per day in September in Bellingham13
    13 hours of daylight per day
  • No heat & humidity in September in Bellingham0
    No heat & humidity
  • 2.6 inches monthly rainfall in September in Bellingham2.6
    2.6 inches of monthly rainfall
  • UV (maximum) index 5 (Moderate) in September in Bellingham5
    5 (Moderate) UV index
  • 54°F sea temperature in September in Bellingham54
    54°F sea temperature

More about Bellingham

Bellingham by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for Washington State

Cosmos: up to £600 savings on 2025 tours

  • Save up to £600 per couple on worldwide tours in 2025
  • Book tours to Europe, Asia, Africa, Americas & beyond
  • Travel before 31st December 2025 (inclusive)
Go to Cosmos deal >>

Expires at 23:59 on Monday 31st Mar 2025 · View all Cosmos offers

The September weather guide for Washington State (Bellingham) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C)  |  Imperial (°F)

Back to top

More about the USA

How hot is it in Bellingham in September?

Daytime temperatures usually reach 66°F in Bellingham in September, falling to 48°F at night.

How sunny is it in Bellingham in September?

There are normally 6 hours of bright sunshine each day in Bellingham in September - that's 49% of daylight hours.

How warm is the sea around Bellingham in September?

The average sea temperature around Bellingham in September is 54°F.

Does it rain in Bellingham in September?

There are usually 10 days with some rain in Bellingham in September and the average monthly rainfall is 2.6 inches.

Bellingham September sunrise & sunset times

Browse the sunrise and sunset times for Bellingham in September 2025. Select a month to view Bellingham sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:27 18:51
Monday, 15th September 2025 05:47 18:22
Tuesday, 30th September 2025 06:09 17:50

Related posts

Popular travel offers

Explore holidays in the sun for less

More holidays

Airport parking

More parking

Airport lounges

More lounges

Top ^