Olympia weather in September 2025

Expect daytime maximum temperatures of 22°C in Olympia, Washington State in September based on long-term weather averages. There are 7 hours of sunshine per day on average with typically 58 mm of rainfall in the month.

  • 22°C maximum daytime temperature in September in Olympia22
    22°C max day temperature
  • 7 hours of sunshine per day
  • 9 days with some rainfall in September in Olympia9
    9 days with some rainfall
  • 8°C minimum night-time temperature in September in Olympia8
    8°C min night temperature
  • 13 hours of daylight per day in September in Olympia13
    13 hours of daylight per day
  • No heat & humidity in September in Olympia0
    No heat & humidity
  • 58 mm monthly rainfall in September in Olympia58
    58 mm of monthly rainfall
  • UV (maximum) index 5 (Moderate) in September in Olympia5
    5 (Moderate) UV index

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The September weather guide for Washington State (Olympia) 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 / mm)  |  Imperial (°F / inches)

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How hot is it in Olympia in September?

Daytime temperatures usually reach 22°C in Olympia in September, falling to 8°C at night.

How sunny is it in Olympia in September?

There are normally 7 hours of bright sunshine each day in Olympia in September - that's 58% of daylight hours.

Does it rain in Olympia in September?

There are usually 9 days with some rain in Olympia in September and the average monthly rainfall is 58mm.

Olympia September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:31 18:50
Monday, 15th September 2025 05:50 18:22
Tuesday, 30th September 2025 06:10 17:52

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