Olympia weather in September 2025

Expect 72°F daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in Olympia in September. Check more long-term weather averages for Olympia in September before you book your next holiday to Washington State in 2025/2026.

  • 72°F maximum daytime temperature in September in Olympia72
    72°F max day temperature
  • 7 hours of sunshine per day
  • 9 days with some rainfall in September in Olympia9
    9 days with some rainfall
  • 46°F minimum night-time temperature in September in Olympia46
    46°F 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
  • 2.3 inches monthly rainfall in September in Olympia2.3
    2.3 inches 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)  |  Imperial (°F)

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How hot is it in Olympia in September?

Daytime temperatures usually reach 72°F in Olympia in September, falling to 46°F 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 2.3 inches.

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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