Walla Walla weather in September 2025

Expect 25°C daytime maximum temperatures in the shade with on average 9 hours of sunshine per day in Walla Walla in September. Check more long-term weather averages for Walla Walla in September before you book your next holiday to Washington State in 2025/2026.

  • 25°C maximum daytime temperature in September in Walla Walla25
    25°C max day temperature
  • 9 hours of sunshine per day
  • 5 days with some rainfall in September in Walla Walla5
    5 days with some rainfall
  • 10°C minimum night-time temperature in September in Walla Walla10
    10°C min night temperature
  • 12 hours of daylight per day in September in Walla Walla12
    12 hours of daylight per day
  • No heat & humidity in September in Walla Walla0
    No heat & humidity
  • 24 mm monthly rainfall in September in Walla Walla24
    24 mm of monthly rainfall
  • UV (maximum) index 5 (Moderate) in September in Walla Walla5
    5 (Moderate) UV index

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The September weather guide for Washington State (Walla Walla) 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 Walla Walla in September?

Daytime temperatures usually reach 25°C in Walla Walla in September with no heat and humidity, falling to 10°C at night.

How sunny is it in Walla Walla in September?

There are normally 9 hours of bright sunshine each day in Walla Walla in September - that's 71% of daylight hours.

Does it rain in Walla Walla in September?

There are usually 5 days with some rain in Walla Walla in September and the average monthly rainfall is 24mm.

Walla Walla September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:14 18:31
Monday, 15th September 2025 05:32 18:04
Tuesday, 30th September 2025 05:51 17:34

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