Walla Walla weather in September 2025

Expect 77°F 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.

  • 77°F maximum daytime temperature in September in Walla Walla77
    77°F max day temperature
  • 9 hours of sunshine per day
  • 5 days with some rainfall in September in Walla Walla5
    5 days with some rainfall
  • 50°F minimum night-time temperature in September in Walla Walla50
    50°F 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
  • 0.9 inches monthly rainfall in September in Walla Walla0.9
    0.9 inches of monthly rainfall
  • UV (maximum) index 5 (Moderate) in September in Walla Walla5
    5 (Moderate) UV index

More about Walla Walla

Walla Walla by month

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

Recommended for Washington State

Avalon Waterways: Top deals on 2025 river cruises

  • Book early & save on 2025 river cruises with Avalon Waterways
  • Filter deals by promotion, month, destination & more
  • Travel between 1st Jan & 31st Dec 2025 (inclusive)
Go to Avalon Waterways deal >>

Expires at 23:59 on Wednesday 31st Dec 2025 · View all Avalon Waterways offers

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)  |  Imperial (°F)

Back to top

More about the USA

How hot is it in Walla Walla in September?

Daytime temperatures usually reach 77°F in Walla Walla in September with no heat and humidity, falling to 50°F 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 0.9 inches.

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

Related posts

Popular travel offers

Explore holidays in the sun for less

More holidays

Airport parking

More parking

Airport lounges

More lounges

Top ^