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Weather in September in Walla Walla, Washington

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< September >
 
Normal Max/ High Temperature 26°C (79°F)
 
Average Temperature 19°C (66°F)
 
Min/ Low Temperature 12°C (54°F)
 
Normal Precipitation 20mm (0.8in)
Number of Wet Days (probability of rain on a day) 5 (17%)
Average Sunlight per day 09:30
Average Daylight per day 12:29
Sunny (Cloudy) Daylight Hours 77% (23%)
Sun altitude at solar noon on the 21st day.
44.5°


  • The average temperature in Walla Walla, Washington in September is somewhat warm at 19 °C (66.2 °F).
  • Afternoons can be hot with average high temperatures reaching 26 °C (78.8 °F).
  • Overnight temperatures are generally quite mild with an average low of 12 °C (53.6 °F).
  • In September the mean daily temperature range/ variation is 14 °C (25.2 °F).
  • The weather in September is somewhat parched with occasional rain. A paltry 20mm (0.8in) of fluid accrues across on average 5 days.
  • In September the heavens above Walla Walla, Washington are nice and sunny with an average of a considerable 9:30 of radiant sunlight daily.
  • The shortest day is 11:41 long and the longest day is 13:17 long with an average length of 12:29.
  • There are approximately 2:47 per day when bright sunshine is absent due to cloud, haze or the sun being too low on the horizon to register.
  • It is sunny approximately 77.4% of daylight hours and cloudy 22.6% of daylight hours.

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Weather Trend Graph for September in Walla Walla, Washington, Usa

Graph of weather in Walla Walla, Washington in September

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