Diablo Lake weather in September 2026

Expect daytime maximum temperatures of 16°C in Diablo Lake, Washington State in September based on long-term weather averages. There are 6 hours of sunshine per day on average with 11 days with some rainfall and typically 64 mm of rainfall in the month.

  • 16°C maximum daytime temperature in September in Diablo Lake16
    16°C max day temperature
  • 6 hours of sunshine per day
  • 11 days with some rainfall in September in Diablo Lake11
    11 days with some rainfall
  • 4°C minimum night-time temperature in September in Diablo Lake4
    4°C min night temperature
  • 13 hours of daylight per day in September in Diablo Lake13
    13 hours of daylight per day
  • No heat & humidity in September in Diablo Lake0
    No heat & humidity
  • 64 mm monthly rainfall in September in Diablo Lake64
    64 mm of monthly rainfall
  • UV (maximum) index 5 (Moderate) in September in Diablo Lake5
    5 (Moderate) UV index

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The September weather guide for Washington State (Diablo Lake) 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 Diablo Lake in September?

Daytime temperatures usually reach 21°C in Diablo Lake in September, falling to 11°C at night.

How sunny is it in Diablo Lake in September?

There are normally 7 hours of bright sunshine each day in Diablo Lake in September - that's 57% of daylight hours.

Does it rain in Diablo Lake in September?

There are usually 9 days with some rain in Diablo Lake in September and the average monthly rainfall is 49mm.

Diablo Lake September sunrise & sunset times

Browse the sunrise and sunset times for Diablo Lake in September 2026. Select a month to view Diablo Lake sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Tuesday, 1st September 2026 05:22 18:46
Tuesday, 15th September 2026 05:41 18:17
Wednesday, 30th September 2026 06:03 17:45

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