Diablo Lake weather in September 2025

Expect 16°C daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in Diablo Lake in September. Check more long-term weather averages for Diablo Lake in September before you book your next holiday to Washington State in 2025/2026.

  • 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 warm is it in Diablo Lake in September?

Daytime temperatures usually reach 16°C in Diablo Lake in September, falling to 4°C at night.

How sunny is it in Diablo Lake in September?

There are normally 6 hours of bright sunshine each day in Diablo Lake in September - that's 51% of daylight hours.

Does it rain in Diablo Lake in September?

There are usually 11 days with some rain in Diablo Lake in September and the average monthly rainfall is 64mm.

Diablo Lake September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:22 18:46
Monday, 15th September 2025 05:42 18:16
Tuesday, 30th September 2025 06:03 17:45

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