Seattle weather in December 2025

Expect daytime maximum temperatures of 8°C in Seattle in December based on long-term weather averages. There are 2 hours of sunshine per day on average with 18 days with some rainfall and typically 151 mm of rainfall in the month.

  • 8°C maximum daytime temperature in December in Seattle8
    8°C max day temperature
  • 2 hours of sunshine per day
  • 18 days with some rainfall in December in Seattle18
    18 days with some rainfall
  • 2°C minimum night-time temperature in December in Seattle2
    2°C min night temperature
  • 8 hours of daylight per day in December in Seattle8
    8 hours of daylight per day
  • No heat & humidity in December in Seattle0
    No heat & humidity
  • 151 mm monthly rainfall in December in Seattle151
    151 mm of monthly rainfall
  • UV (maximum) index 1 (Low) in December in Seattle1
    1 (Low) UV index

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The December weather guide for Washington State (Seattle) 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 Seattle in December?

Daytime temperatures usually reach 8°C in Seattle in December, falling to 2°C at night.

How sunny is it in Seattle in December?

There are normally 2 hours of bright sunshine each day in Seattle in December - that's 21% of daylight hours.

Does it rain in Seattle in December?

There are usually 18 days with some rain in Seattle in December and the average monthly rainfall is 151mm.

Seattle December sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st December 2025 07:37 16:20
Tuesday, 16th December 2025 07:52 16:18
Wednesday, 31st December 2025 07:58 16:28

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