Seattle Weather in December

What's the weather like in Seattle (Washington) in December 2024?

The climate in Seattle during December can be summarized as cool and wet.

December is in the winter in Seattle and is typically the 2nd coldest month of the year. Daytime maximum temperatures average around a cool 8°C (46°F), whilst at night 2°C (36°F) is normal.

Seattle weather averages (imperial / metric)
Daytime temperature 7.7°C 45.8°F
Nightly temperature 2.4°C 36.2°F
Average temperature 5°C 41°F
Daily sunshine 2 hrs
Avg rainfall 151 mm 5.9 ins
Rainy days 18 days
Sea temperature 8.6°C 47.5°F
Humidity 81%
Windspeed 14kph 9 mph

On average December is the wettest month of the year in Seattle with around 151mm 5.9 inches of rain making it a wet time to visit. This rainfall is typically spread over 18 days, although this may vary considerably.

On the flip side this corresponds to an average of 2 hours of sunshine per day.

December temperatures in Seattle

Seattle average temperature in December

December rainfall

Seattle average rain in December

December hourly sunshine

Seattle average rain in December

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Seattle in December 2024.

Other monthly averages

Best places to visit in December

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Seattle weather stats

Seattle weather statistics
Hottest month: August 23.5°C 74.3°F
Driest month: July 21mm 0.8ins
Sunniest month: July 10.8hrs
Coldest month: January 7.2°C 45°F
Wettest month: December 151mm 5.9ins
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