Weather in Seattle in December
December in Seattle is a coat month. Treat it as cities, food and short walks, not as a terrace holiday.
In United States, this is how Seattle actually wears December, not how a country centroid would. December is the cold side of the year in Seattle. Pack for that, not for a leftover summer photo.
- Average temp
- 5°C
3–8°C
- Rainfall
- 147 mm
Showers likely
- Sunshine
- —
- Wind
- 14 km/h
What to expect
Daytime
You want a proper coat in Seattle in December, not a festival jacket. Wind makes the same afternoon feel sharper than the map suggests.
Outdoor time is the middle of the day. Finish plans before the light goes. Evenings are for indoors.
Rain
December is the wet side of the year in Seattle. Days can be heavy. Plans that cannot survive rain are the wrong plans.
This is not a reason to skip Seattle if you like the place. It is a reason to pack for weather and to stop treating every grey hour as a failed holiday.
Evening
Evenings are cooler. A layer helps after sunset.
What to pack
Rain jacket
A layer for cooler evenings
Where to stay in Seattle
Dates are a starting point for December.
Travel guides for Seattle
What to read before you book.
Average weather in Seattle
TemperatureRainfall
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FAQs about Seattle
Climate averages for Seattle, 1991–2020.
The best time to visit Seattle is between May and October, the most comfortable stretch of the year on these averages.
August is the hottest month, with an average around 19°C.
November is the wettest month, with about 160 mm of rain.
No. These are 1991–2020 climate normals from Meteostat, not a live forecast. Actual weather in any given week can differ.
