Seattle Weather in December
7.5°C high · 2°C low · 161 mm rain · 1.3h sun
Dec is a cool month in Seattle — not peak season, but a good time to avoid crowds.
December at a glance
| Metric | Value |
|---|---|
| Average high | 7.5°C |
| Average low | 2°C |
| Rainfall | 161 mm |
| Sunshine | 1.3 hours/day |
| Daylight | 8.2 hours |
What to pack in December
Pack a warm coat and layers, plus a raincoat and umbrella for Seattle in December.
Seattle weather by month
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Frequently asked questions
What is the weather in Seattle in December?
Highs of 7.5°C and lows of 2°C, with about 161 mm of rain and 1.3 hours of sunshine per day.
Is December a good time to visit Seattle?
Dec is a cool month in Seattle — not peak season, but a good time to avoid crowds.
What to do in Seattle · Best time to visit Seattle
Climate data: Open-Meteo Historical (ERA5), 1991–2020. CC BY 4.0.