Seattle Weather in December
United States · 30-year monthly averages
⚠️ Challenging time to visit
December in Seattle is chilly, with average daytime highs around 8°C (47°F) and nighttime lows near 3°C (37°F). Expect roughly 145mm of precipitation spread over about 16 rainy days, and this is one of the wetter months.
Avg high
8°C
47°F
Avg low
3°C
37°F
Rainfall
145mm
rainy
Rainy days
16
days with ≥1mm
🎒 What to pack
- jacket or coat
- long-sleeve layers
- compact umbrella or rain jacket
December vs the rest of the year
FAQ
- How hot is Seattle in December?
- December in Seattle is chilly, with average daytime highs around 8°C (47°F) and nighttime lows near 3°C (37°F). Expect roughly 145mm of precipitation spread over about 16 rainy days, and this is one of the wetter months.
- Does it rain a lot in Seattle in December?
- Seattle sees around 145mm of precipitation in December on average — rainy by global standards.
- Is December a good time to visit Seattle?
- December is a challenging month to visit Seattle weather-wise — plan around the conditions.