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Seattle in December: weather, sea & travel advice
This month's data profile
Rain shapes the decision
Seattle in December is climatically mixed. The average daily high is around 7 °C, and the sea is about 9 °C. With about 20 rainy days it is very wet.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
12/100 · #12
Warmth
#12
Dryness
#11
Sun
#12
Sea warmth
#9
Published best categories: none
Seattle · DecemberPhoto: Daniel Schwen · CC BY-SA 4.0Climate facts
- Average high
- 7 °C
- Average low
- 2 °C
- Sea
- 9 °C
- Rainy days (est.)
- 20 rainy days (est.)
- Sun (est.)
- 1 h/day
- Humidity
- 91 %
Climate evidence with direct month comparison
The highlighted row is the selected month. Precipitation total and rainy days are separate monthly averages.
| Month | Avg high °C | Avg low °C | Rainy days (est.) | Precipitation mm | Sun h/day (est.) | Humidity % | Wind m/s | Sea °C | Score |
|---|---|---|---|---|---|---|---|---|---|
| November | 10 | 4 | 20 | 192 | 1.5 | 89 | 0.9 | 9 | 15 |
| December (selected) | 7 | 2 | 20 | 187 | 1.1 | 91 | 0.9 | 9 | 12 |
| January | 7 | 2 | 19 | 175 | 1.3 | 90 | 0.8 | 8 | 13 |
How do the previous and next months compare?
Baseline: December (12/100)
Positive and negative values show the change from the selected month.
| Score Δ | Average high Δ | Average low Δ | Rainy days Δ | Rain Δ | Sun Δ | Humidity Δ | Wind Δ | Sea Δ | |
|---|---|---|---|---|---|---|---|---|---|
| November | +3 | +3.2 °C | +2.2 °C | ±0 | +4.8 mm | +0.4 h | -1.4 % | ±0 m/s | +0.8 °C |
| January | +1 | +0.5 °C | +0.1 °C | -0.8 | -11.6 mm | +0.2 h | -0.3 % | ±0 m/s | -0.5 °C |
All twelve months in context
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Useful next decisions
Frequently asked questions
How warm is Seattle in December?
The average daily high is around 7 °C, with an average daily low of about 2 °C.
Can you swim in Seattle in December?
The sea is about 9 °C (cold).
Does it rain a lot in Seattle in December?
The curated estimate is about 20 rainy days per month, not a directly measured long-term average. Total precipitation averages around 187 mm for the month. A rainy day does not mean all-day rain.
When is the best time to visit Seattle?
By the climate score, July, August and September are the strongest months for Seattle. For a beach trip: July and August. December is not among them.