What is the weather like in San Francisco vs Seattle in December?

In December, San Francisco averages 15°C high / 9°C low with about 121 mm of rain; Seattle averages 8°C high / 2°C low with about 103 mm.

San Francisco vs Seattle in December

San Francisco is the better pick in December — 67 vs 49 on SeasonMap's comfort score. San Francisco is cool, rainy, clean air, while Seattle is cold, rainy, clean air.

San Francisco vs Seattle — December climate, side by side

	San Francisco	Seattle
Comfort score	67/100 (C)	49/100 (F)
Feels-like high	13°C	5°C
Avg high / low	15° / 9°	8° / 2°
Rainfall	121 mm	103 mm
Rainy days	9	14
Humidity	82%	87%
Air quality (AQI)	50	38

Monthly climate normals (ERA5 reanalysis). Comfort scores are SeasonMap estimates.

San Francisco vs Seattle in December — FAQ

Is December better in San Francisco or Seattle?: San Francisco is the better pick in December — 67 vs 49 on SeasonMap's comfort score. San Francisco is cool, rainy, clean air, while Seattle is cold, rainy, clean air.
What is the weather like in San Francisco vs Seattle in December?: In December, San Francisco averages 15°C high / 9°C low with about 121 mm of rain; Seattle averages 8°C high / 2°C low with about 103 mm.