What is the weather like in Boston vs San Francisco in January?

In January, Boston averages 3°C high / -5°C low with about 95 mm of rain; San Francisco averages 15°C high / 9°C low with about 123 mm.

Boston vs San Francisco in January

San Francisco is the better pick in January — 68 vs 41 on SeasonMap's comfort score. San Francisco is cool, rainy, clean air, while Boston is freezing, rainy, clean air.

Boston vs San Francisco — January climate, side by side

	Boston	San Francisco
Comfort score	41/100 (F)	68/100 (C)
Feels-like high	-1°C	13°C
Avg high / low	3° / -5°	15° / 9°
Rainfall	95 mm	123 mm
Rainy days	9	10
Humidity	68%	83%
Air quality (AQI)	41	45

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

Boston vs San Francisco in January — FAQ

Is January better in Boston or San Francisco?: San Francisco is the better pick in January — 68 vs 41 on SeasonMap's comfort score. San Francisco is cool, rainy, clean air, while Boston is freezing, rainy, clean air.
What is the weather like in Boston vs San Francisco in January?: In January, Boston averages 3°C high / -5°C low with about 95 mm of rain; San Francisco averages 15°C high / 9°C low with about 123 mm.