Boston, Massachusetts weather in January

Averages from 2021–2025 (155 days of record).

Average high: 37°F
Average low: 23°F
Rainy days: ~11 per month
Total precipitation: 4.4 in
Warmest recorded: 59°F
Coldest recorded: -4°F

Expect January days in Boston, Massachusetts to top out around 37°F and cool to about 23°F overnight, with roughly 11 days of measurable rain across the month. In recent years January has ranged from -4°F to 59°F.

Other months

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Current Boston, Massachusetts forecast → · Historical data by Open-Meteo (ERA5).