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Boston in January: weather, sea & travel advice
This month's data profile
Clear transition month
Boston in January is climatically mixed. The average daily high is around 1 °C, and the sea is about 5 °C. With about 10 rainy days it is wet.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
27/100 · #11
Warmth
#12
Dryness
#5
Sun
#11
Sea warmth
#10
Published best categories: none
Boston · JanuaryPhoto: Chris Wood ( User:chris_j_wood ) · CC BY-SA 4.0Climate facts
- Average high
- 1 °C
- Average low
- -8 °C
- Sea
- 5 °C
- Rainy days (est.)
- 10 rainy days (est.)
- Sun (est.)
- 2 h/day
- Humidity
- 88 %
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 |
|---|---|---|---|---|---|---|---|---|---|
| December | 4 | -4 | 11 | 115 | 1.9 | 86 | 0.8 | 8 | 25 |
| January (selected) | 1 | -8 | 10 | 94 | 2.2 | 88 | 1.0 | 5 | 27 |
| February | 2 | -7 | 9 | 83 | 3.3 | 87 | 1.2 | 3 | 30 |
How do the previous and next months compare?
Baseline: January (27/100)
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 | |
|---|---|---|---|---|---|---|---|---|---|
| December | -2 | +3.2 °C | +3.9 °C | +1.1 | +20.7 mm | -0.3 h | -2.2 % | -0.2 m/s | +2.5 °C |
| February | +3 | +1.2 °C | +0.6 °C | -0.9 | -10.9 mm | +1.1 h | -1 % | +0.2 m/s | -1.6 °C |
All twelve months in context
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Useful next decisions
Frequently asked questions
How warm is Boston in January?
The average daily high is around 1 °C, with an average daily low of about -8 °C.
Can you swim in Boston in January?
The sea is about 5 °C (cold).
Does it rain a lot in Boston in January?
The curated estimate is about 10 rainy days per month, not a directly measured long-term average. Total precipitation averages around 94 mm for the month. A rainy day does not mean all-day rain.
When is the best time to visit Boston?
By the climate score, June, July, August and September are the strongest months for Boston. For a beach trip: July, August and September. January is not among them.