Boston, MA weather by month
Northeast · Station: Logan International Airport, MA · NOAA 1991–2020 Climate Normals
The best time to visit Boston, MA is May, July–September, when average daytime highs are comfortable and rainfall sits at or below the city's monthly average. Boston is hottest in July (avg high 82°F) and coolest in January (avg high 37°F). The wettest month is December (4.3 in) and the driest is February (3.2 in). Overall the annual mean temperature is about 51.9°F with 43.7 in of precipitation a year and 49.2 in of snow.
Source: NOAA NCEI U.S. Climate Normals 1991–2020. Data as of June 2026.
Monthly weather averages for Boston
| Month | Avg high (°F) | Avg low (°F) | Avg precip (in) | Avg snow (in) |
|---|---|---|---|---|
| January | 37 | 23 | 3.4 | 14.3 |
| February | 39 | 25 | 3.2 | 14.4 |
| March | 46 | 31 | 4.2 | 9 |
| April | 56 | 41 | 3.6 | 1.6 |
| May | 66 | 50 | 3.3 | 0 |
| June | 76 | 60 | 3.9 | 0 |
| July | 82 | 66 | 3.3 | 0 |
| August | 80 | 65 | 3.2 | 0 |
| September | 73 | 58 | 3.6 | 0 |
| October | 62 | 48 | 4 | 0.2 |
| November | 52 | 38 | 3.7 | 0.7 |
| December | 42 | 29 | 4.3 | 9 |
Source: NOAA NCEI U.S. Climate Normals 1991–2020. Data as of June 2026.
Best time to visit Boston
Based on the normals above, the most pleasant window is May, July–September. In those months daytime highs are in the mild-to-warm range and precipitation is no higher than the city's typical month, so you avoid both the peak warm of July (when highs reach about 82°F — t-shirt weather; sunscreen advised) and the cool, darker conditions around January (highs near 37°F). Try to avoid December if rain would spoil your plans — it is the wettest month at 4.3 in. Use the packing & comfort tool to check any specific month.
How Boston compares
Boston's 43.7 in of annual precipitation and 51.9°F mean temperature put it in context with other US cities. See where it ranks for warmest in January, rainiest overall and driest overall, or browse the full list of cities.
Frequently asked questions
What is the best time to visit Boston?
The most comfortable time to visit Boston, MA is May, July–September, when average daytime highs are mild and rainfall is at or below the city's average. Boston is hottest in July (avg high 82°F) and coolest in January (avg high 37°F), per NOAA 1991–2020 Climate Normals.
What is the average temperature in Boston?
Boston's annual mean temperature is about 51.9°F. The warmest month is July (average high 82°F, low 66°F) and the coolest is January (average high 37°F, low 23°F).
How much rain does Boston get?
Boston receives about 43.7 inches of precipitation a year. The wettest month is December (4.3 in) and the driest is February (3.2 in).
Does it snow in Boston?
Yes. Boston averages about 49.2 inches of snow a year. Snow normally falls between late autumn and early spring; summer months see none.
Source
Monthly averages from the NOAA NCEI U.S. Climate Normals 1991–2020, station Logan International Airport, MA (reference values verified against the published normals). Climate normals describe a 30-year average, not a forecast; any individual year can differ. See our methodology for how "best time to visit" is derived.
Last updated: 2026-06-18