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Climate · Boston

Boston in August

Warm and damp, as the days shorten.

Typical weather, averaged over 30 years

August in Boston is warm: highs near 84°F, lows near 65°F. Rain falls on about two days a week, and the days shorten by 1 hour 13 minutes from the first week to the last.August in Boston is warm: highs near 29°C, lows near 18°C. Rain falls on about two days a week, and the days shorten by 1 hour 13 minutes from the first week to the last.

High
84°F29°Caverage
Low
65°F18°Caverage
Wet days
2a week · 34% of days
Daylight
13h 49mon average

Is August a good time to visit Boston?

A good month, just outside Boston's best months, which run in two parts: June, or September.

How we judge it: every month is scored on how close its typical high comes to the range from 70°F to 80°F, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.How we judge it: every month is scored on how close its typical high comes to the range from 21°C to 27°C, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.

How August sits in the year

week by week

Temperature

Highs near 84°F in August, against 40°F to 85°F through the year.Highs near 29°C in August, against 4°C to 29°C through the year.

Chance of a wet day

34% of days in August, against 27% to 38% through the year.

Cloud cover

44% cover in August, against 41% to 58% through the year.

Daylight

13h 49m in August, against 9h 08m to 15h 14m through the year.

Week by week, lightly smoothed, with August shaded. The olive line marks the best months. Hover or tap a week for its figures.

Either side

  1. July85°29°low 66°low 19°2 wet days a weekRain on about two days a week.
  2. August84°29°low 65°low 18°2 wet days a weekRain on about two days a week.
  3. September77°25°low 59°low 15°2 wet days a weekRain on about two days a week.

Where Boston sits, in August

America/New York
this place
typical high in August 40°F4°C95°F35°C
Sunrise, mid-August
5:51 AMsets 7:48 PM
Above the sea
0 mlow-lying
Latitude
42.4°Nnorthern hemisphere
Nearest of ours
Amherst120 km west

The land around Boston, shaded by its typical high in August, the planning map's own layer. Hover the map for the figure at that spot; tap it on a phone. Clock times are local, for the 15th.

Elsewhere in United States in August

high · low · wet days
See August on the planning mapThe whole year in Boston

Typical weather, averaged over 30 years (1995–2024), from the 11 km grid square nearest Boston. Temperatures are adjusted against 66 weather stations: daytime highs read about 3.1°F cold in the source data and are raised to match.Temperatures are adjusted against 66 weather stations: daytime highs read about 1.7°C cold in the source data and are raised to match. Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not. Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.

Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not.

Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.