Verdict: Excellent month
Boston Weather in August
August runs warm in Boston, with daily highs around 28°C (82°F) and nights near 18°C (64°F). Expect showers on roughly 12 days of the month — rarely trip-ruining, worth planning around. Overall, August is one of the best months of the year to be in Boston.
Average high
28°C / 82°F
Average low
18°C / 64°F
Rain days
~12
Precipitation
92 mm
What to pack for Boston in August
- Summer clothes, plus one light layer for air-con and evenings
- High-SPF sunscreen, sunglasses, and a refillable water bottle
- Rain gear is non-negotiable — expect rain on roughly 12 days
- Comfortable walking shoes — every guide on this site assumes you'll use them
August against the rest of the year
Warmest in Boston: Jul (29°C / 84°F) · Coolest: Jan (4°C / 39°F) · Wettest: Jul (~13 rain days)
4°
-4°
Jan
5°
-5°
Feb
9°
-1°
Mar
13°
4°
Apr
20°
10°
May
26°
15°
Jun
29°
19°
Jul
28°
18°
Aug
23°
14°
Sep
18°
9°
Oct
12°
3°
Nov
6°
-2°
Dec
Daily highs / lows in °C · bars show rain days per month · ERA5 climate normals (2020–2024)