Boston Weather in August – Average Temperature and Rainfall
- High
- 27.7°
- Low
- 18.3°
- Rainfall
- 76 mm
- Rainy season
- 11d
- max
- 37.8°
- min
- 11.2°
August
- Early
- 28.5° 25.9 mm
- Mid
- 27.6° 23.8 mm
- Late
- 27.0° 26.3 mm
Summary
The climate figures for Boston are averaged from 2016–2025 observations (10 years). Annual rainfall averages about 1,195 mm.
The rainy season runs March–December. The wettest month is October with 121 mm across 10 rain days; the driest is August at just 76.1 mm.
The hottest month is July (average high 28.7°C) and the coolest is January (3°C).
The most comfortable time to visit Boston is August — less rain and milder heat.
Monthly averages
Common questions
Will it rain in Boston today?
No. The chance of rain today is only about 16%.
How hot is it in Boston today?
Between 13°C and 23°C, with a felt maximum of 21°C.
What is the weather in Boston tomorrow?
Tomorrow: violent showers, 16–18°C, with a 76% chance of rain.