Monthly climate guide
Boston weather in August
August in Boston is typically hot, with average daytime highs around 28°C (82°F) and night-time lows near 17°C (63°F). The month usually brings about 96 mm of rain (wet) and is a mix of sun and cloud. Daytime highs are about the same as July and 4°C warmer than September.
What stands out in August
- It's humid — around 72% — so the heat feels heavier.
- August is Boston's second warmest month.
- Temperatures are falling — expect highs around 4°C lower by September.
- It's one of the sunniest months here, with cloud cover around 51%.
Avg high
28°C
82°F
Avg low
17°C
63°F
Rainfall
96 mm
wet
Humidity
72%
relative
Sky
51%
cloud · a mix of sun and cloud
Boston weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 1°C / 34°F | -7°C / 19°F | 84 mm | 87% | 62% |
| February | 2°C / 35°F | -7°C / 19°F | 92 mm | 88% | 63% |
| March | 6°C / 43°F | -3°C / 26°F | 86 mm | 82% | 61% |
| April | 13°C / 55°F | 2°C / 36°F | 108 mm | 79% | 63% |
| May | 19°C / 66°F | 9°C / 47°F | 77 mm | 79% | 65% |
| June | 24°C / 74°F | 14°C / 56°F | 116 mm | 78% | 60% |
| July | 28°C / 83°F | 18°C / 64°F | 87 mm | 75% | 54% |
| August | 28°C / 82°F | 17°C / 63°F | 96 mm | 72% | 51% |
| September | 24°C / 75°F | 13°C / 56°F | 91 mm | 74% | 53% |
| October | 17°C / 63°F | 8°C / 46°F | 125 mm | 79% | 61% |
| November | 10°C / 49°F | 1°C / 34°F | 97 mm | 81% | 57% |
| December | 4°C / 40°F | -3°C / 27°F | 122 mm | 87% | 66% |
What to pack for August
- Light, breathable clothing (cotton or linen)
- A sun hat and high-SPF sunscreen
- A refillable water bottle
- A compact umbrella or packable rain jacket
- Water-resistant shoes
Is August a good time to visit Boston?
Compare the months in the chart above to find your ideal window.
Best time to visit Boston →Other United States cities in August
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Boston weather in August. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/usa/boston/august
<a href="https://weathercompare.eu/weather/usa/boston/august">Boston weather in August</a> (WeatherCompare)
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Boston in August: quick answers
Is August a good time to visit Boston?
August is one of the wetter months in Boston, with about 96 mm of rain. You can still go: pack a rain jacket and keep plans flexible.
How warm is Boston in August?
Average highs are about 28°C (82°F) and average lows about 17°C (63°F), based on 10 years of daily data.
Does it rain a lot in Boston in August?
Boston typically gets around 96 mm of rain in August — wet.
Figures are long-term averages for the area around Boston (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.