Boston weather in August
Boston in August averages 23°C (73°F), 80 mm of rain and 8.8 hours of sun a day.
Of the twelve months in Boston, August is the second warmest, the second driest and the second sunniest.
- Average temp
- 23°C (73°F)
19–27°C · 65–81°F
- Rainfall
- 80 mm
Showers likely
- Sunshine
- 8.8 h
hours per day
- Wind
- 16 km/h
What is Boston like in August?
Daytime
Days are warm, typically in the mid-20s°C or above.
Rain
Some rain is likely; pack for showers.
Evening
Evenings stay warm.
What should I pack for Boston in August?
High-factor sun cream
With 8.8 hours of sun a day, burn time is short even in shade.
Sunglasses and a brimmed hat
Midday glare is the part people underpack for, not the heat itself.
A light rain jacket
About 80 mm falls this month — showers rather than washouts.
August compared with July and September
August in Boston is 0.7°C cooler than July and about as wet as it, which averages 24°C (74°F).
August in Boston is 4°C warmer than September and 10 mm drier than it, which averages 19°C (66°F).
Daylight in Boston in August
On 15 August the sun is up for 13 hours 52 minutes in Boston, rising about 05:51 and setting about 19:44 local time.
August ends 1 hour 16 minutes shorter than it begins, so the last week of the month is a different length of day from the first.
That is 1 hour 24 minutes short of June, the longest-lit month here.
Where to stay in Boston
Dates are a starting point for August.
Travel guides for Boston
What to read before you book.
Boston weather by month
TemperatureRainfall
How August compares with the rest of the year
August is highlighted. Every other month links to its own page.
| Month | Average | Rainfall |
|---|---|---|
| January | -1°C / 30°F | 84 mm |
| February | 0°C / 32°F | 79 mm |
| March | 4°C / 38°F | 105 mm |
| April | 9°C / 49°F | 91 mm |
| May | 15°C / 59°F | 83 mm |
| June | 20°C / 68°F | 99 mm |
| July | 24°C / 74°F | 82 mm |
| August | 23°C / 73°F | 80 mm |
| September | 19°C / 66°F | 90 mm |
| October | 13°C / 55°F | 101 mm |
| November | 7°C / 45°F | 93 mm |
| December | 2°C / 36°F | 107 mm |
Check another month
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FAQs about Boston in August
August climate averages for Boston, 1991–2020.
Boston averages 23°C (73°F) in August, ranging from about 19°C (65°F) at night to 27°C (81°F) in the afternoon. That is a 1991–2020 average, so an individual week can run either side of it.
Some. About 80 mm falls across August, enough to need a light jacket but not enough to reshape a trip.
Yes. August averages 23°C (73°F) against 19°C (66°F) in September — 4°C warmer.
August is 0.7°C cooler than July, and about as wet.
Yes. August falls inside the most comfortable stretch of the year here, May to October, on temperature and rainfall together.
About 8.8 hours of sun a day on the 1991–2020 average — among the brighter months anywhere.
This page does not show today's weather. It is a 1991–2020 climate normal from Meteostat — a long-run average of what August is usually like, which is what you want when booking months ahead. For today or the coming week, check a live forecast.
About 13 hours 52 minutes of daylight in mid-August, against 15 hours 16 minutes in June and 9 hours 6 minutes in December.
On 15 August, sunrise is about 05:51 and sunset about 19:44 local time. Both shift across the month — the month ends 1 hour 16 minutes shorter than it starts.
