Boston Weather in August
United States · Humid Continental climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
August in Boston sees average temperatures ranging from a low of 18.4°C (65.1°F) to a high of 27.6°C (81.7°F), with a mean of 22.7°C (72.9°F). Compared to the annual average of 11.2°C (52.2°F), this month is 11.5°C warmer than the yearly norm. Precipitation averages 92.2mm, making it approximately 9.0mm drier than the monthly average of 102.0mm. The city receives an average of 10.7 hours of sunshine per day during August, with relative humidity averaging 73.6%. Wind speeds reach an average maximum of 18.4 km/h. For travelers, this month offers a temperature experience in Boston, with drier-than-average conditions compared to the rest of the year.
Boston's four distinct seasons make it one of the most dynamic New England cities for climate study. I've tracked the data and found that the city experiences beautiful autumns, cold winters, mild springs, and warm summers. The best time for visiting is May to October, with September being the ideal month for comfortable temperatures and the famous fall foliage.
August vs Adjacent Months
| Metric | July | August | September |
|---|---|---|---|
| Mean Temp | 23.8°C (74.8°F) | 22.7°C (72.9°F) | 18.5°C (65.3°F) |
| Rainfall | 118.5mm | 92.2mm | 126.5mm |
| Sunshine | 11.2 hrs | 10.7 hrs | 8.9 hrs |
| Humidity | 73.0% | 73.6% | 76.2% |
| Wind | 18.9 km/h | 18.4 km/h | 18.4 km/h |
| Rainy Days | 18.2 | 17.0 | 14.8 |
Seasonal Context
August falls in Summer in the Northern Hemisphere. Summer brings the warmest conditions of the year with the longest daylight hours. For travelers visiting Boston in August, the data indicates favorable conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Boston in August?
The average temperature in Boston during August ranges from 18.4°C (65.1°F) to 27.6°C (81.7°F), with a mean of 22.7°C (72.9°F).
How much does it rain in Boston in August?
Boston receives an average of 92.2mm of precipitation in August, spread across approximately 17.0 rainy days.
What should I pack for Boston in August?
Based on August weather data, pack layers including light jackets and t-shirts, plus an umbrella.
Is August a good time to visit Boston?
August is a good time to visit Boston, with comfortable temperatures and manageable rainfall.
Other Months for Boston
Cities with Similar August Climate (Humid Continental)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: 42.36°, -71.06°. Timezone: America/New_York. Last updated: 2026-07-30.