Boston weather in July
Temperature, sea and sunshine in July: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in July
Excellent
Best time to visit: May – September
What is the weather like in Boston in July?
In July, Boston is warm: daytime highs average 27 °C, and nights cool down to about 19 °C. The sea averages 18.4 °C – bracing, so a wetsuit helps for longer swims. The sun shines for around 8 hours a day. Rain is frequent, with about 10 rainy days and 80 mm in total. On about 5 days the thermometer climbs to 30 °C or more. All in all, July is an excellent month for a holiday in Boston.
July compared
How the weather changes from June to August. Tap a month to open it.
More details for July
- Daylight
- 15 h 0 min05:20 – 20:20
- UV index
- 9 · very highclear sky, noon (estimate)All months
- Muggy days
- 14 daysdew point 18 °C or moreAll months
- Wind
- 17 km/haverage daily peakAll months
- Cloud cover
- 56 %on averageAll months
- Hot days
- 5 days30 °C or moreAll months
- Snow days
- 0 days1 cm or more of fresh snowAll months
- Time zone
- UTC−4America/New_York
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %78 %
- Few rainy daysweight 30 %58 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in July
- Wetsuit for longer swims
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Rain jacket or umbrella
Boston in July: quick answers
Is Boston hot in July?
Warm rather than hot: in July, daytime highs in Boston average 27 °C and nights cool to about 19 °C. On about 5 days the thermometer climbs to 30 °C or more.
Can you swim in Boston in July?
Only if you don't mind cold water: in July the sea averages just 18.4 °C. Comfortable swimming temperatures are not reached at any time of year.
Does it rain much in Boston in July?
Rain is frequent, with about 10 rainy days and 80 mm in total.
Boston month by month
The whole year in BostonAll destinations: USAWhere to go in JulySea temperature in July
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences