Boston weather in July 2026

Q: How hot is it in Boston in July?

Daytime temperatures usually reach 28°C in Boston in July with moderate heat and humidity, falling to 17°C at night.

Q: How sunny is it in Boston in July?

There are normally 9 hours of bright sunshine each day in Boston in July - that's 63% of daylight hours.

Q: How warm is the sea around Boston in July?

The average sea temperature around Boston in July is 18°C.

Q: Does it rain in Boston in July?

There are usually 9 days with some rain in Boston in July and the average monthly rainfall is 75mm.

Expect daytime maximum temperatures of 28°C in Boston, Massachusetts in July based on long-term weather averages. There are 9 hours of sunshine per day on average with typically 75 mm of rainfall in the month.

28
28°C max day temperature
9
9 hours of sunshine per day
9
9 days with some rainfall
17
17°C min night temperature
15
15 hours of daylight per day
M
Moderate heat & humidity
75
75 mm of monthly rainfall
8
8 (Very High) UV index
18
18°C sea temperature

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The July weather guide for Massachusetts (Boston) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm) | Imperial (°F / inches)