July Weather in Boston, United States

Last updated: June 24, 2025

In July, the average temperature in Boston, United States reaches a pleasant 26°C (79°F). Expect a range with minimums dipping to 21°C (69°F) and highs soaring to 31°C (89°F). Be prepared for some rain, as 107 mm (4.2 in) of precipitation can fall over the course of 8 days, contributing to an average humidity of 81%.

July Temperature in Boston

In July in Boston, the average temperature is 26°C (79°F). The maximum can reach 31°C (89°F), while the minimum can drop to as low as 21°C (69°F). This pleasant climate makes Boston an ideal destination for travelers seeking warm weather and outdoor activities.

July Weather in Boston: Daily Temperature Highs, Lows, and Averages

The chart illustrates July temperature patterns in Boston, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Boston, July typically has an average temperature of 26°C (79°F), with highs reaching up to 31°C (89°F) and lows dropping to around 21°C (69°F).

Data source: Temperature data for Boston generated using information from the Copernicus Climate Change Service.

July Precipitation in Boston

In Boston in July, the total precipitation amount is 107 mm (4.2 in), occurring over a span of 8 days.

July Precipitation Trends in Boston

The chart displays monthly precipitation patterns in Boston, with values for each month alongside July’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how July’s conditions compare to those of other months. In Boston, July typically receives around 107 mm (4.2 inches) of precipitation spread over approximately 8 days.

Data source: Precipitation data for July generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

July Humidity in Boston

In Boston in July, humidity is 81%. With an average temperature of 26°C (79°F), this humidity feels like a warm, heavy blanket wrapping around you, making outdoor adventures stickier and more draining, yet still vibrant with life—perfect for exploring local culture, but you'll want to take frequent breaks and stay hydrated.

July Average Humidity in Boston

This chart illustrates the average monthly humidity levels in Boston, with July’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In July, average humidity in Boston is approximately 81%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for July generated using information from the Copernicus Climate Change Service.

July UV Index in Boston

In Boston in July, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Boston.

Maximum UV Index Levels in Boston for July

The chart shows the monthly maximum UV Index (UVI) for Boston in July, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In July, the maximum UV index in Boston typically reaches 11, which falls under the extreme exposure category.

Data source: Boston July UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How July Weather in Boston Compares to Other Months

Weather in Boston varies notably across the year, with each month offering distinct climate conditions. This page compares July’s weather to other months in Boston, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Boston, showing how July’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	5°C (41°F)	94 mm (3.7 inches)	84%	moderate
February Weather	6°C (43°F)	119 mm (4.7 inches)	83%	moderate
March Weather	8°C (47°F)	87 mm (3.4 inches)	82%	high
April Weather	13°C (55°F)	86 mm (3.4 inches)	81%	very high
May Weather	17°C (64°F)	89 mm (3.5 inches)	80%	very high
June Weather	23°C (73°F)	73 mm (2.9 inches)	82%	very high
July Weather	26°C (79°F)	107 mm (4.2 inches)	81%	extreme
August Weather	26°C (78°F)	104 mm (4.1 inches)	81%	very high
September Weather	23°C (75°F)	105 mm (4.1 inches)	78%	very high
October Weather	19°C (67°F)	108 mm (4.2 inches)	80%	high
November Weather	12°C (54°F)	91 mm (3.6 inches)	84%	moderate
December Weather	8°C (47°F)	102 mm (4.0 inches)	84%	moderate