July Weather in Boston, United States

Last updated: June 24, 2025

In Boston, United States, the average temperature in July hovers around 27°C (81°F). Expect a minimum of 20°C (69°F) and highs reaching up to 37°C (99°F). With an average humidity of 80%, be prepared for a rather muggy atmosphere. Additionally, anticipate 148 mm (5.8 in) of precipitation spread over 20 days, ensuring that a cozy umbrella might come in handy!

July Temperature in Boston

In July in Boston, the average temperature is 27°C (81°F). Maximum temperatures can reach 37°C (99°F), while minimums can dip as low as 20°C (69°F). Travelers should prepare for warm days and comfortably mild evenings, making it an ideal time for 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 27°C (81°F), with highs reaching up to 37°C (99°F) and lows dropping to around 20°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 148 mm (5.8 in) spread over 20 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 148 mm (5.8 inches) of precipitation spread over approximately 20 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 80%. With an average temperature of 27°C (81°F), this humidity feels like a warm, enveloping blanket that clings to your skin, making travel tiring as sweat beads form quickly and the air feels thick and heavy.

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 80%, 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	12°C (54°F)	72 mm (2.8 inches)	85%	moderate
February Weather	15°C (60°F)	96 mm (3.8 inches)	82%	very high
March Weather	17°C (64°F)	52 mm (2.1 inches)	80%	very high
April Weather	20°C (69°F)	80 mm (3.1 inches)	76%	very high
May Weather	25°C (76°F)	74 mm (2.9 inches)	73%	extreme
June Weather	27°C (80°F)	157 mm (6.2 inches)	74%	extreme
July Weather	27°C (81°F)	148 mm (5.8 inches)	80%	extreme
August Weather	27°C (82°F)	137 mm (5.4 inches)	79%	extreme
September Weather	26°C (80°F)	110 mm (4.3 inches)	83%	very high
October Weather	23°C (74°F)	73 mm (2.9 inches)	77%	very high
November Weather	16°C (61°F)	50 mm (2.0 inches)	84%	high
December Weather	13°C (56°F)	117 mm (4.6 inches)	88%	moderate