July Weather in Somerville, United States

Last updated: June 24, 2025

In July, the average temperature in Somerville, United States hovers around 21°C (71°F), with a minimum dipping to 9°C (49°F) and a maximum soaring to 35°C (96°F). Expect about 105 mm (4.1 in) of precipitation over 11 days, accompanied by an average humidity of 74%.

July Temperature in Somerville

In July in Somerville, the average temperature is 21°C (71°F), with maximums reaching up to 35°C (96°F) and minimums dipping as low as 9°C (49°F). Be sure to pack for warm afternoons while also preparing for cooler evenings during your travels.

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

The chart illustrates July temperature patterns in Somerville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Somerville, July typically has an average temperature of 21°C (71°F), with highs reaching up to 35°C (96°F) and lows dropping to around 9°C (49°F).

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

July Precipitation in Somerville

In Somerville in July, the precipitation amount is 105 mm (4.1 in) over the course of 11 days.

July Precipitation Trends in Somerville

The chart displays monthly precipitation patterns in Somerville, 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 Somerville, July typically receives around 105 mm (4.1 inches) of precipitation spread over approximately 11 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 Somerville

In Somerville in July, humidity is 74%. With an average temperature of 21°C (71°F), this humidity feels like traveling through a warm, damp blanket, making outdoor excursions feel sticky and a bit stifling, often prompting the need for frequent breaks to stay refreshed.

July Average Humidity in Somerville

This chart illustrates the average monthly humidity levels in Somerville, 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 Somerville is approximately 74%, 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 Somerville

In Somerville in July, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Somerville.

Maximum UV Index Levels in Somerville for July

The chart shows the monthly maximum UV Index (UVI) for Somerville 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 Somerville typically reaches 9, which falls under the very high exposure category.

Data source: Somerville 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 Somerville Compares to Other Months

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

This table compares monthly weather conditions in Somerville, showing how July’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-4°C (25°F)	88 mm (3.5 inches)	88%	low
February Weather	-3°C (26°F)	86 mm (3.4 inches)	88%	moderate
March Weather	0°C (33°F)	72 mm (2.8 inches)	85%	moderate
April Weather	7°C (44°F)	124 mm (4.9 inches)	81%	high
May Weather	12°C (55°F)	80 mm (3.2 inches)	76%	very high
June Weather	18°C (65°F)	64 mm (2.5 inches)	74%	very high
July Weather	21°C (71°F)	105 mm (4.1 inches)	74%	very high
August Weather	21°C (70°F)	77 mm (3.0 inches)	74%	very high
September Weather	17°C (63°F)	73 mm (2.9 inches)	77%	high
October Weather	11°C (52°F)	129 mm (5.1 inches)	82%	moderate
November Weather	3°C (38°F)	109 mm (4.3 inches)	85%	moderate
December Weather	-2°C (28°F)	121 mm (4.8 inches)	84%	low