July Weather in Fairfax, United States

Last updated: June 24, 2025

In July, the average temperature in Fairfax, United States is a warm 28°C (82°F). Visitors can expect a minimum of 16°C (62°F) and a maximum soaring up to 41°C (106°F). The month typically sees about 80 mm (3.2 in) of precipitation over 8 days, contributing to an average humidity of 81%. Be prepared for heat and occasional rain!

July Temperature in Fairfax

In July in Fairfax, the average temperature is 28°C (82°F), with maximums reaching up to 41°C (106°F) and minimums dropping as low as 16°C (62°F). Be prepared for warm weather, but don’t forget to pack a light sweater for the cooler evenings.

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

The chart illustrates July temperature patterns in Fairfax, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Fairfax, July typically has an average temperature of 28°C (82°F), with highs reaching up to 41°C (106°F) and lows dropping to around 16°C (62°F).

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

July Precipitation in Fairfax

In Fairfax in July, the total precipitation amount is 80 mm (3.2 in), occurring over a span of 8 days.

July Precipitation Trends in Fairfax

The chart displays monthly precipitation patterns in Fairfax, 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 Fairfax, July typically receives around 80 mm (3.2 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 Fairfax

In Fairfax in July, humidity is 81%. With an average temperature of 28°C (82°F), this humidity feels like a warm blanket wrapped around you, making traveling somewhat uncomfortable as the air thickens, leaving you longing for a refreshing breeze.

July Average Humidity in Fairfax

This chart illustrates the average monthly humidity levels in Fairfax, 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 Fairfax 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 Fairfax

In Fairfax 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 Fairfax.

Maximum UV Index Levels in Fairfax for July

The chart shows the monthly maximum UV Index (UVI) for Fairfax 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 Fairfax typically reaches 11, which falls under the extreme exposure category.

Data source: Fairfax 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 Fairfax Compares to Other Months

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

This table compares monthly weather conditions in Fairfax, showing how July’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	3°C (38°F)	57 mm (2.3 inches)	77%	moderate
February Weather	4°C (39°F)	43 mm (1.7 inches)	76%	high
March Weather	11°C (52°F)	97 mm (3.8 inches)	71%	high
April Weather	15°C (59°F)	104 mm (4.1 inches)	73%	very high
May Weather	20°C (69°F)	160 mm (6.3 inches)	83%	very high
June Weather	26°C (79°F)	101 mm (4.0 inches)	83%	extreme
July Weather	28°C (82°F)	80 mm (3.2 inches)	81%	extreme
August Weather	27°C (80°F)	103 mm (4.1 inches)	73%	very high
September Weather	24°C (76°F)	88 mm (3.4 inches)	67%	very high
October Weather	16°C (61°F)	121 mm (4.8 inches)	72%	high
November Weather	9°C (49°F)	34 mm (1.3 inches)	82%	moderate
December Weather	6°C (43°F)	35 mm (1.4 inches)	85%	moderate