July Weather in Reston, United States

Last updated: June 24, 2025

In Reston, United States, the average temperature in July reaches a pleasant 27°C (81°F). However, be prepared for a temperature range that can dip to as low as 14°C (58°F) and soar up to 38°C (101°F). With an average humidity of 74%, the air can feel quite humid. Additionally, expect 141 mm (5.5 in) of precipitation spread over 12 days, so bringing an umbrella might be a wise choice!

July Temperature in Reston

In July in Reston, the average temperature is 27°C (81°F). The maximum can reach 38°C (101°F), while the minimum can drop as low as 14°C (58°F). Pack light, breathable clothing for warm days, but don’t forget a sweater for cooler evenings.

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

The chart illustrates July temperature patterns in Reston, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Reston, July typically has an average temperature of 27°C (81°F), with highs reaching up to 38°C (101°F) and lows dropping to around 14°C (58°F).

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

July Precipitation in Reston

In Reston in July, the precipitation amount is 141 mm (5.5 in), occurring over the course of 12 days.

July Precipitation Trends in Reston

The chart displays monthly precipitation patterns in Reston, 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 Reston, July typically receives around 141 mm (5.5 inches) of precipitation spread over approximately 12 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 Reston

In Reston in July humidity is 74%. With an average temperature of 27°C (81°F), this humidity feels like a warm, enveloping blanket, making traveling feel both sticky and draining, yet the heat invites you to seek out refreshing dips in pools or shady spots to relax.

July Average Humidity in Reston

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

In Reston in July, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Reston.

Maximum UV Index Levels in Reston for July

The chart shows the monthly maximum UV Index (UVI) for Reston 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 Reston typically reaches 10, which falls under the very high exposure category.

Data source: Reston 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 Reston Compares to Other Months

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

This table compares monthly weather conditions in Reston, showing how July’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	2°C (37°F)	60 mm (2.4 inches)	84%	moderate
February Weather	5°C (41°F)	98 mm (3.9 inches)	83%	moderate
March Weather	8°C (46°F)	84 mm (3.3 inches)	83%	high
April Weather	13°C (57°F)	99 mm (3.9 inches)	81%	very high
May Weather	19°C (66°F)	132 mm (5.2 inches)	78%	very high
June Weather	24°C (75°F)	118 mm (4.7 inches)	79%	very high
July Weather	27°C (81°F)	141 mm (5.5 inches)	74%	very high
August Weather	25°C (77°F)	150 mm (5.9 inches)	72%	very high
September Weather	22°C (72°F)	102 mm (4.0 inches)	75%	very high
October Weather	16°C (62°F)	107 mm (4.2 inches)	81%	high
November Weather	8°C (47°F)	86 mm (3.4 inches)	85%	moderate
December Weather	5°C (41°F)	94 mm (3.7 inches)	84%	moderate