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Monthly climate in Reston, Virginia, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Reston features a humid subtropical climate (Cfa).Temperatures typically range between 2 °C (37 °F) and 27 °C (81 °F) through the year, but rarely can drop to -16 °C (3 °F) or can rise to as high as 38 °C (101 °F).The average annual precipitation amounts to about 1271 mm (50.0 inches) and receives 129 rainy days on the 1 mm (0.04 inches) threshold annually.Reston enjoys an average of 3077 hours of sunshine throughout the year, and daylight varies from 9 hours 27 minutes to 14 hours 50 minutes per day.

Monthly average temperatures in Reston, Virginia, United States §

The warmest months in Reston are June, July and August, with daily mean temperatures ranging from 24 to 27 °C (75 - 81 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 2 to 5 °C (37 - 41 °F) throughout the day. On average each year, Reston experiences 112 days above 25 °C (77.0 °F) and 64 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Reston, Virginia, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 21°C
(70°F)		 27°C
(81°F)		 27°C
(81°F)		 32°C
(90°F)		 34°C
(94°F)		 36°C
(98°F)		 38°C
(101°F)		 37°C
(100°F)		 36°C
(97°F)		 36°C
(96°F)		 25°C
(77°F)		 20°C
(68°F)
Mean maximum 18°C
(64°F)		 22°C
(71°F)		 26°C
(78°F)		 29°C
(84°F)		 33°C
(91°F)		 35°C
(96°F)		 37°C
(98°F)		 35°C
(95°F)		 33°C
(92°F)		 30°C
(87°F)		 24°C
(75°F)		 18°C
(65°F)
Average high 6°C
(44°F)		 10°C
(49°F)		 13°C
(56°F)		 19°C
(66°F)		 24°C
(75°F)		 29°C
(84°F)		 32°C
(90°F)		 30°C
(86°F)		 27°C
(81°F)		 21°C
(71°F)		 13°C
(56°F)		 9°C
(48°F)
Daily mean 2°C
(37°F)		 5°C
(41°F)		 8°C
(46°F)		 13°C
(57°F)		 19°C
(66°F)		 24°C
(75°F)		 27°C
(81°F)		 25°C
(77°F)		 22°C
(72°F)		 16°C
(62°F)		 8°C
(47°F)		 5°C
(41°F)
Average low -1°C
(30°F)		 0°C
(33°F)		 3°C
(38°F)		 8°C
(47°F)		 14°C
(57°F)		 19°C
(66°F)		 22°C
(72°F)		 21°C
(70°F)		 17°C
(64°F)		 12°C
(54°F)		 3°C
(39°F)		 1°C
(33°F)
Mean minimum -10°C
(14°F)		 -9°C
(16°F)		 -6°C
(22°F)		 -0°C
(32°F)		 5°C
(41°F)		 12°C
(55°F)		 17°C
(63°F)		 16°C
(60°F)		 10°C
(50°F)		 3°C
(38°F)		 -4°C
(25°F)		 -7°C
(20°F)
Minimum -15°C
(6°F)		 -16°C
(3°F)		 -7°C
(19°F)		 -2°C
(29°F)		 2°C
(36°F)		 10°C
(49°F)		 14°C
(58°F)		 14°C
(58°F)		 6°C
(42°F)		 0°C
(32°F)		 -5°C
(23°F)		 -11°C
(13°F)

Compare climate in Reston with other places

Compare temperature, precipitation, sunshine, UV index in Reston, Virginia, United States with other places around the world.

Monthly average precipitation in Reston, Virginia, United States §

Reston usually has the most precipitation in May, July and August, with an average of 13 rainy days and 141 mm (5.5 inches) of precipitation per month.The driest months in Reston are January, March and November. On average, 77 mm (3.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Reston, Virginia, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 60 (2.4) 98 (3.9) 84 (3.3) 99 (3.9) 132 (5.2) 118 (4.7) 141 (5.5) 150 (5.9) 102 (4.0) 107 (4.2) 86 (3.4) 94 (3.7)
Average precipitation days (≥ 1 mm) 7 11 10 11 13 12 12 16 11 10 7 9

Monthly sunshine hours in Reston, Virginia, United States §

The sunniest months in Reston are June, July and August, when the sun shines an average of 10 hours 57 minutes a day.Least sunny months in Reston: January, February and December receive an average of 5 hours 43 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Reston, Virginia, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 149 180 258 259 281 330 356 320 277 246 226 191
Mean daily daylight hours 9h 46m 10h 44m 11h 58m 13h 14m 14h 19m 14h 50m 14h 33m 13h 36m 12h 23m 11h 7m 10h 1m 9h 27m

Solar UV radiation in Reston, Virginia, United States §

Reston experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 10 - 10, which corresponds to the Very High category of sun exposure.January, February and December are in the Moderate exposure category. In these months, the maximum values of the UV index do not exceed 5. For more detailed information, check out our hourly Reston UV Index data.

Average daily maximum UV levels by month for Reston, Virginia, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 3 5 7 9 10 10 10 9 8 7 5 3