Fairfax climate

Fairfax Weather in August

NOAA 1991-2020 normals for Allendale 2 Nw, 9.9 km from Fairfax

Average highs run from 91°F on August 1 to 88°F on August 31, and lows from 70°F to 67°F. Normal precipitation for the month is 5.56 in over about 10 wet days.

August day by day

The normal high and low for each date, and the record, in °F.

Normal daily high and low temperature at Fairfax, in °F, with the record for each date.406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

August at a glance

Average high
89°F
Average low
69°F
Precipitation
5.56 in
Record high
106°FAug 22, 1983
Record low
53°FAug 29, 1986
Chance of a freeze
0%
Days of 90°F or more
18.2
Daylight
13 h 45 min to 12 h 52 min
Cloud cover
57%
Humidity
75%
Dew point
71°F
Wind
4.9 mph

Every day of the month

A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.

DateNormal highNormal lowRecord highRecord lowChance wetChance of snow
Aug 191°F70°F103°F 198661°F 199733%0%
Aug 291°F70°F103°F 199961°F 199733%0%
Aug 391°F70°F99°F 198863°F 200133%0%
Aug 491°F70°F100°F 201159°F 198533%0%
Aug 590°F70°F99°F 201158°F 199833%0%
Aug 690°F70°F98°F 198960°F 199833%0%
Aug 790°F70°F100°F 198158°F 200433%0%
Aug 890°F70°F100°F 200758°F 200433%0%
Aug 990°F70°F101°F 200758°F 199433%0%
Aug 1090°F70°F101°F 200758°F 199433%0%
Aug 1190°F69°F103°F 200761°F 199433%0%
Aug 1290°F69°F100°F 199959°F 198933%0%
Aug 1390°F69°F103°F 199964°F 198933%0%
Aug 1490°F69°F100°F 199962°F 198332%0%
Aug 1589°F69°F101°F 199957°F 198332%0%
Aug 1689°F69°F97°F 199962°F 198332%0%
Aug 1789°F69°F99°F 200763°F 198332%0%
Aug 1889°F69°F99°F 199965°F 198932%0%
Aug 1989°F69°F100°F 199965°F 198432%0%
Aug 2089°F68°F102°F 198365°F 198131%0%
Aug 2189°F68°F103°F 198360°F 199831%0%
Aug 2289°F68°F106°F 198360°F 199831%0%
Aug 2389°F68°F104°F 198360°F 199830%0%
Aug 2489°F68°F103°F 198357°F 199730%0%
Aug 2588°F68°F99°F 198356°F 199730%0%
Aug 2688°F68°F97°F 198258°F 199429%0%
Aug 2788°F67°F97°F 198759°F 199429%0%
Aug 2888°F67°F100°F 199860°F 201428%0%
Aug 2988°F67°F101°F 199853°F 198628%0%
Aug 3088°F67°F102°F 199853°F 198628%0%
Aug 3188°F67°F103°F 199853°F 198628%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Fairfax, in percent, and of at least 0.1 inch of snowfall.0102030401102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (EDT).

August 1
sunrise 6:39 AM, sunset 8:24 PM
August 31
sunrise 6:59 AM, sunset 7:51 PM

Every day of August: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00380126 (Allendale 2 Nw), public domain. Records: NOAA GHCN-Daily, station USC00380126, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.