Fairfax climate

Fairfax Weather in August

NOAA 1991-2020 normals for Ralston, 8.5 km from Fairfax

Average highs run from 95°F on August 1 to 91°F on August 31, and lows from 71°F to 66°F. Normal precipitation for the month is 3.95 in over about 5 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
93°F
Average low
69°F
Precipitation
3.95 in
Record high
112°FAug 2, 2011
Record low
49°FAug 29, 1988
Chance of a freeze
0%
Days of 90°F or more
21.2
Daylight
14 h 00 min to 12 h 59 min
Cloud cover
44%
Humidity
63%
Dew point
66°F
Wind
8.5 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 195°F71°F111°F 201259°F 197318%0%
Aug 295°F71°F112°F 201154°F 200918%0%
Aug 395°F71°F109°F 196455°F 197418%0%
Aug 495°F70°F110°F 196451°F 197418%0%
Aug 595°F70°F112°F 201154°F 194818%0%
Aug 695°F70°F110°F 195159°F 199018%0%
Aug 795°F70°F108°F 195159°F 198918%0%
Aug 895°F70°F109°F 197053°F 198918%0%
Aug 994°F70°F106°F 196856°F 198918%0%
Aug 1094°F70°F105°F 197657°F 196918%0%
Aug 1194°F70°F106°F 199956°F 196718%0%
Aug 1294°F70°F106°F 195650°F 196718%0%
Aug 1394°F69°F108°F 195652°F 196718%0%
Aug 1494°F69°F107°F 195656°F 200218%0%
Aug 1594°F69°F110°F 195650°F 199418%0%
Aug 1694°F69°F109°F 195659°F 199218%0%
Aug 1794°F69°F107°F 195660°F 196918%0%
Aug 1893°F69°F107°F 195658°F 198118%0%
Aug 1993°F68°F106°F 201157°F 195018%0%
Aug 2093°F68°F107°F 202350°F 195618%0%
Aug 2193°F68°F106°F 202352°F 195618%0%
Aug 2293°F68°F103°F 200053°F 194918%0%
Aug 2392°F68°F103°F 197855°F 196118%0%
Aug 2492°F67°F108°F 201156°F 196118%0%
Aug 2592°F67°F106°F 200652°F 201018%0%
Aug 2692°F67°F107°F 199952°F 196218%0%
Aug 2792°F67°F107°F 200050°F 196718%0%
Aug 2891°F66°F106°F 200055°F 198618%0%
Aug 2991°F66°F109°F 195149°F 198818%0%
Aug 3091°F66°F109°F 195153°F 200918%0%
Aug 3191°F66°F108°F 195150°F 200918%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.051015201102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (CDT).

August 1
sunrise 6:33 AM, sunset 8:33 PM
August 31
sunrise 6:57 AM, sunset 7:56 PM

Every day of August: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00347390 (Ralston), public domain. Records: NOAA GHCN-Daily, station USW00013969, 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 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.