McLean climate

McLean Weather in August

NOAA 1991-2020 normals for Dalecarlia Rsvr, 5.5 km from McLean

Average highs run from 88°F on August 1 to 84°F on August 31, and lows from 68°F to 64°F. Normal precipitation for the month is 4.42 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 McLean, in °F, with the record for each date.406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

August at a glance

Average high
86°F
Average low
66°F
Precipitation
4.42 in
Record high
105°FAug 17, 1997
Record low
49°FAug 29, 1986
Chance of a freeze
0%
Days of 90°F or more
11.2
Daylight
14 h 10 min to 13 h 04 min
Cloud cover
55%
Humidity
69%
Dew point
64°F
Wind
6.7 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 188°F68°F100°F 201164°F 196632%0%
Aug 288°F68°F100°F 200262°F 194732%0%
Aug 388°F68°F101°F 200661°F 195932%0%
Aug 487°F68°F99°F 198763°F 195832%0%
Aug 587°F68°F98°F 201259°F 195132%0%
Aug 687°F68°F96°F 195556°F 199432%0%
Aug 787°F67°F97°F 201158°F 199432%0%
Aug 887°F67°F102°F 200758°F 198932%0%
Aug 987°F67°F97°F 194157°F 198932%0%
Aug 1087°F67°F98°F 194360°F 197232%0%
Aug 1187°F67°F100°F 198057°F 197232%0%
Aug 1287°F67°F99°F 201659°F 196232%0%
Aug 1387°F67°F101°F 201658°F 194132%0%
Aug 1487°F67°F100°F 201655°F 194132%0%
Aug 1587°F67°F103°F 198851°F 196331%0%
Aug 1686°F67°F102°F 199757°F 197231%0%
Aug 1786°F66°F105°F 199758°F 194131%0%
Aug 1886°F66°F98°F 200258°F 198131%0%
Aug 1986°F66°F98°F 200258°F 195331%0%
Aug 2086°F66°F101°F 198356°F 196431%0%
Aug 2186°F66°F96°F 195958°F 194931%0%
Aug 2286°F66°F99°F 198355°F 195630%0%
Aug 2386°F66°F97°F 196856°F 195230%0%
Aug 2485°F65°F98°F 196854°F 195230%0%
Aug 2585°F65°F97°F 196856°F 194230%0%
Aug 2685°F65°F97°F 194853°F 194230%0%
Aug 2785°F65°F100°F 198756°F 194430%0%
Aug 2885°F65°F101°F 202454°F 198630%0%
Aug 2984°F64°F98°F 195349°F 198629%0%
Aug 3084°F64°F99°F 195350°F 198629%0%
Aug 3184°F64°F100°F 195353°F 194629%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at McLean, 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 6:10 AM, sunset 8:20 PM
August 31
sunrise 6:37 AM, sunset 7:41 PM

Every day of August: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00182325 (Dalecarlia Rsvr), public domain. Records: NOAA GHCN-Daily, station USW00013743, 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.