McLean climate

McLean Weather in August

NOAA 1991-2020 normals for Mc Lean, 0.8 km from McLean

Average highs run from 93°F on August 1 to 89°F on August 31, and lows from 67°F to 64°F. Normal precipitation for the month is 3.18 in over about 6 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
91°F
Average low
66°F
Precipitation
3.18 in
Record high
109°FAug 9, 2011
Record low
47°FAug 25, 2010
Chance of a freeze
0%
Days of 90°F or more
19.1
Daylight
13 h 55 min to 12 h 56 min
Cloud cover
45%
Humidity
53%
Dew point
60°F
Wind
9.4 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 193°F67°F105°F 201256°F 201418%0%
Aug 293°F67°F106°F 201258°F 196518%0%
Aug 393°F67°F107°F 201256°F 197418%0%
Aug 493°F67°F107°F 201256°F 197418%0%
Aug 593°F67°F103°F 200354°F 197818%0%
Aug 693°F67°F105°F 201155°F 197818%0%
Aug 792°F67°F104°F 196452°F 199018%0%
Aug 892°F67°F105°F 202455°F 199718%0%
Aug 992°F67°F109°F 201157°F 198918%0%
Aug 1092°F67°F103°F 202556°F 196718%0%
Aug 1192°F67°F103°F 196452°F 196818%0%
Aug 1292°F67°F104°F 202652°F 196818%0%
Aug 1392°F66°F105°F 202655°F 197919%0%
Aug 1492°F66°F105°F 202653°F 201619%0%
Aug 1592°F66°F104°F 202654°F 200219%0%
Aug 1692°F66°F103°F 202654°F 199419%0%
Aug 1792°F66°F102°F 202455°F 199418%0%
Aug 1891°F66°F103°F 197858°F 199218%0%
Aug 1991°F66°F105°F 202653°F 199218%0%
Aug 2091°F66°F103°F 202353°F 199218%0%
Aug 2191°F66°F105°F 202655°F 201518%0%
Aug 2291°F66°F107°F 202657°F 199418%0%
Aug 2391°F65°F105°F 202651°F 196618%0%
Aug 2491°F65°F107°F 202654°F 196617%0%
Aug 2590°F65°F106°F 201147°F 201017%0%
Aug 2690°F65°F103°F 202647°F 201017%0%
Aug 2790°F65°F103°F 201150°F 201017%0%
Aug 2890°F65°F103°F 201151°F 199217%0%
Aug 2990°F65°F106°F 202050°F 198816%0%
Aug 3089°F64°F103°F 202650°F 198816%0%
Aug 3189°F64°F105°F 201153°F 196716%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.051015201102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (CDT).

August 1
sunrise 6:51 AM, sunset 8:46 PM
August 31
sunrise 7:14 AM, sunset 8:10 PM

Every day of August: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00415770 (Mc Lean), public domain. Records: NOAA GHCN-Daily, station USC00416776, 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.