McLean climate

McLean Weather in September

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

Average highs run from 89°F on September 1 to 80°F on September 30, and lows from 64°F to 54°F. Normal precipitation for the month is 2.48 in over about 3 wet days.

September 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.20406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
85°F
Average low
60°F
Precipitation
2.48 in
Record high
104°FSep 6, 1995
Record low
31°FSep 25, 2000
Chance of a freeze
0%
Days of 90°F or more
7.7
Daylight
12 h 54 min to 11 h 50 min
Cloud cover
41%
Humidity
56%
Dew point
54°F
Wind
10.1 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
Sep 189°F64°F103°F 201152°F 199315%0%
Sep 289°F64°F100°F 198250°F 197415%0%
Sep 389°F64°F100°F 197941°F 197415%0%
Sep 488°F63°F103°F 202641°F 197415%0%
Sep 588°F63°F103°F 200047°F 197414%0%
Sep 688°F63°F104°F 199549°F 201114%0%
Sep 788°F63°F104°F 198349°F 198614%0%
Sep 887°F62°F104°F 202348°F 198614%0%
Sep 987°F62°F98°F 198537°F 202013%0%
Sep 1087°F62°F100°F 202637°F 202013%0%
Sep 1186°F61°F102°F 202137°F 202013%0%
Sep 1286°F61°F100°F 200047°F 200713%0%
Sep 1386°F61°F99°F 201142°F 198912%0%
Sep 1486°F60°F101°F 202639°F 198912%0%
Sep 1585°F60°F100°F 202439°F 198912%0%
Sep 1685°F60°F98°F 196545°F 197312%0%
Sep 1785°F59°F97°F 197839°F 196511%0%
Sep 1884°F59°F97°F 197240°F 197111%0%
Sep 1984°F59°F99°F 200540°F 200311%0%
Sep 2084°F58°F98°F 202440°F 200311%0%
Sep 2183°F58°F98°F 202433°F 198311%0%
Sep 2283°F58°F98°F 198033°F 198311%0%
Sep 2383°F57°F95°F 200037°F 199510%0%
Sep 2482°F57°F97°F 197938°F 198910%0%
Sep 2582°F56°F99°F 197931°F 200010%0%
Sep 2682°F56°F97°F 202031°F 200010%0%
Sep 2781°F56°F97°F 202036°F 197010%0%
Sep 2881°F55°F97°F 200937°F 197610%0%
Sep 2981°F55°F95°F 199434°F 198410%0%
Sep 3080°F54°F95°F 196731°F 198410%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).

September 1
sunrise 7:15 AM, sunset 8:09 PM
September 30
sunrise 7:37 AM, sunset 7:27 PM

Every day of September: 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.