Mattoon climate

Mattoon Weather in August

NOAA 1991-2020 normals for Mattoon, 2 km from Mattoon

Average highs run from 86°F on August 1 to 83°F on August 31, and lows from 67°F to 62°F. Normal precipitation for the month is 2.85 in over about 8 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 Mattoon, in °F, with the record for each date.406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

August at a glance

Average high
85°F
Average low
65°F
Precipitation
2.85 in
Record high
99°FAug 2, 2012
Record low
47°FAug 12, 2004
Chance of a freeze
0%
Days of 90°F or more
6.5
Daylight
14 h 13 min to 13 h 05 min
Cloud cover
48%
Humidity
73%
Dew point
64°F
Wind
7.4 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 186°F67°F94°F 200655°F 201926%0%
Aug 285°F67°F99°F 201255°F 202125%0%
Aug 385°F66°F94°F 201053°F 202525%0%
Aug 485°F66°F96°F 201055°F 200725%0%
Aug 585°F66°F92°F 200250°F 200925%0%
Aug 685°F66°F91°F 200649°F 200425%0%
Aug 785°F66°F95°F 200751°F 200425%0%
Aug 885°F66°F96°F 201254°F 200225%0%
Aug 985°F66°F94°F 200554°F 201725%0%
Aug 1085°F66°F96°F 201055°F 202425%0%
Aug 1185°F66°F96°F 201050°F 200425%0%
Aug 1285°F66°F98°F 200747°F 200425%0%
Aug 1385°F66°F95°F 201050°F 200425%0%
Aug 1485°F66°F93°F 201049°F 200125%0%
Aug 1585°F66°F96°F 200747°F 201125%0%
Aug 1685°F66°F94°F 202550°F 200425%0%
Aug 1785°F65°F94°F 200055°F 201025%0%
Aug 1885°F65°F92°F 202551°F 200725%0%
Aug 1984°F65°F92°F 202553°F 202024%0%
Aug 2084°F65°F91°F 201053°F 201224%0%
Aug 2184°F65°F95°F 200350°F 202424%0%
Aug 2284°F65°F95°F 200750°F 202424%0%
Aug 2384°F64°F97°F 200752°F 202424%0%
Aug 2484°F64°F99°F 202353°F 201524%0%
Aug 2584°F64°F99°F 202352°F 202524%0%
Aug 2684°F64°F95°F 200350°F 202524%0%
Aug 2784°F63°F95°F 200350°F 202524%0%
Aug 2884°F63°F94°F 200755°F 200724%0%
Aug 2983°F63°F97°F 200752°F 200924%0%
Aug 3083°F62°F95°F 201348°F 200924%0%
Aug 3183°F62°F95°F 201348°F 202324%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Mattoon, in percent, and of at least 0.1 inch of snowfall.01020301102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (CDT).

August 1
sunrise 5:53 AM, sunset 8:06 PM
August 31
sunrise 6:21 AM, sunset 7:26 PM

Every day of August: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00115430 (Mattoon), public domain. Records: NOAA GHCN-Daily, station USW00053802, 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.