Joliet climate

Joliet Weather in August

NOAA 1991-2020 normals for Joliet, 3.4 km from Joliet

Average highs run from 87°F on August 1 to 80°F on August 31, and lows from 51°F to 44°F. Normal precipitation for the month is 0.88 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 Joliet, in °F, with the record for each date.20406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

August at a glance

Average high
84°F
Average low
48°F
Precipitation
0.88 in
Record high
109°FAug 1, 2026
Record low
36°FAug 23, 2015
Chance of a freeze
10%
Days of 90°F or more
11.4
Daylight
14 h 44 min to 13 h 19 min
Cloud cover
48%
Humidity
44%
Dew point
45°F
Wind
7.2 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 187°F51°F109°F 202647°F 200119%0%
Aug 287°F51°F106°F 202447°F 200119%0%
Aug 387°F51°F105°F 200150°F 200619%0%
Aug 487°F51°F105°F 202246°F 202619%0%
Aug 587°F51°F98°F 200543°F 201219%0%
Aug 687°F50°F100°F 200152°F 201819%0%
Aug 787°F50°F104°F 200151°F 201719%0%
Aug 886°F50°F101°F 202150°F 200419%0%
Aug 986°F50°F100°F 200048°F 200219%0%
Aug 1086°F50°F101°F 201849°F 200118%0%
Aug 1186°F49°F104°F 201844°F 200418%0%
Aug 1286°F49°F103°F 201846°F 200418%0%
Aug 1385°F49°F104°F 200348°F 200218%0%
Aug 1485°F49°F101°F 201541°F 200518%0%
Aug 1585°F48°F104°F 202344°F 200518%0%
Aug 1685°F48°F103°F 202144°F 200218%0%
Aug 1784°F48°F104°F 202038°F 200218%0%
Aug 1884°F48°F102°F 202345°F 200218%0%
Aug 1984°F47°F103°F 202543°F 200218%0%
Aug 2084°F47°F97°F 202645°F 201618%0%
Aug 2183°F47°F102°F 201047°F 200018%0%
Aug 2283°F47°F99°F 201146°F 200018%0%
Aug 2383°F46°F100°F 202636°F 201519%0%
Aug 2482°F46°F99°F 202044°F 201019%0%
Aug 2582°F46°F103°F 200842°F 200519%0%
Aug 2682°F45°F101°F 201043°F 201219%0%
Aug 2781°F45°F99°F 201146°F 200519%0%
Aug 2881°F45°F100°F 201245°F 200419%0%
Aug 2981°F45°F99°F 202344°F 201819%0%
Aug 3080°F44°F99°F 200746°F 200319%0%
Aug 3180°F44°F100°F 201644°F 200019%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Joliet, 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 (MDT).

August 1
sunrise 6:00 AM, sunset 8:44 PM
August 31
sunrise 6:36 AM, sunset 7:55 PM

Every day of August: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00244506 (Joliet), public domain. Records: NOAA GHCN-Daily, station USC00240801, 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.