Romeoville climate

Romeoville Weather in August

NOAA 1991-2020 normals for Romeoville WFO, 4.9 km from Romeoville

Average highs run from 84°F on August 1 to 81°F on August 31, and lows from 64°F to 61°F. Normal precipitation for the month is 4.36 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 Romeoville, in °F, with the record for each date.406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

August at a glance

Average high
83°F
Average low
63°F
Precipitation
4.36 in
Record high
97°FAug 1, 2006
Record low
47°FAug 31, 2009
Chance of a freeze
0%
Days of 90°F or more
3.1
Daylight
14 h 23 min to 13 h 10 min
Cloud cover
51%
Humidity
74%
Dew point
63°F
Wind
7.6 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 184°F64°F97°F 200658°F 199832%0%
Aug 284°F64°F94°F 200655°F 200932%0%
Aug 384°F64°F96°F 201254°F 200032%0%
Aug 484°F64°F95°F 201254°F 200032%0%
Aug 584°F64°F92°F 201851°F 202032%0%
Aug 684°F64°F93°F 202253°F 200432%0%
Aug 784°F64°F94°F 200152°F 200432%0%
Aug 884°F64°F93°F 200152°F 201731%0%
Aug 984°F64°F95°F 200152°F 199931%0%
Aug 1083°F64°F92°F 201053°F 202431%0%
Aug 1183°F64°F93°F 200251°F 200431%0%
Aug 1283°F64°F93°F 201049°F 200432%0%
Aug 1383°F64°F92°F 201051°F 200432%0%
Aug 1483°F64°F89°F 202050°F 200432%0%
Aug 1583°F63°F90°F 202548°F 200432%0%
Aug 1683°F63°F92°F 202550°F 200432%0%
Aug 1783°F63°F87°F 199955°F 201232%0%
Aug 1883°F63°F86°F 202153°F 200232%0%
Aug 1983°F63°F88°F 201956°F 200031%0%
Aug 2082°F63°F91°F 201052°F 200231%0%
Aug 2182°F63°F94°F 200351°F 200431%0%
Aug 2282°F63°F89°F 200751°F 200431%0%
Aug 2382°F62°F94°F 202354°F 200531%0%
Aug 2482°F62°F96°F 202353°F 201531%0%
Aug 2582°F62°F93°F 201250°F 201731%0%
Aug 2682°F62°F95°F 202452°F 202531%0%
Aug 2781°F62°F96°F 202450°F 201531%0%
Aug 2881°F61°F93°F 202057°F 201530%0%
Aug 2981°F61°F93°F 201054°F 202530%0%
Aug 3081°F61°F95°F 201351°F 200430%0%
Aug 3181°F61°F93°F 200047°F 200930%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Romeoville, 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 (CDT).

August 1
sunrise 5:47 AM, sunset 8:10 PM
August 31
sunrise 6:17 AM, sunset 7:27 PM

Every day of August: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00117457 (Romeoville WFO), public domain. Records: NOAA GHCN-Daily, station USC00117457, 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.