Historical Weather in Joliet, IL
See 55+ years of weather history for any date in Joliet going back to 1970.
Part of Illinois weather history
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Today in Joliet Weather HistorySee records, averages, and 55+ years of data for today's date
→Monthly Climate Averages
Historical temperature and precipitation averages for Joliet, IL, based on 55+ years of weather data.
Warmest MonthJulyAvg High: 84°F / Low: 64°F
Coldest MonthJanuaryAvg High: 31°F / Low: 15°F
Jan
31°/ 15°
💧 4.6"
❄️ 1.4"
Feb
36°/ 19°
💧 5.2"
❄️ 1.5"
Mar
48°/ 30°
💧 6.3"
❄️ 1.3"
Apr
61°/ 39°
💧 8.2"
❄️ 1.0"
May
72°/ 50°
💧 9.0"
Jun
81°/ 60°
💧 10.4"
Jul
84°/ 64°
💧 11.3"
Aug
83°/ 63°
💧 11.3"
Sep
77°/ 55°
💧 10.1"
Oct
64°/ 43°
💧 8.4"
❄️ 0.8"
Nov
49°/ 32°
💧 6.4"
❄️ 1.0"
Dec
37°/ 22°
💧 5.5"
❄️ 1.2"
Temperatures in Fahrenheit. Precipitation and snowfall in inches.
Joliet Temperature Records
- Record High: The hottest temperature ever recorded in Joliet, IL is 104°F, set on June 26, 1988.
- Record Low: The coldest temperature ever recorded in Joliet, IL is -27°F, set on January 20, 1985.
- Data Coverage: Based on 56 years of data from NOAA weather station: JOLIET.
All-Time Record High
104°F
June 26, 1988
All-Time Record Low
-27°F
January 20, 1985
Monthly Temperature Records in Joliet
| Month | Record High | Record Low |
|---|---|---|
| January | 65°F(1997) | -27°F(1985) |
| February | 73°F(2000) | -21°F(2019) |
| March | 86°F(1986) | -13°F(2002) |
| April | 92°F(1986) | 9°F(1982) |
| May | 102°F(2018) | 26°F(2005) |
| June | 104°F(1988) | 35°F(1985) |
| July | 104°F(2020) | 45°F(1972) |
| August | 103°F(1988) | 39°F(1986) |
| September | 100°F(2017) | 29°F(1995) |
| October | 92°F(1971) | 17°F(1976) |
| November | 80°F(2020) | -2°F(1977) |
| December | 72°F(2012) | -21°F(1983) |
Joliet Snow RecordsSee the top 10 snowiest days ever recorded
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