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 · Illinois temperature records
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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°/ 40°
💧 8.1"
❄️ 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, IL Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Avg high Avg low
Joliet, IL Monthly Precipitation
Average rainfall and snowfall per month, in inches.
Rain (in) Snow (in)
Joliet, IL Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
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Best Time to Visit Joliet, IL
Joliet, IL has no months that meet our "pleasant" threshold — every season has tradeoffs.
Jan
Feb
Mar
Apr
May
Jun
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Dec
Pleasant (65-82°F, ≤2.5" rain) Mild Less ideal
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
→Holiday Weather in Joliet
Weather Analysis & Trends
RecordsHottest Temperatures Ever Recorded in Every US StateAll 50 state record highs ranked, including Illinois.Severe WeatherTornado Season 2026: Forecasts & What to ExpectAn EF5 already, and the peak still ahead.Climate ForecastEl Niño 2026: What Every US Region Should Expect85% likely by late 2026. Region-by-region impact analysis.