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Joliet, IL Climate
1991 to 2020 normals at Joliet Brandon Rd Dam, 2 mi from the center of Joliet, elevation 543 ft.
Average weather by month
Select a month for daily normals and last year's weather
| Month | Range | High | Low | Precip. | Snow |
|---|---|---|---|---|---|
| January | 31° | 17° | 1.99 in | 5.0 in | |
| February | 35° | 20° | 1.78 in | 6.2 in | |
| March | 47° | 29° | 2.27 in | 2.1 in | |
| April | 60° | 39° | 3.93 in | 0.1 in | |
| May | 71° | 49° | 4.53 in | 0.0 in | |
| June | 80° | 60° | 4.30 in | 0.0 in | |
| July | 84° | 64° | 4.55 in | 0.0 in | |
| August | 82° | 63° | 3.97 in | 0.0 in | |
| September | 76° | 55° | 3.17 in | 0.0 in | |
| October | 63° | 43° | 3.14 in | 0.0 in | |
| November | 49° | 32° | 2.46 in | 0.3 in | |
| December | 36° | 22° | 1.94 in | 3.2 in | |
| Year | 60° | 38.03 in | 16.9 in |
Frequently asked questions
- What is the hottest month in Joliet, IL?
- July is the warmest month, with a normal high of 84°F at Joliet Brandon Rd Dam.
- What is the coldest month in Joliet, IL?
- January is the coldest month, with a normal low of 17°F.
- What is the wettest month in Joliet, IL?
- July has the most precipitation on average, about 4.55 inches.