Joliet weather by month
Average highs run from 31°F in January to 84°F in July, and January nights average 17°F. It gets 38 inches of rain and melted snow a year and 17 inches of snow. Nights drop below freezing about 126 times a year. The most comfortable months are June and August to October.
Best time to visit Joliet
For comfortable weather, go in June and August to October. In those months the average high stays between 62°F and 86°F, nights average 42°F or warmer, and rain stays under 4.5 inches for the month.
Month by month
| Month | High | Low | Precip. | Snow | Wet days | Days 90°F+ | Nights below 32°F | Feels |
|---|---|---|---|---|---|---|---|---|
| January | 31°F | 17°F | 2.0 in | 5.0 in | 5 | 0 | 28 | very cold |
| February | 35°F | 20°F | 1.8 in | 6.2 in | 5 | 0 | 25 | cold |
| March | 47°F | 29°F | 2.3 in | 2.1 in | 5 | 0 | 21 | cold |
| April | 60°F | 39°F | 3.9 in | 0.1 in | 7 | 0 | 6 | cool |
| May | 71°F | 49°F | 4.5 in | 0.0 in | 8 | 1 | 0 | mild |
| June | 80°F | 60°F | 4.3 in | 0.0 in | 7 | 4 | 0 | warm |
| July | 84°F | 64°F | 4.6 in | 0.0 in | 6 | 6 | 0 | warm |
| August | 82°F | 63°F | 4.0 in | 0.0 in | 6 | 3 | 0 | warm |
| September | 76°F | 55°F | 3.2 in | 0.0 in | 5 | 2 | 0 | warm |
| October | 63°F | 43°F | 3.1 in | 0.0 in | 6 | 0 | 3 | mild |
| November | 49°F | 32°F | 2.5 in | 0.3 in | 5 | 0 | 16 | cool |
| December | 36°F | 22°F | 1.9 in | 3.2 in | 5 | 0 | 26 | cold |
| Year | 60°F avg | 41°F avg | 38.0 in | 16.9 in | 70 | 15 | 126 |
"Wet days" are days with at least 0.1 inch of precipitation. "Feels" is a plain-language label for the average high. Normals for 1991-2020 from NOAA NCEI, station Joliet Brandon Rd Dam, IL (USC00114530), 2.8 miles from the city center. Averages describe typical conditions, not a forecast.
Sunrise, sunset and daylight in Joliet
The shortest day is December 21, with 9h 10m of daylight; the longest is June 21, with 15h 11m. The earliest sunset comes around December 6 (4:21 pm) and the latest around June 26 (8:30 pm). The sun sets after 8 pm on 90 days a year.
| On the 15th of | Sunrise | Sunset | Daylight |
|---|---|---|---|
| January | 7:16 am | 4:47 pm | 9h 31m |
| February | 6:47 am | 5:25 pm | 10h 38m |
| March | 7:04 am | 6:58 pm | 11h 55m |
| April | 6:12 am | 7:32 pm | 13h 20m |
| May | 5:33 am | 8:04 pm | 14h 31m |
| June | 5:17 am | 8:27 pm | 15h 10m |
| July | 5:31 am | 8:24 pm | 14h 52m |
| August | 6:01 am | 7:51 pm | 13h 50m |
| September | 6:32 am | 7:01 pm | 12h 28m |
| October | 7:04 am | 6:10 pm | 11h 06m |
| November | 6:41 am | 4:31 pm | 9h 51m |
| December | 7:12 am | 4:22 pm | 9h 11m |
Calculated for 2026 at the center of Joliet with NOAA's solar equations, in local clock time (Central Time, including daylight saving time where it applies). Times shift by a minute or two from year to year.
Is Joliet getting warmer?
The last 10 years averaged 2.2°F warmer than the 20th century. See the climate stripes for Joliet.Frequently asked questions
What is the warmest month in Joliet?
July is the warmest month, with an average high of 84°F and an average low of 64°F (NOAA 1991-2020 normals).
What is the coldest month in Joliet?
January is the coldest, with average lows of 17°F and highs of 31°F.
What is the rainiest month in Joliet?
July gets the most precipitation, 4.6 inches on average. February is the driest at 1.8 inches.
Does it snow in Joliet?
Yes. Joliet averages 17 inches of snow a year.
When is the best time to visit Joliet?
For comfortable weather, June and August to October. Those months average highs between 62 and 86°F with lows of 42°F or more and modest rain.
Thinking of moving to Joliet?
See what homes, rent and everyday prices cost, who lives there and how it compares with nearby cities on the full Joliet profile.
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