Climate averages 1991–2020
Joliet weather
in April.
A mild, wet month: the 7th warmest and the 11th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
April is a mild month in Joliet: daytime highs average 15.4°C and nights cool to about 4.8°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 112 mm of rain on roughly 12 days, which makes April a wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 18 min on an average April day.
The nearest other city in this atlas is Bolingbrook (19 km away). In April its highs average 14.6°C, 0.8°C cooler than Joliet, with 112 mm of rain.
Among the 498 cities listed in the United States, Joliet ranks joint 349th of 498 for the warmest April highs and joint 421st of 498 for the driest April (rainfall, lowest first). The mean April high of those 498 cities is 19.4°C; Joliet is 4.0°C cooler than that mean.
From April to May, average highs rise by 5.9°C to 21.2°C, and monthly rainfall rises from 112 mm to 116 mm.
The annual picture
April in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Joliet climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -0.2°C-8.1°C | -8.1°C | 58 | 8.6 | 9.510 h |
| February | 2.4°C-6.5°C | -6.5°C | 51 | 7.2 | 10.611 h |
| March | 8.7°C-1.2°C | -1.2°C | 72 | 10.2 | 11.912 h |
| April, selected | 15.4°C4.8°C | 4.8°C | 112 | 12.4 | 13.313 h |
| May | 21.2°C11.0°C | 11.0°C | 116 | 12.5 | 14.514 h |
| June | 26.3°C16.6°C | 16.6°C | 110 | 11.7 | 15.115 h |
| July | 28.2°C19.1°C | 19.1°C | 95 | 11.3 | 14.915 h |
| August | 27.4°C18.5°C | 18.5°C | 93 | 10.2 | 13.814 h |
| September | 23.8°C14.5°C | 14.5°C | 75 | 8.3 | 12.513 h |
| October | 16.9°C8.2°C | 8.2°C | 81 | 9.2 | 11.111 h |
| November | 9.1°C1.4°C | 1.4°C | 69 | 8.6 | 9.910 h |
| December | 2.6°C-4.5°C | -4.5°C | 56 | 8.2 | 9.29 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
April in nearby cities
- Bolingbrook in AprilUnited States · 19 kmHigh 14.6°C · Low 4.3°C · 112 mm rain
- Naperville in AprilUnited States · 29 kmHigh 14.4°C · Low 4.2°C · 113 mm rain
- Aurora (Illinois), United States in AprilUnited States · 33 kmHigh 14.7°C · Low 4.2°C · 113 mm rain
- Cicero in AprilUnited States · 45 kmHigh 13.7°C · Low 4.4°C · 114 mm rain
- Hammond in AprilUnited States · 49 kmHigh 13.1°C · Low 4.9°C · 110 mm rain
- Chicago in AprilUnited States · 51 kmHigh 12.3°C · Low 4.4°C · 114 mm rain
- Schaumburg in AprilUnited States · 57 kmHigh 14.0°C · Low 3.8°C · 110 mm rain
- Elgin in AprilUnited States · 59 kmHigh 14.4°C · Low 4.2°C · 114 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Joliet) is explained once on the Joliet year overview and on the Sources, method and limits page.