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Joliet Weather by Month
Average temperatures, rainfall and humidity for Joliet, United States, month by month, built from OpenWeather's historical records. Use it to see what a typical Joliet month looks like before you travel — then check the live Joliet forecast for the days ahead.
Warmest month
July
29°C average high
Coolest month
January
-7°C average low
Wettest month
June
116 mm of rain
Driest month
February
37 mm of rain
Average temperature and rainfall in Joliet by month
Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.
| Month | Avg high | Avg low | Record low / high | Rainfall | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 0°C | -7°C | -30°C / 16°C | 42 mm | 81% | 14 km/h |
| February | 3°C | -6°C | -26°C / 22°C | 37 mm | 77% | 15 km/h |
| March | 10°C | 0°C | -23°C / 27°C | 72 mm | 72% | 16 km/h |
| April | 16°C | 5°C | -7°C / 30°C | 88 mm | 68% | 16 km/h |
| May | 23°C | 12°C | -1°C / 35°C | 103 mm | 69% | 14 km/h |
| June | 28°C | 17°C | 5°C / 36°C | 116 mm | 70% | 12 km/h |
| July | 29°C | 19°C | 11°C / 36°C | 88 mm | 75% | 10 km/h |
| August | 28°C | 18°C | 10°C / 37°C | 87 mm | 77% | 10 km/h |
| September | 26°C | 15°C | 1°C / 35°C | 72 mm | 74% | 11 km/h |
| October | 18°C | 8°C | -3°C / 32°C | 90 mm | 74% | 13 km/h |
| November | 10°C | 1°C | -17°C / 25°C | 49 mm | 76% | 14 km/h |
| December | 4°C | -3°C | -24°C / 21°C | 48 mm | 81% | 14 km/h |
Best time to visit Joliet
The most comfortable time to visit Joliet is generally May and August to September, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around June, totalling about 893 mm a year.
Travellers who prefer heat should aim for July, when highs average 29°C. June is the month to avoid if rain would spoil your plans — it averages 116 mm, roughly 3× the rainfall of February.
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Joliet forecast for what is happening now.