Joliet Climate: Weather by Month and Best Time to Visit
Best months for Joliet: September, August, July, June.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | 0°C | -7°C | 57 mm | 9 | – | – | 3.9 |
| February | 3°C | -5°C | 51 mm | 7 | – | – | 4.5 |
| March | 9°C | 0°C | 72 mm | 10 | – | – | 5.5 |
| April | 16°C | 5°C | 111 mm | 13 | – | – | 6.3 |
| May | 22°C | 12°C | 117 mm | 13 | – | – | 7.2 |
| June | 27°C | 17°C | 110 mm | 12 | – | – | 7.4 |
| July | 29°C | 19°C | 96 mm | 11 | – | – | 7.5 |
| August | 28°C | 18°C | 93 mm | 10 | – | – | 7.7 |
| September | 24°C | 14°C | 75 mm | 8 | – | – | 8.0 |
| October | 18°C | 7°C | 81 mm | 9 | – | – | 7.1 |
| November | 10°C | 1°C | 69 mm | 8 | – | – | 5.9 |
| December | 3°C | -4°C | 57 mm | 9 | – | – | 4.5 |