In July, Joliet typically sees daytime highs of 29.1°C and overnight lows around 16.9°C. Compared to the annual average high of 15.3°C, July runs +13.8°C.
July in Joliet averages a daytime high of 29.1°C and an overnight low of 16.9°C.
July runs +13.8°C compared to Joliet's annual average high of 15.3°C, ranking #1 of 12 months by warmth.
Plan for daytime highs near 29.1°C and cooler evenings around 16.9°C.