In April, Joliet typically sees daytime highs of 15.8°C and overnight lows around 3.7°C. Compared to the annual average high of 15.3°C, April runs +0.5°C.
April in Joliet averages a daytime high of 15.8°C and an overnight low of 3.7°C.
April runs +0.5°C compared to Joliet's annual average high of 15.3°C, ranking #7 of 12 months by warmth.
Plan for daytime highs near 15.8°C and cooler evenings around 3.7°C.