In October, Joliet typically sees daytime highs of 17.9°C and overnight lows around 5.6°C. Compared to the annual average high of 15.3°C, October runs +2.6°C.
October in Joliet averages a daytime high of 17.9°C and an overnight low of 5.6°C.
October runs +2.6°C compared to Joliet's annual average high of 15.3°C, ranking #6 of 12 months by warmth.
Plan for daytime highs near 17.9°C and cooler evenings around 5.6°C.