In October, Naperville typically sees daytime highs of 17.3°C and overnight lows around 5.3°C. Compared to the annual average high of 14.7°C, October runs +2.5°C.
October in Naperville averages a daytime high of 17.3°C and an overnight low of 5.3°C.
October runs +2.5°C compared to Naperville's annual average high of 14.7°C, ranking #6 of 12 months by warmth.
Plan for daytime highs near 17.3°C and cooler evenings around 5.3°C.