In October, Arlington Heights typically sees daytime highs of 16.9°C and overnight lows around 6.2°C. Compared to the annual average high of 14.3°C, October runs +2.6°C.
October in Arlington Heights averages a daytime high of 16.9°C and an overnight low of 6.2°C.
October runs +2.6°C compared to Arlington Heights's annual average high of 14.3°C, ranking #6 of 12 months by warmth.
Plan for daytime highs near 16.9°C and cooler evenings around 6.2°C.