In July, Arlington Heights typically sees daytime highs of 28.0°C and overnight lows around 17.1°C. Compared to the annual average high of 14.3°C, July runs +13.7°C.
July in Arlington Heights averages a daytime high of 28.0°C and an overnight low of 17.1°C.
July runs +13.7°C compared to Arlington Heights's annual average high of 14.3°C, ranking #1 of 12 months by warmth.
Plan for daytime highs near 28.0°C and cooler evenings around 17.1°C.