In August, Janesville typically sees daytime highs of 27.4°C and overnight lows around 15.0°C. Compared to the annual average high of 13.9°C, August runs +13.4°C.
August in Janesville averages a daytime high of 27.4°C and an overnight low of 15.0°C.
August runs +13.4°C compared to Janesville's annual average high of 13.9°C, ranking #2 of 12 months by warmth.
Plan for daytime highs near 27.4°C and cooler evenings around 15.0°C.