In August, Iowa City typically sees daytime highs of 28.7°C and overnight lows around 16.2°C. Compared to the annual average high of 15.4°C, August runs +13.3°C.
August in Iowa City averages a daytime high of 28.7°C and an overnight low of 16.2°C.
August runs +13.3°C compared to Iowa City's annual average high of 15.4°C, ranking #2 of 12 months by warmth.
Plan for daytime highs near 28.7°C and cooler evenings around 16.2°C.