In July, Mount Vernon typically sees daytime highs of 28.8°C and overnight lows around 18.4°C. Compared to the annual average high of 16.1°C, July runs +12.7°C.
July in Mount Vernon averages a daytime high of 28.8°C and an overnight low of 18.4°C.
July runs +12.7°C compared to Mount Vernon's annual average high of 16.1°C, ranking #1 of 12 months by warmth.
Plan for daytime highs near 28.8°C and cooler evenings around 18.4°C.