In August, Great Falls typically sees daytime highs of 27.8°C and overnight lows around 10.0°C. Compared to the annual average high of 13.8°C, August runs +14.0°C.
August in Great Falls averages a daytime high of 27.8°C and an overnight low of 10.0°C.
August runs +14.0°C compared to Great Falls's annual average high of 13.8°C, ranking #2 of 12 months by warmth.
Plan for daytime highs near 27.8°C and cooler evenings around 10.0°C.