In October, Great Falls typically sees daytime highs of 15.6°C and overnight lows around 0.7°C. Compared to the annual average high of 13.8°C, October runs +1.9°C.
October in Great Falls averages a daytime high of 15.6°C and an overnight low of 0.7°C.
October runs +1.9°C compared to Great Falls's annual average high of 13.8°C, ranking #6 of 12 months by warmth.
Plan for daytime highs near 15.6°C and cooler evenings around 0.7°C.