In September, Billings typically sees daytime highs of 23.2°C and overnight lows around 6.2°C. Compared to the annual average high of 15.1°C, September runs +8.1°C.
September in Billings averages a daytime high of 23.2°C and an overnight low of 6.2°C.
September runs +8.1°C compared to Billings's annual average high of 15.1°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 23.2°C and cooler evenings around 6.2°C.