Typical Weather in Helena, MT in September

73° F Avg High

43° F Avg Low

3 Rainy Days

☀️ Temperature Summary

September is a popular time of year to visit, with an inviting climate characterized by warm temperatures. Highs in September are typically around 73°F, which is warmer than usual in Helena. You can expect overnight lows near 43°F most days. Daily high temperatures can range between 79°F and 64°F for the month of September.

The warm, dry temperatures in September make Helena a great destination to relax and soak up the sun.

High Temps Throughout the Year

☔ Rain Summary

You can expect about a 10% chance of rain for any given day in September. It's one of the rainier months of the year for Helena, with total rainfall for the month around 1 inches.