Typical Weather in Boise, ID in September

79° F Avg High

51° F Avg Low

2 Rainy Days

☀️ Temperature Summary

September is a popular time to visit, with an inviting climate featuring warm temperatures. September is one of the warmer months of the year for Boise, with highs averaging around 79°F. You can expect overnight lows near 51°F most days. Daily high temperatures can range between 84°F and 72°F for the month of September.

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

High Temps Throughout the Year

☔ Rain Summary

You can expect about a 6% chance of rain for any given day in September. It's one of the drier months of the year for Boise, with total rainfall for the month around 1 inches.