Climate almanac
Boise
Idaho, United States · 43.61°, -116.20°
What is the weather like in Boise in September?
In September, Boise is typically 83°F (28°C) during the day and 55°F (13°C) at night. The month brings about 0.4 in (9 mm) of precipitation in total.
- Average high83°F (28°C)
- Average low55°F (13°C)
- Precipitation0.4 in (9 mm)
- Clear or mostly clear days20
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)