Typical Weather

Boise · United States

Weather in Boise in September

In September the typical daytime high in Boise is 26.8 °C on average, from 30.1 °C at the start to 23.9 °C at the end of the month.

The last 10 years were 0.6 °C cooler than more than 40 years ago.

Click a day for more: afternoon and night, the usual range, records and how fast it is warming.

Measured at the weather station Payette, 78 km away.