Typical September weather
Boise
Idaho · September
80° days
53° nights
maybe one rainy day · 12½ hours of daylight
What to pack
- Light jacket
- Sunscreen
What September feels like
Warm afternoons, genuinely cool nights, and the peaches and the Sunnyslope wineries an hour west hitting their peak all at once. Football Saturdays turn downtown blue and orange, and the hotel rates follow suit.
Real rain shows up maybe one day all month; the rest stay dry. The air runs dry — whatever the thermometer says, it wears easy.
The numbers
| Typical high | 80° |
|---|---|
| Typical low | 53° |
| Days with real rain | 1 |
| Total rain | 0.4 in |
| Humidity | dry air |
| Sunrise / sunset (mid-month) | 7:24 am / 7:55 pm |