Highest September Temperatures in Boise
A list of the highest temperatures ever recorded in the month of
September in
Boise, Idaho from 1911–2024.
What's the hottest it has ever gotten in Boise in September?
The hottest September temperature in Boise, Idaho history was 105 °F which occurred on September 4, 1924.
| Rank |
Temperature |
Date |
| 1 |
105 °F |
September 4, 1924 |
| 2 |
104 °F |
September 7, 2022 |
| 3 |
102 °F |
September 3, 2022 |
| 3 |
102 °F |
September 4, 2020 |
| 3 |
102 °F |
September 1, 1945 |
| 6 |
101 °F |
September 6, 2022 |
| 6 |
101 °F |
September 2, 2022 |
| 6 |
101 °F |
September 3, 2007 |
| 6 |
101 °F |
September 14, 2000 |
| 6 |
101 °F |
September 1, 1987 |
| 6 |
101 °F |
September 2, 1950 |
| 6 |
101 °F |
September 7, 1924 |
| 13 |
100 °F |
September 5, 2020 |
| 13 |
100 °F |
September 3, 1998 |
| 13 |
100 °F |
September 1, 1976 |
| 13 |
100 °F |
September 5, 1963 |
| 13 |
100 °F |
September 4, 1931 |
| 13 |
100 °F |
September 3, 1931 |
| 19 |
99 °F |
September 5, 2019 |
| 19 |
99 °F |
September 3, 2017 |
| 19 |
99 °F |
September 4, 1998 |
| 19 |
99 °F |
September 2, 1998 |
| 19 |
99 °F |
September 22, 1966 |