Lowest September Temperatures in Boise
A list of the lowest temperatures ever recorded in the month of
September in
Boise, Idaho from 1911–2024.
What's the coldest it has ever gotten in Boise in September?
The coldest September temperature in Boise, Idaho history was 22 °F which occurred on September 24, 1926.
| Rank |
Temperature |
Date |
| 1 |
22 °F |
September 24, 1926 |
| 2 |
23 °F |
September 14, 1970 |
| 2 |
23 °F |
September 26, 1934 |
| 2 |
23 °F |
September 25, 1926 |
| 5 |
24 °F |
September 17, 1965 |
| 5 |
24 °F |
September 26, 1926 |
| 7 |
27 °F |
September 18, 1965 |
| 7 |
27 °F |
September 29, 1954 |
| 7 |
27 °F |
September 26, 1929 |
| 7 |
27 °F |
September 14, 1915 |
| 11 |
28 °F |
September 18, 1988 |
| 11 |
28 °F |
September 24, 1984 |
| 11 |
28 °F |
September 25, 1972 |
| 11 |
28 °F |
September 22, 1929 |
| 11 |
28 °F |
September 27, 1926 |
| 11 |
28 °F |
September 23, 1926 |
| 11 |
28 °F |
September 13, 1914 |
| 18 |
29 °F |
September 23, 1984 |
| 18 |
29 °F |
September 30, 1954 |
| 18 |
29 °F |
September 16, 1936 |
| 18 |
29 °F |
September 29, 1929 |
| 18 |
29 °F |
September 28, 1929 |
| 18 |
29 °F |
September 15, 1927 |
| 18 |
29 °F |
September 8, 1927 |
| 18 |
29 °F |
September 18, 1926 |
| 18 |
29 °F |
September 26, 1924 |
| 18 |
29 °F |
September 28, 1922 |
| 18 |
29 °F |
September 13, 1921 |
| 18 |
29 °F |
September 21, 1914 |
| 18 |
29 °F |
September 25, 1913 |