Lowest September Temperatures in Idaho Falls

A list of the lowest temperatures ever recorded in the month of September in Idaho Falls, Idaho from 1948–2024.
What's the coldest it has ever gotten in Idaho Falls in September?
The coldest September temperature in Idaho Falls, Idaho history was 18 °F which has occurred 5 times, most recently on September 24, 2000.
Rank Temperature Date
1 18 °F September 24, 2000
1 18 °F September 28, 1999
1 18 °F September 30, 1985
1 18 °F September 29, 1985
1 18 °F September 20, 1983
6 21 °F September 29, 1999
6 21 °F September 28, 1985
6 21 °F September 25, 1970
6 21 °F September 18, 1965
10 22 °F September 21, 1983
10 22 °F September 19, 1965
12 23 °F September 23, 1985
12 23 °F September 29, 1984
14 24 °F September 12, 2014
14 24 °F September 25, 2000
14 24 °F September 27, 1999
14 24 °F September 18, 1971
14 24 °F September 17, 1965
14 24 °F September 27, 1964
14 24 °F September 29, 1959
14 24 °F September 30, 1954