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compiled a ranking of the coldest Septembers in Idaho since 1895 using data from the . Rankings are based on the lowest average temperature in each month. For each of the coldest months listed below, we've included the average state temperature, state-wide highs and lows for the month, and the total precipitation.

#10. September 1941
- Average temperature: 50.1°F
- Monthly high temperature: 61.8°F
- Monthly low temperature: 38.5°F
- Total precipitation: 1.57"

#8. September 1971 (tie)
- Average temperature: 50°F
- Monthly high temperature: 64°F
- Monthly low temperature: 36°F
- Total precipitation: 1.38"

#8. September 1961 (tie)
- Average temperature: 50°F
- Monthly high temperature: 62.2°F
- Monthly low temperature: 37.9°F
- Total precipitation: 2.17"

#6. September 1986 (tie)
- Average temperature: 49.9°F
- Monthly high temperature: 60.6°F
- Monthly low temperature: 39.1°F
- Total precipitation: 2.76"

#6. September 1970 (tie)
- Average temperature: 49.9°F
- Monthly high temperature: 63.5°F
- Monthly low temperature: 36.3°F
- Total precipitation: 2.01"

#5. September 1921
- Average temperature: 49.6°F
- Monthly high temperature: 63.4°F
- Monthly low temperature: 35.9°F
- Total precipitation: 1.02"

#3. September 1985 (tie)
- Average temperature: 49.2°F
- Monthly high temperature: 60.7°F
- Monthly low temperature: 37.7°F
- Total precipitation: 3.24"

#3. September 1926 (tie)
- Average temperature: 49.2°F
- Monthly high temperature: 63.6°F
- Monthly low temperature: 34.7°F
- Total precipitation: 1.14"

#1. September 1965 (tie)
- Average temperature: 48.6°F
- Monthly high temperature: 61°F
- Monthly low temperature: 36.2°F
- Total precipitation: 1.25"

#1. September 1912 (tie)
- Average temperature: 48.6°F
- Monthly high temperature: 62°F
- Monthly low temperature: 35.3°F
- Total precipitation: 1.11"