Idaho September Weather

Idaho weather averages in the month of September from 1991–2020 based on data made available by the NOAA.
Statewide September Averages
High temperature 71.2 °F
Low temperature 41.6 °F
Precipitation 1.1 inches
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Idaho September Temperature by Year
Idaho Cities
September weather averages for various places in Idaho, from 1991–2020.
City Average (°F) Record (°F) Monthly (inches)
High Low High Low Precipitation Snow
Boise 80.0 52.1 102 23 0.4 0.0
Bonners Ferry 73.4 44.1 97 15 1.0 0.0
Burley 76.7 45.0 100 16 0.7 n/a
Coeur d'Alene 73.6 48.2 102 17 0.8 n/a
Emmett 79.7 48.5 103 21 0.4 0.0
Hamer 77.0 38.9 99 8 0.6 0.0
Idaho Falls 75.1 40.5 97 18 0.9 n/a
Jerome 79.8 46.7 102 21 0.4 n/a
Kellogg 72.9 43.0 102 11 1.4 0.0
Ketchum 70.0 35.6 93 11 0.7 0.0
Lewiston 79.1 52.0 108 28 0.6 0.0
McCall 72.2 35.8 95 9 1.1 0.0
Moscow 76.3 42.5 100 20 1.0 0.0
Pierce 72.5 36.3 103 10 1.4 0.0
Pocatello 77.2 42.2 100 19 0.9 0.0
Preston 77.1 42.9 95 13 1.4 0.0
Rexburg 73.9 41.3 94 14 1.0 n/a
Salmon 74.8 41.0 98 20 0.7 0.2
Sandpoint 72.7 42.1 96 16 1.4 0.0
St. Maries 73.5 43.8 104 18 1.1 0.0
Twin Falls 77.1 47.5 101 14 0.5 n/a