Average Temperatures for Idaho in September





Average temperatures for September at cities, towns, parks and lakes throughout Idaho are listed below in degrees Fahrenheit and Celsius.

You can jump to a separate table for each region of the state: Eastern, Central, Southwestern and Northern Idaho.

The tables give the normals for maximum and minimum temperatures based on weather data collected from 1981 to 2010 by the US National Climatic Data Center.

Eastern Idaho

Average September temperatures
High °F Low °F Place High °C Low °C
69 37 Driggs 21 3
74 40 Idaho Falls 23 5
71 33 Island Park 22 0
77 41 Malad City 25 5
77 47 Pocatello 25 8
76 42 Preston 24 5
72 37 Saint Anthony 22 3

Central Idaho

Average daily temperatures in September
High °F Low °F Place High °C Low °C
72 42 Craters of the Moon Monument 22 5
71 36 Grouse 22 2
70 35 Ketchum 21 2
77 43 Lake Walcott, Minidoka Dam 25 6
75 37 Middle Fork Lodge 24 3
73 41 Salmon 23 5
69 26 Stanley, Sawtooth Recreation Area 21 -3
75 43 Twin Falls 24 6

Southwestern Idaho

September temperatures: daily averages
High °F Low °F Place High °C Low °C
79 51 Boise 26 11
81 56 Brownlee Reservoir Dam 27 13
83 48 Bruneau 29 9
76 35 Idaho City 25 2
79 49 Lake Lowell, Deer Flat Dam 26 10
70 34 McCall 21 1
81 47 Mountain Home 27 8

Northern Idaho

Average September temperatures
High °F Low °F Place High °C Low °C
73 48 Coeur d’Alene 23 9
73 32 Elk City 23 0
72 42 Kellogg 22 6
78 51 Lewiston 26 11
75 43 Moscow 24 6
72 42 Porthill 22 5
70 36 Powell 21 2
82 49 Riggins 28 9
72 41 Sandpoint 22 5
70 43 Wallace 21 6
Reference

National Climatic Data Center. NOAA's 1981-2010 Climate Normals.

Idaho Temperatures
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