Average Temperatures for Idaho in May

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

The tables give the normals for maximum and minimum monthly temperatures based on weather data collected from 1981 to 2010.

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

Eastern Idaho

Average May temperatures
High °F Low °F Place High °C Low °C
61 34 Driggs 16   1
67 39 Idaho Falls 19   4
61 33 Island Park 16   0
69 39 Malad City 20   4
68 42 Pocatello 20   5
68 39 Preston 20   4
65 36 Saint Anthony 18   2

Central Idaho

Average daily temperatures in May
High °F Low °F Place High °C Low °C
64 38 Craters of the Moon Monument 18   3
62 34 Grouse 17   1
62 34 Ketchum 17   1
70 40 Lake Walcott, Minidoka Dam 21   4
67 36 Middle Fork Lodge 19   2
67 40 Salmon 20   4
60 27 Stanley, Sawtooth Recreation Area 16  -3
68 41 Twin Falls 20   5

Southwestern Idaho

May temperatures: daily averages
High °F Low °F Place High °C Low °C
72 47 Boise 22   8
74 50 Brownlee Reservoir Dam 23 10
77 47 Bruneau 25   8
67 35 Idaho City 19   2
73 47 Lake Lowell, Deer Flat Dam 23   8
61 34 McCall 16   1
73 44 Mountain Home 23   7

Northern Idaho

Average May temperatures
High °F Low °F Place High °C Low °C
65 44 Coeur d’Alene 18   6
63 33 Elk City 17   0
67 41 Kellogg 19   5
71 47 Lewiston 22   8
67 41 Moscow 19   5
68 42 Porthill 20   6
63 35 Powell 17   1
74 45 Riggins 23   7
66 41 Sandpoint 19   5
64 41 Wallace 18   5
Reference

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

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