Idaho September Weather

Idaho weather averages and all-time records in the month of September from 1991–2020 based on data made available by the NOAA.

State:

Month:

Statewide September Averages
High temperature	71.2 °F
Low temperature	41.6 °F
Precipitation	1.1 inches

Idaho Cities

September weather averages for various places in Idaho, from 1991–2020.

City	Average (°F)		Record (°F)		Monthly (inches)
City	High	Low	High	Low	Precipitation	Snow
Boise	80.0	52.1	105	22	0.4	0.0
Bonners Ferry	73.4	44.1	97	15	1.0	0.0
Burley	76.7	45.0	101	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	100	18	0.9	n/a
Jerome	79.8	46.7	102	21	0.4	n/a
Kellogg	72.9	43.0	104	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	1.3	0.0
Pocatello	77.2	42.2	102	19	0.9	0.0
Preston	77.1	42.9	98	13	1.4	0.0
Rexburg	73.9	41.3	96	14	1.0	n/a
Salmon	74.8	41.0	98	20	0.7	0.2
Sandpoint	72.7	42.1	96	16	1.3	0.0
St. Maries	73.5	43.8	104	18	1.1	0.0
Twin Falls	77.1	47.5	102	14	0.5	n/a