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Idaho Falls September Weather

Averages and records for weather in Idaho Falls, Idaho in the month of September.

Typical Idaho Falls September Weather 1991–2020
Average daily high	75.1 °F
Average daily low	40.5 °F
Average monthly precipitation	0.9 inches
Daily chance of precipitation	17.1%

Idaho Falls September Weather Records 1948–2023
Highest temperature	100 °F	September 3, 2022
Lowest temperature	18 °F	September 24, 2000
Highest daily low	62 °F	September 10, 2017
Lowest daily high	38 °F	September 17, 1965
Hottest average temperature	6.7 °F above average	1990
Coldest average temperature	-7.7 °F below average	1965
Most daily precipitation	1.0 inches	September 21, 2006
Most monthly precipitation	2.9 inches	2017

Note: Daily averages are a moving average which includes 14 days before and after

Day	Average (°F)		Record (°F)
Day	High	Low	High	Low
September 1	80.6	44.1	96	32
September 2	80.3	43.9	96	33
September 3	79.9	43.8	100	30
September 4	79.4	43.5	97	31
September 5	79.0	43.2	97	33
September 6	78.5	43.0	99	31
September 7	78.1	42.7	99	30
September 8	77.7	42.4	92	29
September 9	77.2	42.1	95	26
September 10	76.9	41.9	95	29
September 11	76.5	41.6	93	32
September 12	76.1	41.4	91	24
September 13	75.7	41.1	91	29
September 14	75.4	40.8	94	28
September 15	75.2	40.5	91	26
September 16	74.9	40.3	89	29
September 17	74.5	40.1	90	24
September 18	74.0	39.9	90	21
September 19	73.5	39.7	90	22
September 20	72.9	39.4	86	18
September 21	72.4	39.1	86	22
September 22	71.8	38.7	87	25
September 23	71.4	38.4	88	23
September 24	70.9	38.1	88	18
September 25	70.5	37.8	89	21
September 26	69.9	37.5	87	26
September 27	69.4	37.1	86	24
September 28	68.8	36.8	87	18
September 29	68.3	36.5	89	18
September 30	67.8	36.3	90	18

Weather Station Details

Years	Station	Coordinates
1948–2023	Idaho Falls Fanning Field	location