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West Yellowstone September Weather

Averages and records for weather in West Yellowstone, Montana in the month of September.

Typical West Yellowstone September Weather 1991–2020
Average daily high	67.9 °F
Average daily low	31.5 °F
Average monthly precipitation	1.3 inches
Daily chance of precipitation	17.2%

West Yellowstone September Weather Records 1924–2024
Highest temperature	91 °F	September 3, 2022
Lowest temperature	-9 °F	September 24, 1926
Highest daily low	53 °F	September 7, 1991
Lowest daily high	30 °F	September 16, 1965
Hottest average high temperature	76.0 °F	1938
Coldest average high temperature	54.3 °F	1965
Most daily precipitation	1.4 inches	September 30, 1983
Most monthly precipitation	4.0 inches	1961

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	73.5	34.7	89	18
September 2	73.2	34.5	90	20
September 3	72.7	34.4	91	20
September 4	72.3	34.1	91	14
September 5	71.8	33.9	89	23
September 6	71.3	33.6	89	19
September 7	70.9	33.3	90	9
September 8	70.5	33.1	85	8
September 9	70.1	32.8	86	13
September 10	69.7	32.6	83	20
September 11	69.3	32.4	84	15
September 12	68.9	32.1	85	13
September 13	68.5	31.9	84	16
September 14	68.2	31.6	86	16
September 15	68.0	31.5	84	12
September 16	67.7	31.3	82	10
September 17	67.2	31.1	84	14
September 18	66.6	30.9	84	11
September 19	66.0	30.6	85	11
September 20	65.4	30.4	83	-3
September 21	64.9	30.1	82	14
September 22	64.4	29.9	84	14
September 23	63.9	29.6	84	12
September 24	63.5	29.3	83	-9
September 25	63.0	29.1	81	-5
September 26	62.5	28.8	81	8
September 27	62.0	28.5	80	10
September 28	61.4	28.3	81	8
September 29	60.9	28.1	80	3
September 30	60.4	27.9	79	4

Weather Station Details

Years	Station	Coordinates
1997–2024	West Yellowstone	location
1924–1996	West Yellowstone	location