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Thermopolis September Weather

Averages and records for weather in Thermopolis, Wyoming in the month of September.

Typical Thermopolis September Weather 1991–2020
Average daily high	79.7 °F
Average daily low	45.7 °F
Average monthly precipitation	1.0 inches
Average monthly snow	0.3 inches
Daily chance of precipitation	16.9%
Daily chance of snow	0.33%

Thermopolis September Weather Records 1899–2024
Highest temperature	104 °F	September 7, 2022
Lowest temperature	7 °F	September 25, 1926
Highest daily low	68 °F	September 1, 2012
Lowest daily high	31 °F	September 25, 1934
Hottest average high temperature	85.6 °F	1922
Coldest average high temperature	64.3 °F	1912
Most daily precipitation	4.9 inches	September 30, 1923
Most monthly precipitation	7.1 inches	1923
Most daily snow	4.5 inches	September 22, 2000
Most monthly snow	4.5 inches	2000

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	85.8	51.0	99	29
September 2	85.5	50.7	99	33
September 3	85.3	50.5	99	33
September 4	84.8	50.2	102	33
September 5	84.4	49.8	103	33
September 6	83.9	49.4	102	32
September 7	83.4	49.0	104	33
September 8	82.8	48.6	102	30
September 9	82.3	48.2	98	28
September 10	81.8	47.8	97	30
September 11	81.5	47.4	96	26
September 12	81.0	47.0	96	28
September 13	80.5	46.6	95	28
September 14	80.1	46.2	95	25
September 15	79.8	45.8	94	22
September 16	79.5	45.5	96	23
September 17	79.0	45.2	96	26
September 18	78.6	44.8	93	27
September 19	78.0	44.3	95	29
September 20	77.3	43.9	94	28
September 21	76.7	43.4	95	26
September 22	76.2	43.0	92	27
September 23	75.8	42.6	93	24
September 24	75.4	42.2	91	18
September 25	74.8	41.8	93	7
September 26	74.3	41.4	94	14
September 27	73.9	41.0	93	17
September 28	73.4	40.6	92	21
September 29	72.8	40.2	93	22
September 30	72.3	39.8	91	19

Weather Station Details

Years	Station	Coordinates
1899–2024	Thermopolis	location