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Riverton September Weather

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

Typical Riverton September Weather 1991–2020
Average daily high	75.6 °F
Average daily low	42.6 °F
Average monthly precipitation	0.8 inches
Average monthly snow	0.6 inches
Daily chance of precipitation	17.3%
Daily chance of snow	1.1%

Riverton September Weather Records 1907–2024
Highest temperature	98 °F	September 5, 2022
Lowest temperature	9 °F	September 25, 1926
Highest daily low	69 °F	September 19, 1909
Lowest daily high	31 °F	September 18, 1965
Hottest average high temperature	82.1 °F	1948
Coldest average high temperature	62.7 °F	1965
Most daily precipitation	2.1 inches	September 27, 1923
Most monthly precipitation	5.7 inches	1923
Most daily snow	5.7 inches	September 27, 2013
Most monthly snow	5.7 inches	2013

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	82.4	47.8	96	33
September 2	82.0	47.5	95	33
September 3	81.8	47.2	95	30
September 4	81.4	46.9	97	31
September 5	81.0	46.5	98	33
September 6	80.5	46.1	97	29
September 7	79.9	45.7	95	30
September 8	79.3	45.3	98	30
September 9	78.7	44.9	95	24
September 10	78.2	44.5	94	29
September 11	77.6	44.0	90	26
September 12	77.2	43.6	91	28
September 13	76.7	43.2	96	25
September 14	76.2	42.8	91	22
September 15	75.8	42.4	96	27
September 16	75.4	42.2	93	23
September 17	75.1	41.9	93	23
September 18	74.6	41.5	88	10
September 19	74.0	41.1	95	15
September 20	73.4	40.7	91	23
September 21	72.7	40.2	90	19
September 22	72.1	39.8	87	23
September 23	71.5	39.4	87	23
September 24	71.2	39.0	90	19
September 25	70.6	38.6	88	9
September 26	70.0	38.1	88	16
September 27	69.6	37.7	89	19
September 28	69.1	37.3	88	14
September 29	68.7	36.8	88	13
September 30	68.3	36.5	85	17

Weather Station Details

Years	Station	Coordinates
1907–2024	Riverton	location