< Previous Month Next Month >

Hamilton September Weather

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

Typical Hamilton September Weather 1991–2020
Average daily high	73.7 °F
Average daily low	41.3 °F
Average monthly precipitation	0.8 inches
Daily chance of precipitation	20.9%

Hamilton September Weather Records 1895–2024
Highest temperature	98 °F	September 2, 1998
Lowest temperature	10 °F	September 7, 1895
Highest daily low	79 °F	September 16, 1899
Lowest daily high	35 °F	September 30, 2019
Hottest average high temperature	83.4 °F	1924
Coldest average high temperature	58.9 °F	1965
Most daily precipitation	1.7 inches	September 6, 1911
Most monthly precipitation	3.4 inches	1910

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	79.3	45.1	98	28
September 2	79.0	44.9	98	29
September 3	78.5	44.6	94	28
September 4	77.9	44.4	94	24
September 5	77.5	44.1	95	19
September 6	77.0	43.8	94	17
September 7	76.6	43.5	98	10
September 8	76.2	43.1	94	21
September 9	75.9	43.0	92	28
September 10	75.5	42.7	95	28
September 11	75.1	42.5	95	27
September 12	74.9	42.2	92	20
September 13	74.5	42.0	93	20
September 14	74.1	41.7	90	19
September 15	73.8	41.4	92	22
September 16	73.6	41.1	87	21
September 17	73.2	40.9	92	19
September 18	72.8	40.6	90	24
September 19	72.3	40.3	90	27
September 20	71.7	39.9	87	19
September 21	71.2	39.5	94	16
September 22	70.7	39.2	89	16
September 23	70.4	38.9	87	17
September 24	70.0	38.7	91	18
September 25	69.7	38.4	94	25
September 26	69.1	38.0	90	21
September 27	68.6	37.7	90	25
September 28	67.9	37.4	87	25
September 29	67.4	37.1	89	21
September 30	66.9	36.8	86	18

Weather Station Details

Years	Station	Coordinates
1895–2024	Hamilton	location