|
Typical Great Falls September Weather 1991–2020 |
||
|---|---|---|
| Average daily high | 71.7 °F | |
| Average daily low | 43.2 °F | |
| Average monthly precipitation | 1.3 inches | |
| Average monthly snow | 0.8 inches | |
| Daily chance of precipitation | 23.6% | |
| Daily chance of snow | 0.69% | |
|
Great Falls September Weather Records 1892–2024 |
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|---|---|---|
| Highest temperature | 102 °F | September 3, 2022 |
| Lowest temperature | 10 °F | September 24, 1926 |
| Highest daily low | 68 °F | September 2, 1960 |
| Lowest daily high | 26 °F | September 23, 1934 |
| Hottest average high temperature | 81.0 °F | 1938 |
| Coldest average high temperature | 53.5 °F | 1965 |
| Most daily precipitation | 1.6 inches | September 27, 1982 |
| Most monthly precipitation | 3.6 inches | 1941 |
| Most daily snow | 9.7 inches | September 28, 2019 |
| Most monthly snow | 19.3 inches | 2019 |
| Day | Average (°F) | Record (°F) | ||
|---|---|---|---|---|
| High | Low | High | Low | |
| September 1 | 78.2 | 47.2 | 97 | 34 |
| September 2 | 77.8 | 46.9 | 96 | 33 |
| September 3 | 77.2 | 46.7 | 102 | 34 |
| September 4 | 76.7 | 46.4 | 94 | 33 |
| September 5 | 76.2 | 46.1 | 98 | 31 |
| September 6 | 75.6 | 45.8 | 98 | 27 |
| September 7 | 75.0 | 45.4 | 100 | 27 |
| September 8 | 74.6 | 45.1 | 98 | 28 |
| September 9 | 74.3 | 44.8 | 92 | 31 |
| September 10 | 73.8 | 44.6 | 91 | 29 |
| September 11 | 73.5 | 44.4 | 93 | 29 |
| September 12 | 73.0 | 44.2 | 92 | 29 |
| September 13 | 72.6 | 43.8 | 89 | 27 |
| September 14 | 72.2 | 43.5 | 92 | 27 |
| September 15 | 71.8 | 43.3 | 95 | 29 |
| September 16 | 71.4 | 43.0 | 91 | 27 |
| September 17 | 70.9 | 42.7 | 92 | 26 |
| September 18 | 70.3 | 42.3 | 93 | 23 |
| September 19 | 69.7 | 41.9 | 92 | 26 |
| September 20 | 69.1 | 41.5 | 93 | 24 |
| September 21 | 68.6 | 41.1 | 90 | 20 |
| September 22 | 68.2 | 40.9 | 91 | 24 |
| September 23 | 67.8 | 40.6 | 93 | 16 |
| September 24 | 67.4 | 40.3 | 93 | 10 |
| September 25 | 67.0 | 39.9 | 93 | 17 |
| September 26 | 66.5 | 39.7 | 89 | 20 |
| September 27 | 65.9 | 39.3 | 91 | 23 |
| September 28 | 65.4 | 39.0 | 91 | 25 |
| September 29 | 65.0 | 38.7 | 91 | 21 |
| September 30 | 64.4 | 38.3 | 91 | 12 |