|
Typical Helena September Weather 1991–2020 |
||
|---|---|---|
| Average daily high | 73.4 °F | |
| Average daily low | 44.0 °F | |
| Average monthly precipitation | 1.0 inches | |
| Average monthly snow | 0.2 inches | |
| Daily chance of precipitation | 19.2% | |
| Daily chance of snow | 0.16% | |
|
Helena September Weather Records 1893–2024 |
||
|---|---|---|
| Highest temperature | 102 °F | September 7, 2022 |
| Lowest temperature | 6 °F | September 24, 1926 |
| Highest daily low | 64 °F | September 1, 1991 |
| Lowest daily high | 23 °F | September 23, 1934 |
| Hottest average high temperature | 81.3 °F | 1990 |
| Coldest average high temperature | 56.1 °F | 1965 |
| Most daily precipitation | 1.6 inches | September 30, 1893 |
| Most monthly precipitation | 3.4 inches | 1965 |
| Most daily snow | 13.1 inches | September 18, 1957 |
| Most monthly snow | 14.2 inches | 1925 |
| Day | Average (°F) | Record (°F) | ||
|---|---|---|---|---|
| High | Low | High | Low | |
| September 1 | 80.0 | 48.8 | 96 | 33 |
| September 2 | 79.6 | 48.5 | 97 | 32 |
| September 3 | 79.0 | 48.2 | 99 | 32 |
| September 4 | 78.5 | 47.9 | 96 | 31 |
| September 5 | 78.0 | 47.6 | 99 | 30 |
| September 6 | 77.4 | 47.3 | 94 | 30 |
| September 7 | 76.9 | 46.8 | 102 | 28 |
| September 8 | 76.4 | 46.4 | 93 | 29 |
| September 9 | 76.0 | 46.1 | 93 | 25 |
| September 10 | 75.5 | 45.8 | 91 | 30 |
| September 11 | 75.1 | 45.4 | 92 | 28 |
| September 12 | 74.7 | 45.1 | 91 | 22 |
| September 13 | 74.2 | 44.8 | 92 | 27 |
| September 14 | 73.9 | 44.4 | 94 | 18 |
| September 15 | 73.6 | 44.2 | 94 | 22 |
| September 16 | 73.2 | 43.8 | 92 | 27 |
| September 17 | 72.7 | 43.5 | 90 | 20 |
| September 18 | 72.1 | 43.1 | 91 | 19 |
| September 19 | 71.4 | 42.7 | 94 | 25 |
| September 20 | 70.8 | 42.2 | 90 | 20 |
| September 21 | 70.2 | 41.8 | 90 | 20 |
| September 22 | 69.8 | 41.4 | 89 | 21 |
| September 23 | 69.4 | 41.1 | 90 | 16 |
| September 24 | 68.9 | 40.7 | 88 | 6 |
| September 25 | 68.4 | 40.3 | 95 | 17 |
| September 26 | 67.9 | 39.9 | 88 | 20 |
| September 27 | 67.3 | 39.5 | 88 | 23 |
| September 28 | 66.7 | 39.1 | 88 | 19 |
| September 29 | 66.2 | 38.8 | 84 | 19 |
| September 30 | 65.7 | 38.5 | 89 | 21 |