|
Typical Casper September Weather 1991–2020 |
||
|---|---|---|
| Average daily high | 75.8 °F | |
| Average daily low | 42.6 °F | |
| Average monthly precipitation | 1.0 inches | |
| Average monthly snow | 1.5 inches | |
|
Casper September Weather Records 1900–2023 |
||
|---|---|---|
| Highest temperature | 103 °F | September 19, 1911 |
| Lowest temperature | 14 °F | September 25, 1926 |
| Highest daily low | 70 °F | September 2, 1925 |
| Lowest daily high | 27 °F | September 24, 1984 |
| Hottest average temperature | 5.6 °F above average |
1998 |
| Coldest average temperature | -11.4 °F below average |
1965 |
| Most daily precipitation | 2.7 inches | September 28, 1923 |
| Most monthly precipitation | 5.1 inches | 1923 |
| Most daily snow | 6.9 inches | September 20, 1995 |
| Most monthly snow | 11.5 inches | 2000 |
| Day | Average (°F) | Record (°F) | ||
|---|---|---|---|---|
| High | Low | High | Low | |
| September 1 | 82.5 | 48.0 | 100 | 32 |
| September 2 | 82.3 | 47.8 | 100 | 32 |
| September 3 | 82.0 | 47.6 | 100 | 31 |
| September 4 | 81.6 | 47.2 | 100 | 34 |
| September 5 | 81.1 | 46.8 | 101 | 34 |
| September 6 | 80.5 | 46.3 | 96 | 31 |
| September 7 | 79.9 | 45.9 | 100 | 28 |
| September 8 | 79.4 | 45.5 | 96 | 29 |
| September 9 | 78.8 | 45.1 | 95 | 24 |
| September 10 | 78.2 | 44.6 | 95 | 27 |
| September 11 | 77.7 | 44.2 | 100 | 26 |
| September 12 | 77.3 | 43.7 | 95 | 25 |
| September 13 | 76.8 | 43.3 | 99 | 23 |
| September 14 | 76.3 | 43.0 | 102 | 25 |
| September 15 | 76.0 | 42.7 | 101 | 25 |
| September 16 | 75.6 | 42.4 | 97 | 19 |
| September 17 | 75.1 | 42.1 | 99 | 19 |
| September 18 | 74.5 | 41.7 | 101 | 19 |
| September 19 | 73.9 | 41.3 | 103 | 23 |
| September 20 | 73.2 | 40.8 | 100 | 16 |
| September 21 | 72.5 | 40.4 | 100 | 21 |
| September 22 | 72.0 | 40.0 | 87 | 25 |
| September 23 | 71.6 | 39.6 | 90 | 24 |
| September 24 | 71.1 | 39.2 | 100 | 18 |
| September 25 | 70.5 | 38.8 | 98 | 14 |
| September 26 | 70.0 | 38.4 | 91 | 15 |
| September 27 | 69.6 | 38.1 | 89 | 21 |
| September 28 | 69.1 | 37.7 | 92 | 18 |
| September 29 | 68.6 | 37.3 | 87 | 18 |
| September 30 | 68.1 | 36.9 | 88 | 17 |