|
Typical Iowa City September Weather 1991–2020 |
||
|---|---|---|
| Average daily high | 77.1 °F | |
| Average daily low | 54.3 °F | |
| Average monthly precipitation | 3.3 inches | |
| Daily chance of precipitation | 31.9% | |
|
Iowa City September Weather Records 1893–2024 |
||
|---|---|---|
| Highest temperature | 101 °F | September 9, 2013 |
| Lowest temperature | 20 °F | September 30, 1899 |
| Highest daily low | 76 °F | September 2, 2011 |
| Lowest daily high | 41 °F | September 25, 1942 |
| Hottest average high temperature | 85.7 °F | 1897 |
| Coldest average high temperature | 69.8 °F | 1918 |
| Most daily precipitation | 4.8 inches | September 26, 1930 |
| Most monthly precipitation | 10.6 inches | 1970 |
| Day | Average (°F) | Record (°F) | ||
|---|---|---|---|---|
| High | Low | High | Low | |
| September 1 | 81.6 | 60.0 | 99 | 40 |
| September 2 | 81.4 | 59.7 | 100 | 39 |
| September 3 | 81.2 | 59.4 | 98 | 42 |
| September 4 | 81.1 | 59.1 | 99 | 42 |
| September 5 | 80.8 | 58.9 | 101 | 40 |
| September 6 | 80.6 | 58.5 | 100 | 38 |
| September 7 | 80.2 | 58.2 | 101 | 40 |
| September 8 | 79.9 | 57.7 | 99 | 40 |
| September 9 | 79.5 | 57.3 | 101 | 39 |
| September 10 | 79.1 | 56.8 | 99 | 36 |
| September 11 | 78.7 | 56.4 | 97 | 33 |
| September 12 | 78.4 | 55.9 | 96 | 33 |
| September 13 | 78.0 | 55.4 | 100 | 33 |
| September 14 | 77.6 | 55.0 | 96 | 32 |
| September 15 | 77.3 | 54.5 | 97 | 35 |
| September 16 | 77.0 | 54.0 | 95 | 35 |
| September 17 | 76.6 | 53.6 | 97 | 37 |
| September 18 | 76.2 | 53.3 | 93 | 28 |
| September 19 | 75.9 | 52.9 | 96 | 33 |
| September 20 | 75.4 | 52.5 | 97 | 31 |
| September 21 | 75.0 | 52.1 | 92 | 31 |
| September 22 | 74.5 | 51.6 | 94 | 31 |
| September 23 | 74.2 | 51.2 | 95 | 32 |
| September 24 | 74.0 | 50.8 | 93 | 30 |
| September 25 | 73.7 | 50.4 | 93 | 29 |
| September 26 | 73.3 | 50.0 | 90 | 28 |
| September 27 | 72.9 | 49.5 | 89 | 30 |
| September 28 | 72.5 | 49.1 | 96 | 24 |
| September 29 | 72.0 | 48.7 | 95 | 29 |
| September 30 | 71.6 | 48.3 | 93 | 20 |