Weather history and climate summary information is available for the following locations:
- Cincinnati
- Cleveland
- Columbus
- Dayton
- Wilmington
- Youngstown
Warmest September Days
The warmest September days in Ohio are:
| Dayton, Ohio | 1954 | 102°F |
| Dayton, Ohio | 1939 | 100.2°F |
| Columbus, Ohio | 1953 | 99.9°F |
| Columbus, Ohio | 1954 | 99.3°F |
| Columbus, Ohio | 1953 | 99°F |
Coldest September Days
The coldest September days in Ohio were:
| Youngstown, Ohio | 1991 | 28.9°F |
| Youngstown, Ohio | 2000 | 30°F |
| Youngstown, Ohio | 1957 | 30°F |
| Columbus, Ohio | 1962 | 30.9°F |
| Dayton, Ohio | 1942 | 31.3°F |
Wettest September Days
The wettest single days in September occurred:
| Cleveland, Ohio | 1973 | 6.1 inches |
| Columbus, Ohio | 1979 | 5 inches |
| Columbus, Ohio | 1979 | 4.8 inches |
| Dayton, Ohio | 2005 | 4.5 inches |
| Dayton, Ohio | 1979 | 4.5 inches |