Weather history and climate summary information is available for the following locations:
- Evansville
- Fort Wayne
- Indianapolis
- South Bend
Warmest September Days
The warmest September days in Indiana are:
| Fort Wayne, Indiana | 1953 | 100.4°F |
| Evansville, Indiana | 1990 | 100°F |
| Indianapolis, Indiana | 2011 | 100°F |
| Evansville, Indiana | 2011 | 100°F |
| Evansville, Indiana | 1983 | 98.1°F |
Coldest September Days
The coldest September days in Indiana were:
| Fort Wayne, Indiana | 1995 | 28.9°F |
| Fort Wayne, Indiana | 1951 | 28.9°F |
| Fort Wayne, Indiana | 1942 | 30.4°F |
| Fort Wayne, Indiana | 1993 | 30.9°F |
| Fort Wayne, Indiana | 1974 | 30.9°F |
Wettest September Days
The wettest single days in September occurred:
| South Bend, Indiana | 2008 | 4.6 inches |
| Indianapolis, Indiana | 2003 | 4.6 inches |
| Fort Wayne, Indiana | 1950 | 3.5 inches |
| Evansville, Indiana | 2006 | 3 inches |
| Evansville, Indiana | 2011 | 3 inches |