Weather history and climate summary information is available for the following locations:
- Alexandria
- Lafayette
- Lake Charles
- Monroe
- New Orleans
- Shreveport
Warmest September Days
The warmest September days in Louisiana are:
| Shreveport, Louisiana | 2000 | 109°F |
| Alexandria, Louisiana | 2000 | 108°F |
| Monroe, Louisiana | 2000 | 107.1°F |
| Shreveport, Louisiana | 2011 | 107.1°F |
| Lake Charles, Louisiana | 2000 | 105.1°F |
Coldest September Days
The coldest September days in Louisiana were:
| Shreveport, Louisiana | 1967 | 38.3°F |
| Monroe, Louisiana | 1983 | 41°F |
| Alexandria, Louisiana | 1999 | 41°F |
| Shreveport, Louisiana | 1983 | 41°F |
| Monroe, Louisiana | 1975 | 42.1°F |
Wettest September Days
The wettest single days in September occurred:
| Lake Charles, Louisiana | 1979 | 11.1 inches |
| Lake Charles, Louisiana | 1978 | 10 inches |
| New Orleans, Louisiana | 2002 | 9.3 inches |
| Lake Charles, Louisiana | 1973 | 6.9 inches |
| Monroe, Louisiana | 2008 | 5.9 inches |