Weather history and climate summary information is available for the following locations:
- Altus
- Fort Sill
- Oklahoma City
- Tulsa
Warmest September Days
The warmest September days in Oklahoma are:
| Fort Sill, Oklahoma | 1998 | 109.4°F |
| Fort Sill, Oklahoma | 1951 | 108°F |
| Tulsa, Oklahoma | 2000 | 108°F |
| Oklahoma City, Oklahoma | 2000 | 108°F |
| Altus, Oklahoma | 1998 | 107.6°F |
Coldest September Days
The coldest September days in Oklahoma were:
| Tulsa, Oklahoma | 1984 | 35.1°F |
| Oklahoma City, Oklahoma | 1989 | 36°F |
| Altus, Oklahoma | 1984 | 36°F |
| Tulsa, Oklahoma | 1995 | 37°F |
| Oklahoma City, Oklahoma | 1984 | 37°F |
Wettest September Days
The wettest single days in September occurred:
| Tulsa, Oklahoma | 2007 | 6.9 inches |
| Oklahoma City, Oklahoma | 1990 | 5.9 inches |
| Oklahoma City, Oklahoma | 1989 | 5.5 inches |
| Oklahoma City, Oklahoma | 1990 | 5.4 inches |
| Fort Sill, Oklahoma | 2006 | 5.1 inches |