Weather history and climate summary information is available for the following locations:
Warmest September Days
The warmest September days in Arizona are:
| Mesa, Arizona | 1950 | 113.4°F |
| Phoenix, Arizona | 1945 | 112.3°F |
| Phoenix, Arizona | 1982 | 111.9°F |
| Phoenix, Arizona | 1990 | 111.9°F |
| Phoenix, Arizona | 1983 | 111.9°F |
Coldest September Days
The coldest September days in Arizona were:
| Winslow, Arizona | 1978 | 30.9°F |
| Winslow, Arizona | 1973 | 33.8°F |
| Winslow, Arizona | 1974 | 34°F |
| Winslow, Arizona | 2004 | 35.6°F |
| Winslow, Arizona | 2000 | 36°F |
Wettest September Days
The wettest single days in September occurred:
| Tucson, Arizona | 2010 | 4.2 inches |
| Tucson, Arizona | 2011 | 2.8 inches |
| Phoenix, Arizona | 1983 | 2.8 inches |
| Mesa, Arizona | 1983 | 2.6 inches |
| Tucson, Arizona | 1978 | 2.5 inches |