Weather history and climate summary information is available for the following locations:
- Baltimore
- Camp Springs
- Patuxent River
Warmest September Days
The warmest September days in Maryland are:
| Camp Springs, Maryland | 1953 | 100.2°F |
| Baltimore, Maryland | 1962 | 99.3°F |
| Baltimore, Maryland | 1953 | 99.3°F |
| Camp Springs, Maryland | 1954 | 99.3°F |
| Patuxent River, Maryland | 1983 | 99°F |
Coldest September Days
The coldest September days in Maryland were:
| Baltimore, Maryland | 1963 | 35.1°F |
| Baltimore, Maryland | 1962 | 37°F |
| Baltimore, Maryland | 1956 | 37.4°F |
| Baltimore, Maryland | 1951 | 37.9°F |
| Camp Springs, Maryland | 1963 | 38.3°F |
Wettest September Days
The wettest single days in September occurred:
| Patuxent River, Maryland | 1999 | 7.3 inches |
| Camp Springs, Maryland | 1979 | 7.2 inches |
| Baltimore, Maryland | 1985 | 6 inches |
| Camp Springs, Maryland | 2011 | 5.6 inches |
| Patuxent River, Maryland | 2010 | 5.6 inches |