Weather history and climate summary information is available for the following locations:
- Boston
- Chicopee Falls
- Nantucket
Warmest September Days
The warmest September days in Massachusetts are:
| Chicopee Falls, Massachusetts | 1953 | 101.3°F |
| Boston, Massachusetts | 1953 | 99°F |
| Boston, Massachusetts | 1983 | 99°F |
| Chicopee Falls, Massachusetts | 1983 | 97°F |
| Chicopee Falls, Massachusetts | 1973 | 97°F |
Coldest September Days
The coldest September days in Massachusetts were:
| Chicopee Falls, Massachusetts | 1963 | 25.3°F |
| Chicopee Falls, Massachusetts | 1965 | 27.3°F |
| Chicopee Falls, Massachusetts | 1950 | 27.3°F |
| Chicopee Falls, Massachusetts | 1951 | 27.3°F |
| Chicopee Falls, Massachusetts | 1964 | 27.3°F |
Wettest September Days
The wettest single days in September occurred:
| Chicopee Falls, Massachusetts | 1999 | 5.3 inches |
| Chicopee Falls, Massachusetts | 2008 | 5 inches |
| Boston, Massachusetts | 1999 | 4.7 inches |
| Chicopee Falls, Massachusetts | 1998 | 3.2 inches |
| Chicopee Falls, Massachusetts | 1975 | 3.1 inches |