Weather history and climate summary information is available for the following locations:
- Bismarck
- Fargo
Warmest September Days
The warmest September days in North Dakota are:
| Bismarck, North Dakota | 1978 | 104°F |
| Bismarck, North Dakota | 2001 | 102.9°F |
| Bismarck, North Dakota | 1983 | 102.9°F |
| Bismarck, North Dakota | 1976 | 100.9°F |
| Bismarck, North Dakota | 2012 | 100°F |
Coldest September Days
The coldest September days in North Dakota were:
| Bismarck, North Dakota | 1974 | 10.9°F |
| Bismarck, North Dakota | 1992 | 21°F |
| Bismarck, North Dakota | 1995 | 21°F |
| Bismarck, North Dakota | 1936 | 21.4°F |
| Fargo, North Dakota | 2003 | 21.9°F |
Wettest September Days
The wettest single days in September occurred:
| Bismarck, North Dakota | 1994 | 3.7 inches |
| Fargo, North Dakota | 2008 | 2.8 inches |
| Bismarck, North Dakota | 1977 | 2.4 inches |
| Fargo, North Dakota | 1988 | 2.1 inches |
| Fargo, North Dakota | 2010 | 2.1 inches |