5. Fargo, North Dakota
> Average temperature, September 2021: 64.4°F (6.8°F above average)
> Average September temperature, 1901-2000: 57.6°F
> Hottest September on record: 2015 (65.1°F)
> Coldest September on record: 1965 (48.8°F)
4. Dickinson, North Dakota
> Average temperature, September 2021: 63.6°F (6.9°F above average)
> Average September temperature, 1901-2000: 56.7°F
> Hottest September on record: 1998 (63.9°F)
> Coldest September on record: 1965 (44.6°F)
3. Colorado Springs, Colorado
> Average temperature, September 2021: 68.0°F (7.2°F above average)
> Average September temperature, 1901-2000: 60.8°F
> Hottest September on record: 2019 (68.7°F)
> Coldest September on record: 1961 (54.3°F)
2. Goodland, Kansas
> Average temperature, September 2021: 71.4°F (7.2°F above average)
> Average September temperature, 1901-2000: 64.2°F
> Hottest September on record: 2021 (71.4°F)
> Coldest September on record: 1965 (55.3°F)
1. Grand Forks, North Dakota
> Average temperature, September 2021: 63.0°F (7.8°F above average)
> Average September temperature, 1901-2000: 55.2°F
> Hottest September on record: 2009 (64.1°F)
> Coldest September on record: 1965 (45.8°F)
