The month of September was considerably warmer than the 1981-2020 average. In Fargo, the average daily high was 76.6 degrees and the average daily low was 52.1 degrees, for an average daily mean temperature of 60.4 degrees, which is 4.1 degrees warmer than average and the sixth warmest on record to 1881. In Grand Forks, the average daily high was 75.8 degrees and the average daily low was 52 degrees for an average daily mean temperature of 63.9 degrees, which is 5.7 degrees warmer than the three-decade average and the second warmest on record to 1894.
The hottest temperature in Fargo was 90 degrees on Sept. 27. The hottest in Grand Forks was 91 degrees that same day. The coolest Fargo temperature was 41 degrees Sept. 27. The coolest in Grand Forks was 41 degrees on the 28th. Fargo received 2.98 inches of rain, which is 0.3 inches more than average. Grand Forks received 1.28 inches, which is 0.77 inches less than average.