In September, Grand Forks typically sees daytime highs of 20.8°C and overnight lows around 7.0°C. Compared to the annual average high of 10.3°C, September runs +10.5°C.
September in Grand Forks averages a daytime high of 20.8°C and an overnight low of 7.0°C.
September runs +10.5°C compared to Grand Forks's annual average high of 10.3°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 20.8°C and cooler evenings around 7.0°C.