In September, Grand Island typically sees daytime highs of 25.8°C and overnight lows around 11.3°C. Compared to the annual average high of 17.2°C, September runs +8.6°C.
September in Grand Island averages a daytime high of 25.8°C and an overnight low of 11.3°C.
September runs +8.6°C compared to Grand Island's annual average high of 17.2°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 25.8°C and cooler evenings around 11.3°C.