September in Grand Island averages a daily high of 26.5°C with nights around 12.1°C. Expect roughly 6.6 wet days totalling 50.8mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Grand Island is September–October.
Based on GRAND ISLAND CENTRAL NE REGIONAL AIRPORT, NE US (4.7km), 1995–2024. 30 years of September data.