August in Grand Island averages a daily high of 29.9°C with nights around 17.3°C. Expect roughly 8.5 wet days totalling 77.6mm. Generally workable, with some weather to plan around.
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 August data.