Grand Island Weather in September

What's the weather like in Grand Island (Nebraska) in September 2025?

The climate in Grand Island during September can be summarized as mild and reasonably dry.

September is in the fall / autumn in Grand Island and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a comfortable 25°C (76°F), whilst at night 11°C (52°F) is normal.

Grand Island weather averages (imperial / metric)
Daytime temperature 24.6°C 76.2°F
Nightly temperature 10.9°C 51.5°F
Average temperature 17.7°C 63.9°F
Daily sunshine 9.5 hrs
Avg rainfall 70 mm 2.8 ins
Rainy days 8 days
Sea temperature 18.8°C 65.8°F
Humidity 67%
Windspeed 18.4kph 11 mph

On average September is the 5th wettest month of the year in Grand Island with around 70mm 2.8 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 8 days, although this may vary considerably.

On the flip side this corresponds to an average of 9.5 hours of sunshine per day.

September temperatures in Grand Island

Grand Island average temperature in September

September rainfall

Grand Island average rain in September

September hourly sunshine

Grand Island average rain in September

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Grand Island in September 2025.

Other monthly averages

Best places to visit in September

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Grand Island weather stats

Grand Island weather statistics
Hottest month: July 31°C 87.8°F
Driest month: January 12mm 0.5ins
Sunniest month: July 12.5hrs
Coldest month: January 0.3°C 32.5°F
Wettest month: May 103mm 4.1ins
Map showing location of Grand Island (40.92501, -98.34201) Grand Island map pin © Google

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