Click on a day for an hourly weather forecast
The temperatures in Grand Island in September are comfortable with low of 14°C and and high up to 26°C.
You can expect about 3 to 8 days of rain in Grand Island during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Grand Island in September 2025.
If you’re planning to visit Grand Island in the near future, we highly recommend that you review the 14 day weather forecast for Grand Island before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 2° / -7° | 4 | 25 | 2 | 20 mm | Awful | Grand Island in January |
| February | 3° / -7° | 4 | 22 | 2 | 19 mm | Awful | Grand Island in February |
| March | 11° / 0° | 4 | 25 | 2 | 52 mm | Bad | Grand Island in March |
| April | 16° / 5° | 6 | 23 | 1 | 86 mm | Good | Grand Island in April |
| May | 22° / 11° | 8 | 23 | 0 | 158 mm | Ok | Grand Island in May |
| June | 28° / 17° | 7 | 23 | 0 | 140 mm | Good | Grand Island in June |
| July | 31° / 19° | 6 | 25 | 0 | 77 mm | Good | Grand Island in July |
| August | 30° / 18° | 6 | 25 | 0 | 90 mm | Good | Grand Island in August |
| September | 26° / 14° | 5 | 25 | 0 | 66 mm | Perfect | Grand Island in September |
| October | 18° / 7° | 5 | 25 | 1 | 66 mm | Good | Grand Island in October |
| November | 11° / 1° | 3 | 26 | 1 | 25 mm | Ok | Grand Island in November |
| December | 3° / -5° | 4 | 24 | 2 | 36 mm | Awful | Grand Island in December |