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The temperatures in Grants Pass in September are quite cold with temperatures between 6°C and 28°C, warm clothes are a must.
The wather in Grants Pass in September can vary between cold and nice weather days. Expect a few rainy days but usually not more than 3.
Our weather forecast can give you a great sense of what weather to expect in Grants Pass in September 2025.
If you’re planning to visit Grants Pass in the near future, we highly recommend that you review the 14 day weather forecast for Grants Pass before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 10° / 0° | 9 | 20 | 2 | 209 mm | Awful | Grants Pass in January |
| February | 11° / -1° | 10 | 15 | 3 | 179 mm | Awful | Grants Pass in February |
| March | 13° / 0° | 11 | 17 | 3 | 190 mm | Awful | Grants Pass in March |
| April | 16° / 1° | 7 | 22 | 1 | 104 mm | Ok | Grants Pass in April |
| May | 20° / 3° | 4 | 27 | 0 | 77 mm | Good | Grants Pass in May |
| June | 25° / 6° | 3 | 27 | 0 | 44 mm | Perfect | Grants Pass in June |
| July | 31° / 8° | 0 | 31 | 0 | 8 mm | Good | Grants Pass in July |
| August | 31° / 8° | 1 | 30 | 0 | 14 mm | Good | Grants Pass in August |
| September | 28° / 6° | 2 | 28 | 0 | 33 mm | Perfect | Grants Pass in September |
| October | 21° / 4° | 4 | 27 | 0 | 84 mm | Good | Grants Pass in October |
| November | 13° / 1° | 7 | 22 | 1 | 142 mm | Bad | Grants Pass in November |
| December | 9° / -1° | 10 | 19 | 2 | 203 mm | Awful | Grants Pass in December |