Click on a day for an hourly weather forecast
The temperatures in Oregon in September are comfortable with low of 11°C and and high up to 23°C.
You can expect about 3 to 8 days of rain in Oregon 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 Oregon in September 2025.
If you’re planning to visit Oregon in the near future, we highly recommend that you review the 14 day weather forecast for Oregon before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 8° / 2° | 13 | 16 | 2 | 263 mm | Awful | Oregon in January |
| February | 8° / 2° | 11 | 13 | 4 | 201 mm | Awful | Oregon in February |
| March | 11° / 3° | 13 | 16 | 2 | 217 mm | Awful | Oregon in March |
| April | 14° / 4° | 9 | 20 | 1 | 154 mm | Ok | Oregon in April |
| May | 19° / 6° | 6 | 25 | 0 | 98 mm | Good | Oregon in May |
| June | 22° / 9° | 4 | 26 | 0 | 84 mm | Good | Oregon in June |
| July | 27° / 11° | 1 | 30 | 0 | 14 mm | Perfect | Oregon in July |
| August | 27° / 12° | 1 | 30 | 0 | 20 mm | Perfect | Oregon in August |
| September | 23° / 11° | 4 | 26 | 0 | 95 mm | Perfect | Oregon in September |
| October | 16° / 8° | 9 | 22 | 0 | 201 mm | Ok | Oregon in October |
| November | 10° / 4° | 13 | 17 | 1 | 222 mm | Bad | Oregon in November |
| December | 7° / 1° | 12 | 17 | 2 | 261 mm | Awful | Oregon in December |