Click on a day for an hourly weather forecast
The temperatures in Astoria in September are usually low and can range between 12°C and 19°C.
You can expect about 3 to 8 days of rain in Astoria 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 Astoria in September 2025.
If you’re planning to visit Astoria in the near future, we highly recommend that you review the 14 day weather forecast for Astoria before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 8° / 4° | 14 | 17 | 0 | 235 mm | Bad | Astoria in January |
| February | 8° / 3° | 12 | 15 | 1 | 162 mm | Bad | Astoria in February |
| March | 9° / 4° | 14 | 17 | 0 | 189 mm | Bad | Astoria in March |
| April | 11° / 5° | 10 | 20 | 0 | 153 mm | Bad | Astoria in April |
| May | 14° / 8° | 7 | 24 | 0 | 81 mm | Ok | Astoria in May |
| June | 17° / 10° | 4 | 26 | 0 | 45 mm | Good | Astoria in June |
| July | 19° / 12° | 1 | 30 | 0 | 13 mm | Good | Astoria in July |
| August | 20° / 12° | 2 | 29 | 0 | 18 mm | Good | Astoria in August |
| September | 19° / 12° | 6 | 24 | 0 | 69 mm | Good | Astoria in September |
| October | 15° / 9° | 10 | 21 | 0 | 176 mm | Ok | Astoria in October |
| November | 10° / 6° | 14 | 16 | 0 | 255 mm | Bad | Astoria in November |
| December | 7° / 3° | 14 | 17 | 0 | 239 mm | Bad | Astoria in December |