Click on a day for an hourly weather forecast
The temperatures in Alnwick in September are usually low and can range between 10°C and 16°C.
You can expect about 3 to 8 days of rain in Alnwick 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 Alnwick in September 2025.
If you’re planning to visit Alnwick in the near future, we highly recommend that you review the 14 day weather forecast for Alnwick before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 6° / 3° | 7 | 23 | 0 | 23 mm | Bad | Alnwick in January |
| February | 7° / 3° | 6 | 22 | 0 | 20 mm | Ok | Alnwick in February |
| March | 8° / 3° | 5 | 25 | 1 | 22 mm | Ok | Alnwick in March |
| April | 10° / 5° | 4 | 26 | 0 | 18 mm | Ok | Alnwick in April |
| May | 13° / 7° | 6 | 25 | 0 | 19 mm | Ok | Alnwick in May |
| June | 15° / 10° | 6 | 24 | 0 | 23 mm | Good | Alnwick in June |
| July | 17° / 12° | 7 | 24 | 0 | 30 mm | Good | Alnwick in July |
| August | 17° / 12° | 7 | 24 | 0 | 29 mm | Good | Alnwick in August |
| September | 16° / 10° | 6 | 24 | 0 | 21 mm | Good | Alnwick in September |
| October | 13° / 8° | 7 | 24 | 0 | 28 mm | Ok | Alnwick in October |
| November | 9° / 6° | 8 | 21 | 0 | 31 mm | Ok | Alnwick in November |
| December | 7° / 4° | 8 | 23 | 0 | 27 mm | Ok | Alnwick in December |