Click on a day for an hourly weather forecast
The temperatures in Keswick in September are usually low and can range between 13°C and 18°C.
You can expect about 3 to 8 days of rain in Keswick 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 Keswick in September 2025.
If you’re planning to visit Keswick in the near future, we highly recommend that you review the 14 day weather forecast for Keswick before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 7° / 4° | 8 | 20 | 3 | 63 mm | Awful | Keswick in January |
| February | 7° / 4° | 8 | 16 | 5 | 66 mm | Awful | Keswick in February |
| March | 9° / 5° | 6 | 23 | 2 | 61 mm | Bad | Keswick in March |
| April | 11° / 6° | 4 | 26 | 0 | 41 mm | Ok | Keswick in April |
| May | 14° / 9° | 5 | 26 | 0 | 66 mm | Good | Keswick in May |
| June | 17° / 12° | 6 | 24 | 0 | 91 mm | Good | Keswick in June |
| July | 19° / 14° | 6 | 25 | 0 | 98 mm | Good | Keswick in July |
| August | 20° / 15° | 5 | 26 | 0 | 87 mm | Good | Keswick in August |
| September | 18° / 13° | 4 | 26 | 0 | 64 mm | Good | Keswick in September |
| October | 14° / 11° | 7 | 24 | 0 | 91 mm | Ok | Keswick in October |
| November | 11° / 8° | 6 | 23 | 0 | 76 mm | Ok | Keswick in November |
| December | 8° / 5° | 9 | 20 | 2 | 83 mm | Awful | Keswick in December |