Click on a day for an hourly weather forecast
The temperatures in Keswick in September are comfortable with low of 11°C and and high up to 21°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 | -5° / -10° | 5 | 5 | 20 | 84 mm | Awful | Keswick in January |
| February | -4° / -10° | 4 | 6 | 19 | 76 mm | Awful | Keswick in February |
| March | 3° / -4° | 7 | 11 | 13 | 84 mm | Awful | Keswick in March |
| April | 9° / 1° | 9 | 15 | 7 | 128 mm | Awful | Keswick in April |
| May | 18° / 7° | 8 | 22 | 1 | 129 mm | Ok | Keswick in May |
| June | 22° / 12° | 8 | 22 | 0 | 145 mm | Ok | Keswick in June |
| July | 25° / 15° | 9 | 22 | 0 | 170 mm | Good | Keswick in July |
| August | 25° / 15° | 8 | 23 | 0 | 148 mm | Good | Keswick in August |
| September | 21° / 11° | 6 | 24 | 0 | 99 mm | Good | Keswick in September |
| October | 13° / 6° | 8 | 21 | 1 | 125 mm | Bad | Keswick in October |
| November | 6° / 0° | 7 | 14 | 10 | 75 mm | Awful | Keswick in November |
| December | 0° / -5° | 6 | 8 | 17 | 73 mm | Awful | Keswick in December |