Click on a day for an hourly weather forecast
The temperatures in Penzance in September are comfortable with low of 15°C and and high up to 16°C.
You can expect about 3 to 8 days of rain in Penzance 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 Penzance in September 2025.
If you’re planning to visit Penzance in the near future, we highly recommend that you review the 14 day weather forecast for Penzance before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 10° / 8° | 10 | 21 | 0 | 141 mm | Bad | Penzance in January |
| February | 9° / 7° | 8 | 20 | 1 | 118 mm | Bad | Penzance in February |
| March | 10° / 7° | 7 | 24 | 0 | 96 mm | Bad | Penzance in March |
| April | 11° / 9° | 5 | 25 | 0 | 74 mm | Ok | Penzance in April |
| May | 13° / 10° | 5 | 26 | 0 | 68 mm | Ok | Penzance in May |
| June | 15° / 13° | 5 | 25 | 0 | 73 mm | Good | Penzance in June |
| July | 17° / 15° | 6 | 25 | 0 | 95 mm | Good | Penzance in July |
| August | 17° / 15° | 6 | 25 | 0 | 116 mm | Good | Penzance in August |
| September | 16° / 15° | 5 | 25 | 0 | 74 mm | Good | Penzance in September |
| October | 15° / 13° | 8 | 23 | 0 | 148 mm | Ok | Penzance in October |
| November | 12° / 11° | 9 | 21 | 0 | 174 mm | Bad | Penzance in November |
| December | 11° / 9° | 11 | 20 | 0 | 154 mm | Bad | Penzance in December |