Click on a day for an hourly weather forecast
The temperatures in Helston in September are quite cold with temperatures between 9°C and 20°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Helston 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 Helston in September 2025.
If you’re planning to visit Helston in the near future, we highly recommend that you review the 14 day weather forecast for Helston before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -11° / -19° | 2 | 11 | 18 | 23 mm | Awful | Helston in January |
| February | -11° / -19° | 2 | 11 | 15 | 20 mm | Awful | Helston in February |
| March | -2° / -9° | 5 | 11 | 16 | 36 mm | Awful | Helston in March |
| April | 7° / -1° | 4 | 17 | 9 | 53 mm | Bad | Helston in April |
| May | 16° / 7° | 6 | 24 | 1 | 102 mm | Good | Helston in May |
| June | 22° / 12° | 7 | 23 | 0 | 145 mm | Ok | Helston in June |
| July | 26° / 14° | 5 | 26 | 0 | 81 mm | Perfect | Helston in July |
| August | 26° / 13° | 5 | 26 | 0 | 78 mm | Perfect | Helston in August |
| September | 20° / 9° | 4 | 26 | 0 | 74 mm | Good | Helston in September |
| October | 10° / 3° | 5 | 21 | 5 | 64 mm | Bad | Helston in October |
| November | 0° / -6° | 3 | 14 | 13 | 35 mm | Awful | Helston in November |
| December | -9° / -15° | 2 | 12 | 17 | 30 mm | Awful | Helston in December |