Click on a day for an hourly weather forecast
The temperatures in Falmouth in September are usually low and can range between 14°C and 17°C.
You can expect about 3 to 8 days of rain in Falmouth 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 Falmouth in September 2025.
If you’re planning to visit Falmouth in the near future, we highly recommend that you review the 14 day weather forecast for Falmouth before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 9° / 7° | 8 | 22 | 1 | 91 mm | Bad | Falmouth in January |
| February | 9° / 7° | 7 | 20 | 1 | 78 mm | Bad | Falmouth in February |
| March | 10° / 7° | 6 | 25 | 0 | 62 mm | Ok | Falmouth in March |
| April | 11° / 8° | 4 | 26 | 0 | 51 mm | Ok | Falmouth in April |
| May | 13° / 10° | 3 | 28 | 0 | 52 mm | Ok | Falmouth in May |
| June | 16° / 13° | 5 | 25 | 0 | 63 mm | Good | Falmouth in June |
| July | 18° / 15° | 5 | 27 | 0 | 62 mm | Good | Falmouth in July |
| August | 18° / 16° | 5 | 26 | 0 | 84 mm | Good | Falmouth in August |
| September | 17° / 14° | 3 | 27 | 0 | 50 mm | Good | Falmouth in September |
| October | 15° / 13° | 6 | 25 | 0 | 99 mm | Good | Falmouth in October |
| November | 12° / 10° | 8 | 22 | 0 | 115 mm | Bad | Falmouth in November |
| December | 11° / 9° | 8 | 23 | 1 | 94 mm | Bad | Falmouth in December |