The temperatures in Falmouth during September are extremely high, between 27°C and hot as 30°C, drinking water regularly is advisable.
You can expect rain for roughly half of the month of September in Falmouth. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
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.
Temperatures
30° / 27°
Rainy Days
10
Snowy Days
0
Dry Days
20
Rainfall
158
mm
Sun Hours
11.5
Hrs
