The temperatures in Formia in September are comfortable with low of 19°C and and high up to 25°C.
You can expect about 3 to 8 days of rain in Formia 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 Formia in September 2025.
If you’re planning to visit Formia in the near future, we highly recommend that you review the 14 day weather forecast for Formia before you arrive.
Temperatures
25° / 19°
Rainy Days
5
Snowy Days
0
Dry Days
25
Rainfall
107
mm
Sun Hours
9.7
Hrs