The temperatures in Terni in September are comfortable with low of 12°C and and high up to 27°C.
You can expect about 3 to 8 days of rain in Terni 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 Terni in September 2026.
If you’re planning to visit Terni in the near future, we highly recommend that you review the 14 day weather forecast for Terni before you arrive.
Temperatures
27° / 12°
Rainy Days
4
Snowy Days
0
Dry Days
26
Rainfall
68
mm
Sun Hours
11.7
Hrs
