The temperatures in Sisteron in September are comfortable with low of 12°C and and high up to 25°C.
You can expect about 3 to 8 days of rain in Sisteron 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 Sisteron in September 2026.
If you’re planning to visit Sisteron in the near future, we highly recommend that you review the 14 day weather forecast for Sisteron before you arrive.
Temperatures
25° / 12°
Rainy Days
3
Snowy Days
0
Dry Days
27
Rainfall
49
mm
Sun Hours
11.5
Hrs
