Click on a day for an hourly weather forecast
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.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 8° / 0° | 5 | 24 | 2 | 69 mm | Bad | Sisteron in January |
| February | 10° / 1° | 5 | 21 | 2 | 59 mm | Bad | Sisteron in February |
| March | 14° / 3° | 4 | 26 | 1 | 61 mm | Good | Sisteron in March |
| April | 18° / 6° | 5 | 26 | 0 | 79 mm | Good | Sisteron in April |
| May | 22° / 9° | 5 | 26 | 0 | 75 mm | Good | Sisteron in May |
| June | 27° / 13° | 4 | 26 | 0 | 48 mm | Perfect | Sisteron in June |
| July | 30° / 15° | 3 | 28 | 0 | 38 mm | Good | Sisteron in July |
| August | 30° / 15° | 3 | 28 | 0 | 47 mm | Good | Sisteron in August |
| September | 25° / 12° | 3 | 27 | 0 | 49 mm | Perfect | Sisteron in September |
| October | 19° / 8° | 4 | 27 | 0 | 99 mm | Good | Sisteron in October |
| November | 13° / 4° | 6 | 24 | 0 | 144 mm | Ok | Sisteron in November |
| December | 9° / 2° | 5 | 25 | 1 | 68 mm | Ok | Sisteron in December |