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The weather in Sondrio in September is very cold with temperatures between 4°C and 12°C, warm clothes are a must.
You can expect rain for roughly half of the month of September in Sondrio. 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.
You can expect a few days of snow in Sondrio during September. It’s important to get out your snow boots and warm mittens to stay warm while you explore Sondrio.
Our weather forecast can give you a great sense of what weather to expect in Sondrio in September 2026.
If you’re planning to visit Sondrio in the near future, we highly recommend that you review the 14 day weather forecast for Sondrio before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -3° / -11° | 6 | 9 | 17 | 82 mm | Awful | Sondrio in January |
| February | -2° / -10° | 5 | 7 | 18 | 102 mm | Awful | Sondrio in February |
| March | 1° / -8° | 6 | 5 | 21 | 108 mm | Awful | Sondrio in March |
| April | 4° / -3° | 9 | 4 | 19 | 182 mm | Awful | Sondrio in April |
| May | 9° / 1° | 19 | 3 | 13 | 231 mm | Awful | Sondrio in May |
| June | 14° / 5° | 20 | 9 | 2 | 269 mm | Bad | Sondrio in June |
| July | 17° / 7° | 20 | 10 | 1 | 284 mm | Ok | Sondrio in July |
| August | 16° / 7° | 19 | 12 | 0 | 298 mm | Ok | Sondrio in August |
| September | 12° / 4° | 13 | 14 | 3 | 186 mm | Awful | Sondrio in September |
| October | 7° / -1° | 6 | 17 | 8 | 186 mm | Bad | Sondrio in October |
| November | 2° / -5° | 4 | 9 | 17 | 210 mm | Awful | Sondrio in November |
| December | -2° / -10° | 4 | 10 | 17 | 115 mm | Awful | Sondrio in December |