Click on a day for an hourly weather forecast
The temperatures in Puerto Montt in September are quite cold with temperatures between 5°C and 12°C, warm clothes are a must.
You can expect rain for roughly half of the month of September in Puerto Montt. 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.
Our weather forecast can give you a great sense of what weather to expect in Puerto Montt in September 2025.
If you’re planning to visit Puerto Montt in the near future, we highly recommend that you review the 14 day weather forecast for Puerto Montt before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 19° / 10° | 6 | 25 | 0 | 117 mm | Good | Puerto Montt in January |
| February | 19° / 11° | 6 | 23 | 0 | 151 mm | Good | Puerto Montt in February |
| March | 17° / 10° | 8 | 23 | 0 | 168 mm | Ok | Puerto Montt in March |
| April | 15° / 8° | 10 | 20 | 0 | 223 mm | Ok | Puerto Montt in April |
| May | 12° / 7° | 13 | 18 | 0 | 333 mm | Bad | Puerto Montt in May |
| June | 10° / 6° | 15 | 15 | 0 | 394 mm | Bad | Puerto Montt in June |
| July | 9° / 5° | 13 | 18 | 0 | 326 mm | Bad | Puerto Montt in July |
| August | 10° / 5° | 14 | 17 | 0 | 362 mm | Bad | Puerto Montt in August |
| September | 12° / 5° | 11 | 19 | 0 | 212 mm | Bad | Puerto Montt in September |
| October | 14° / 6° | 10 | 21 | 0 | 199 mm | Ok | Puerto Montt in October |
| November | 16° / 7° | 8 | 22 | 0 | 205 mm | Ok | Puerto Montt in November |
| December | 18° / 9° | 8 | 23 | 0 | 198 mm | Ok | Puerto Montt in December |