Click on a day for an hourly weather forecast
The weather in Alishan in September is hot. The average temperatures are between 22°C and 29°C.
You can expect rain for roughly half of the month of September in Alishan. 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 Alishan in September 2025.
If you’re planning to visit Alishan in the near future, we highly recommend that you review the 14 day weather forecast for Alishan before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 20° / 13° | 4 | 27 | 0 | 19 mm | Good | Alishan in January |
| February | 21° / 14° | 4 | 24 | 0 | 19 mm | Good | Alishan in February |
| March | 24° / 16° | 7 | 24 | 0 | 34 mm | Perfect | Alishan in March |
| April | 27° / 18° | 8 | 22 | 0 | 49 mm | Perfect | Alishan in April |
| May | 29° / 20° | 16 | 15 | 0 | 112 mm | Ok | Alishan in May |
| June | 30° / 22° | 17 | 13 | 0 | 146 mm | Ok | Alishan in June |
| July | 30° / 22° | 18 | 13 | 0 | 137 mm | Ok | Alishan in July |
| August | 30° / 22° | 19 | 12 | 0 | 197 mm | Ok | Alishan in August |
| September | 29° / 22° | 13 | 17 | 0 | 96 mm | Ok | Alishan in September |
| October | 27° / 21° | 7 | 24 | 0 | 56 mm | Good | Alishan in October |
| November | 25° / 18° | 5 | 25 | 0 | 26 mm | Perfect | Alishan in November |
| December | 21° / 14° | 5 | 26 | 0 | 23 mm | Good | Alishan in December |