SeasonMapAlishan (Alishan National Scenic Area) weather in September
Taiwan
September in Alishan: nice, soaked, with muggy air — fine if you can take 23 rainy days.
#12 of 12 months in Alishan · #959 of 1383 destinations to visit in September · comfort 68/100 (tier C)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Alishan in September
No notes yet. Open Alishan on the map to add the first one.
Alishan climate normals — September
| Daytime high | 19°C / 67°F | 😎 nice |
|---|---|---|
| Nighttime low | 13°C / 56°F | |
| Feels like (high) | 21°C / 70°F | |
| Rainfall | 374 mm / 14.7 in | ⛈ soaked |
| Rainy days | 23 days | |
| Humidity | 88% | 💦 very humid |
| Dew point | 14°C / 57°F | |
| Sunshine | 9.3 h/day | |
| Daylight | 12.3 h | |
| Wind | 5 km/h / 3 mph | |
| Air quality (US AQI) | 57 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Alishan in September
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
Quietschool holidays in 3 of the markets that fill it, one of its worst months for weather(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Alishan's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Toughest weatherAlishan's best weather comes in February, November and December — separate windows, not one continuous season.
September coincides with Typhoon and landslide season.
Best weatherFair weatherToughest weather
What's on in Alishan in September
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Hazard
Typhoon and landslide season
1 Jul – 15 Oct · usuallyTyphoon seasonClosuresThe mountain road and the forest railway are the first things to shut when a system parks over the island. Repairs can take a season, so check the line is running before you plan around it. Source ↗
- Season
Wet season
MonsoonRisk23 rainy days and about 374 mm in the month — the real kind of rainy season, not afternoon showers.
from the climate normals
Nearby, and something's on
Within 300 km of Alishan — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Alishan?
Alishan in September — FAQ
- Is September a good time to visit Alishan?
- September in Alishan: nice, soaked, with muggy air — fine if you can take 23 rainy days. It ranks #12 of 12 months for Alishan on SeasonMap's comfort score (68/100).
- What is the weather like in Alishan in September?
- In September, Alishan averages a daily high of 19.2°C and a low of 13.4°C, with about 374.4 mm of rain over roughly 23.3 rainy days.
- What is the air quality in Alishan in September?
- Alishan has a mean US Air Quality Index of about 57 in September.
Other months in Alishan
Compare Alishan in September
Warmer or cooler than Alishan in September
Similar destinations in East Asia — September
Within 300 km: Sun Moon Lake's Cross-lake Swimming Carnival around 10 Sep – 5 Oct, and Kenting's Raptor migration around 25 Sep – 25 Oct.