SeasonMapAlishan (Alishan National Scenic Area) weather in May
Taiwan
May in Alishan: nice, soaked, with muggy air — fine if you can take 28 rainy days.
#9 of 12 months in Alishan · #1009 of 1383 destinations to visit in May · comfort 70/100 (tier B)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Alishan in May
No notes yet. Open Alishan on the map to add the first one.
Alishan climate normals — May
| Daytime high | 19°C / 66°F | 😎 nice |
|---|---|---|
| Nighttime low | 12°C / 54°F | |
| Feels like (high) | 20°C / 68°F | |
| Rainfall | 310 mm / 12.2 in | ⛈ soaked |
| Rainy days | 28 days | |
| Humidity | 85% | 💦 very humid |
| Dew point | 13°C / 55°F | |
| Sunshine | 9.2 h/day | |
| Daylight | 13.3 h | |
| Wind | 5 km/h / 3 mph | |
| Air quality (US AQI) | 76 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Alishan in May
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.
Shoulder seasonschool holidays in 2 of the markets that fill it, an ordinary month(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).
Fair weatherAlishan's best weather comes in February, November and December — separate windows, not one continuous season.
Best weatherFair weatherToughest weather
What's on in Alishan in May
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Nature
Firefly season
10 Apr – 15 May · usuallyFirefliesAlishan holds about a third of Taiwan's fireflies and the peak is a few weeks from mid-April. It is a night walk at 2,000 m, so around 8°C once the light goes. Source ↗
- Season
Wet season
MonsoonRisk28 rainy days and about 310 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 May — FAQ
- Is May a good time to visit Alishan?
- May in Alishan: nice, soaked, with muggy air — fine if you can take 28 rainy days. It ranks #9 of 12 months for Alishan on SeasonMap's comfort score (70/100).
- What is the weather like in Alishan in May?
- In May, Alishan averages a daily high of 18.8°C and a low of 12.3°C, with about 309.8 mm of rain over roughly 27.8 rainy days.
- What is the air quality in Alishan in May?
- Alishan has a mean US Air Quality Index of about 76 in May.
Other months in Alishan
Compare Alishan in May
Warmer or cooler than Alishan in May
Similar destinations in East Asia — May
Within 300 km: Sun Moon Lake's Firefly season around 1 Apr – 15 May, and Kenting's Calm sea season around 1 Apr – 30 Sep.