Tainan weather in May
May in Tainan: hot, soaked, with very humid — a gamble, with 18 rainy days.
#10 of 12 months in Tainan · #868 of 897 destinations to visit in May · comfort 54/100 (tier D)
Updated June 2026 · climate normals from ERA5 reanalysis
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Tainan climate normals — May
| Daytime high | 29°C / 85°F | 🥵 hot |
|---|---|---|
| Nighttime low | 24°C / 76°F | |
| Rainfall | 316 mm / 12.4 in | ⛈ soaked |
| Rainy days | 18 days | |
| Humidity | 84% | 💦 very humid |
| Dew point | 23°C / 73°F | |
| Sunshine | 9.2 h/day | |
| Daylight | 13.2 h | |
| Wind | 13 km/h / 8 mph | |
| Air quality (US AQI) | 89 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Tainan in May — FAQ
- Is May a good time to visit Tainan?
- May in Tainan: hot, soaked, with very humid — a gamble, with 18 rainy days. It ranks #10 of 12 months for Tainan on SeasonMap's comfort score (54/100).
- What is the weather like in Tainan in May?
- In May, Tainan averages a daily high of 29.2°C and a low of 24.4°C, with about 316 mm of rain over roughly 18.4 rainy days.
- What is the air quality in Tainan in May?
- Tainan has a mean US Air Quality Index of about 89 in May.