Tainan weather in September
September in Tainan: hot, soaked, with very humid — a gamble, with 12 rainy days.
#8 of 12 months in Tainan · #797 of 897 destinations to visit in September · comfort 60/100 (tier C)
Updated June 2026 · climate normals from ERA5 reanalysis
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Tainan climate normals — September
| Daytime high | 30°C / 86°F | 🥵 hot |
|---|---|---|
| Nighttime low | 25°C / 77°F | |
| Rainfall | 171 mm / 6.7 in | ⛈ soaked |
| Rainy days | 12 days | |
| Humidity | 83% | 💦 very humid |
| Dew point | 24°C / 75°F | |
| Sunshine | 10.1 h/day | |
| Daylight | 12.3 h | |
| Wind | 13 km/h / 8 mph | |
| Air quality (US AQI) | 88 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Tainan in September — FAQ
- Is September a good time to visit Tainan?
- September in Tainan: hot, soaked, with very humid — a gamble, with 12 rainy days. It ranks #8 of 12 months for Tainan on SeasonMap's comfort score (60/100).
- What is the weather like in Tainan in September?
- In September, Tainan averages a daily high of 29.9°C and a low of 25.1°C, with about 171.1 mm of rain over roughly 11.8 rainy days.
- What is the air quality in Tainan in September?
- Tainan has a mean US Air Quality Index of about 88 in September.