Hangzhou weather in September
September in Hangzhou: hot, rainy, with poor air quality — a good time to visit.
#8 of 12 months in Hangzhou · #490 of 604 destinations to visit in September · comfort 63/100 (tier C)
Updated June 2026 · climate normals from ERA5 reanalysis
Hangzhou climate normals — September
| Daytime high | 28°C / 82°F | 🥵 hot |
|---|---|---|
| Nighttime low | 21°C / 70°F | |
| Feels like (high) | 31°C / 88°F | |
| Rainfall | 145 mm / 5.7 in | 🌧 rainy |
| Rainy days | 12 days | |
| Humidity | 83% | 💦 very humid |
| Dew point | 21°C / 70°F | |
| Sunshine | 7.8 h/day | |
| Daylight | 12.3 h | |
| Wind | 14 km/h / 8 mph | |
| Air quality (US AQI) | 112 | 😷 poor |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Hangzhou in September — FAQ
- Is September a good time to visit Hangzhou?
- September in Hangzhou: hot, rainy, with poor air quality — a good time to visit. It ranks #8 of 12 months for Hangzhou on SeasonMap's comfort score (63/100).
- What is the weather like in Hangzhou in September?
- In September, Hangzhou averages a daily high of 27.9°C and a low of 21.1°C, with about 144.9 mm of rain over roughly 11.8 rainy days.
- What is the air quality in Hangzhou in September?
- Hangzhou has a mean US Air Quality Index of about 112 in September.