Suzhou weather in September
September in Suzhou: warm, soaked, with poor air quality — fine if you can take 11 rainy days.
#7 of 12 months in Suzhou · #717 of 897 destinations to visit in September · comfort 67/100 (tier C)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Suzhou in September
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Suzhou climate normals — September
| Daytime high | 28°C / 82°F | 🌤 warm |
|---|---|---|
| Nighttime low | 22°C / 71°F | |
| Rainfall | 152 mm / 6 in | ⛈ soaked |
| Rainy days | 11 days | |
| Humidity | 82% | 💦 very humid |
| Dew point | 21°C / 69°F | |
| Sunshine | 8.2 h/day | |
| Daylight | 12.3 h | |
| Wind | 18 km/h / 11 mph | |
| Air quality (US AQI) | 103 | 😷 poor |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Suzhou in September — FAQ
- Is September a good time to visit Suzhou?
- September in Suzhou: warm, soaked, with poor air quality — fine if you can take 11 rainy days. It ranks #7 of 12 months for Suzhou on SeasonMap's comfort score (67/100).
- What is the weather like in Suzhou in September?
- In September, Suzhou averages a daily high of 27.5°C and a low of 21.6°C, with about 151.8 mm of rain over roughly 11 rainy days.
- What is the air quality in Suzhou in September?
- Suzhou has a mean US Air Quality Index of about 103 in September.