Suzhou weather in September
September in Suzhou: hot, soaked, with poor air quality — a gamble, with 13 rainy days.
Updated September 2026 · climate normals from ERA5 reanalysis
#8 of 12 months in Suzhou · #1085 of 1413 destinations to visit in September · comfort 63/100 (tier C)
- Days
- 28°C
- Nights
- 22°C
- Wet days
- 13
- Sun
- 7.9 h
- Humidity
- 80%
- Daylight
- 12 h
Traveller notes on Suzhou in September
Other months in Suzhou
Forum posters describe April in Suzhou as often cloudy or rainy, with typical temperatures between 13-20C, though posters are consistent that there's no distinct 'rain season' here the way some regions have - rain is a regular but not overwhelming feature of the month. Posters consistently rate mid-to-late April through May as just about perfect weather-wise, with April/May and September/October generally named as the most comfortable overall stretches to visit the wider Jiangsu region. Posters flag April and May as peak tourism season, meaning real crowds and higher prices alongside the good weather. Posters describe early April specifically as bringing magnolia and some cherry blossoms into bloom. Posters generally rate April as a good, if increasingly crowded, time to visit Suzhou, occasional rain a minor trade-off for the pleasant temperatures and spring blooms.
Forum posters call October a clear step up from the still-hot early September stretch in the Shanghai/Suzhou area, with visitors reporting ideal sunny conditions, though some rain is still possible depending on the week. One timing note worth knowing: mid-October is generally considered too early for peak autumn foliage - the best color typically runs November into early December - so October garden visits lean more on the classical Suzhou gardens' architecture, rockwork and water features than on fall leaves. The bigger practical concern posters raise for October specifically isn't weather at all but crowds, since it's one of the most popular domestic travel months in China.
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Suzhou climate normals — September
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Suzhou in September
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 3 of the markets that fill it, an ordinary month(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Suzhou'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 weatherSuzhou's best weather comes in April, May and October — separate windows, not one continuous season.
Best weatherFair weatherToughest weather
What's on in Suzhou in September
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Hazard
Typhoon season
15 Jul – 30 Sep · usuallySuzhou is inland of the landfalls but not of the rain. When a storm crosses Shanghai or Zhejiang the old town floods at the canal edges, gardens close early and trains through the delta are cut for a day. Source ↗
- Nature
Osmanthus in flower
20 Sep – 20 Oct · usuallyWildflowers & bloomsYou smell it before you see it, for about three weeks, all over the old town. Lingering Garden and the Master of the Nets are the places it hangs heaviest.
- Season
Hairy crab season
25 Sep – 15 Dec · usuallyForaging seasonYangcheng Lake is the name every restaurant in China claims in autumn, and this is the lake. Females first in October, males from November; the genuine ones are priced accordingly. Source ↗
Nearby, and something's on
Within 300 km of Suzhou — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Suzhou?
Suzhou in September — FAQ
- Is September a good time to visit Suzhou?
- September in Suzhou: hot, soaked, with poor air quality — a gamble, with 13 rainy days. It ranks #8 of 12 months for Suzhou on SeasonMap's comfort score (63/100).
- What is the weather like in Suzhou in September?
- In September, Suzhou averages a daily high of 28.1°C and a low of 22.2°C, with about 155.6 mm of rain over roughly 12.7 rainy days.
- What is the air quality in Suzhou in September?
- Suzhou has a mean US Air Quality Index of about 103 in September.
Within 300 km: Shanghai's Osmanthus in flower around 20 Sep – 20 Oct, and Hangzhou's Qiantang tidal bore around 10 Sep – 12 Oct.