Suzhou Weather and Climate in September

September in Suzhou marks the beginning of autumn with warm, humid weather that gradually feels more comfortable than the peak summer months. Daytime highs typically range from 26–29°C (79–84°F) in the early part of the month, cooling slightly to 24–27°C (75–81°F) by late September. Nights remain warm, often dropping to 18–22°C (64–72°F). Rainfall is moderate to high, averaging around 100–156 mm over 9–12 days, mostly as short showers, with a lingering risk of typhoons early in the month.

This is a good shoulder season for visiting Suzhou. You’ll enjoy warm conditions suitable for garden strolls and canal boat rides, beautiful late-summer greenery with early autumn hints, fewer crowds than July and August, and more attractive hotel rates.

Suzhou

31.3000°N, 120.5900°E

Sunrise 13:22

Sunset 02:42

27°C

Moderate rain

Feels Like 30°C

Humidity 94%

Wind 3.4 m/s

Pressure 1002 hPa

Visibility 10 km

Clouds 100%

2026-08-14 17:31 Data by OpenWeatherMap

Suzhou Season in September: Early Autumn

September brings the welcome transition from hot summer to early autumn in Suzhou. Days remain warm and suitable for outdoor exploration, while evenings start to feel slightly cooler and more refreshing. Precipitation is still noticeable but begins to decrease compared to the peak rainy months.

It is regarded as a favorable time to visit Suzhou — pleasant temperatures for sightseeing, manageable rainfall, and a more relaxed pace at the classical gardens and water towns.

Cooling but Still Warm Temperatures

September delivers easing summer heat to Suzhou. In the first half of the month, daytime highs often reach a warm 27–29°C (81–84°F) on sunny days, with lows around 21–23°C (70–73°F). Midday sightseeing remains comfortable with light clothing.

In the second half, temperatures cool gradually. Highs typically hover around 24–27°C (75–81°F), while lows fall to 18–21°C (64–70°F). The day-night temperature difference becomes more noticeable, making mornings and evenings particularly pleasant for canal walks and garden visits.

Moderate Precipitation and Possible Typhoons

Suzhou sees moderate rainfall in September, averaging about 100–156 mm across roughly 9–12 days, often as short showers or thunderstorms. Rainfall tends to be lower than in August, but occasional heavier downpours can occur.

Cloudy and partly sunny days are common. September is still within the typhoon season, though direct impacts are relatively rare. Brief rain can actually refresh the air and enhance the lush scenery of the classical gardens.

2 Days Suzhou and Hangzhou Heaven Tour from Shanghai by Bullet Train

Tour Route：Suzhou-Hangzhou

Tour Type：City Tours

2 Days

4 Places

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Daylight Hours and Sunshine

Daylight remains long, starting at around 12.5 hours early in the month and shortening to about 11.8 hours by late September. Sunshine hours average 5–7 per day. The UV index is still relatively high on clearer days.

Averages for Suzhou Weather in September

Temperature: 23–24°C / 73–75°F High Temperature: 27°C / 81°F Low Temperature: 21°C / 70°F Humidity: ~75–78% Rainfall: 100–156 mm Rainy Days: 9–12 days

A Recommended Visiting Month

September is a recommended time for visiting Suzhou. As summer heat and crowds ease, you can enjoy the Humble Administrator’s Garden, Lingering Garden, Tiger Hill, and ancient canals with more comfort and space. Hotel rates are often better than in peak summer.

The warm weather and lush greenery (with early autumn colors starting to appear) make it ideal for photography and leisurely exploration of this garden city.

Recommended Outfits for Visiting Suzhou in September

Daytime: Light, breathable clothing such as short-sleeve shirts, polo shirts, shorts or light trousers, and comfortable dresses. Choose moisture-wicking fabrics due to humidity.

Evenings: Bring a thin long-sleeve shirt, light sweater, or jacket for cooler evenings and air-conditioned spaces.

Shoes: Comfortable walking shoes or sneakers are essential — you’ll do plenty of strolling through gardens and ancient streets.

Others: A compact umbrella or light rain shell for occasional showers, high-SPF sunscreen and sunglasses, a reusable water bottle, and a small daypack.

Advice for Your Suzhou Trip in September

September offers a pleasant window to experience Suzhou’s classic charm before the cooler autumn peak. Wander through the classical gardens, take a boat ride on the canals, explore Pingjiang Road or Shantang Street, and visit nearby water towns like Zhouzhuang or Tongli.

Tips:

• Dress lightly with some layers to adjust to temperature changes and air conditioning.
• Carry a small umbrella as showers can appear suddenly.
• Book garden tickets in advance on weekends.
• Enjoy seasonal local dishes and fresh produce.

Recommended Attractions: Humble Administrator’s Garden, Lingering Garden, Tiger Hill, Pingjiang Road, Shantang Street, and day trips to water towns.

September delivers warm, humid weather with early autumn vibes in Suzhou. Pack light layers and rain gear, embrace the garden scenery, and prepare for a relaxing and memorable trip. Safe travels!