Chengdu Weather and Climate in September

September in Chengdu signals the end of the hot, humid summer and the gradual arrival of early autumn. Daytime highs typically range from 26–29°C (79–84°F) in the early part of the month, cooling to 23–26°C (73–79°F) by late September. Nights remain warm but become more comfortable, often dropping to 17–21°C (63–70°F). Rainfall is still noticeable, averaging around 80–120 mm over 10–14 days, mostly as afternoon or evening showers.

This is a good shoulder season for visiting Chengdu. You’ll enjoy slightly more comfortable temperatures than midsummer, lush greenery, thinner crowds after the peak summer period, and more attractive hotel rates.

Chengdu

30.5700°N, 104.0700°E

Sunrise 14:29

Sunset 03:47

37°C

Few clouds

Feels Like 40°C

Humidity 36%

Wind 2 m/s

Pressure 1001 hPa

Visibility 10 km

Clouds 12%

2026-08-14 17:55 Data by OpenWeatherMap

Chengdu Season in September: Early Autumn

September brings the welcome transition from hot summer to milder early autumn weather in Chengdu. Days remain warm and suitable for outdoor activities, while evenings start to feel refreshingly cooler. Precipitation is moderate but begins to decrease compared to July and August.

It is regarded as a favorable month to visit Chengdu — more bearable heat, pleasant conditions for sightseeing, and a more relaxed atmosphere at major attractions.

Cooling but Still Warm Temperatures

September delivers easing summer heat to Chengdu. In the first half of the month, daytime highs often reach 27–29°C (81–84°F) on sunnier days, with lows around 20–22°C (68–72°F). Midday can still feel warm and humid, but it is noticeably more comfortable than peak summer.

In the second half, temperatures cool gradually. Highs typically hover around 23–26°C (73–79°F), while lows fall to 17–20°C (63–68°F). The growing day-night temperature difference makes mornings and evenings particularly pleasant for visiting the panda base or relaxing in parks.

Moderate Precipitation and Frequent Cloudy Days

Chengdu sees moderate rainfall in September, averaging about 80–120 mm across roughly 10–14 days, often as short showers or thunderstorms. Rainfall tends to decrease as the month progresses.

Cloudy, overcast, and occasional foggy conditions remain typical of the Sichuan Basin climate. Sunny breaks become more frequent later in September, offering better opportunities for photography and outdoor exploration.

8 Days Chengdu Daocheng Yading Adventure Tour

Tour Route：Chengdu-Xinduqiao in Kangding City, Garze-Daocheng Yading-Xinduqiao in Kangding City, Garze-Ganhaizi in Danba County, Garze-Chengdu

Tour Type：City Tours / Adventure Tours / Hiking Tours

8 Days

4 Places

View Detail

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 4–6 per day due to frequent cloud cover. The UV index is moderate to high on clearer days.

Averages for Chengdu Weather in September

Temperature: 22–24°C / 72–75°F High Temperature: 26°C / 79°F Low Temperature: 19°C / 66°F Humidity: ~78–82% Rainfall: 80–120 mm Rainy Days: 10–14 days

A Recommended Visiting Month

September is a recommended time for visiting Chengdu. As summer heat and crowds ease, you can enjoy the Giant Panda Research Base, Jinli Ancient Street, People’s Park, and Wuhou Shrine with more comfort and space. Hotel rates are often better than in July and August.

The warm yet improving weather and lush greenery (with early autumn colors beginning to appear) make it ideal for both city sightseeing and nearby day trips.

Recommended Outfits for Visiting Chengdu in September

Daytime: Light, breathable clothing such as short-sleeve shirts, polo shirts, shorts or light trousers, and comfortable dresses. Moisture-wicking fabrics help with humidity.

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

Shoes: Comfortable walking shoes are essential — you’ll be strolling through parks, streets, and attractions.

Others: A compact umbrella or light rain shell for occasional showers, high-SPF sunscreen, a reusable water bottle, and mosquito repellent if visiting greener areas.

Chengdu Dujiangyan

Chengdu Research Base of Giant Panda Breeding

Advice for Your Chengdu Trip in September

September offers a pleasant window to experience Chengdu’s laid-back lifestyle and famous attractions. Visit the giant pandas in the morning, relax in People’s Park with locals, explore Jinli Street at night, or take day trips to Leshan Giant Buddha or Mount Emei.

Tips:

• Dress lightly with some layers to adjust to temperature changes and strong air conditioning.
• Carry a small umbrella as showers can appear suddenly in the afternoon.
• Start outdoor activities early or late in the day to avoid the warmest hours.
• Enjoy seasonal hotpot, spicy dishes, and fresh local produce.

Recommended Attractions: Chengdu Research Base of Giant Panda Breeding, Jinli Ancient Street, Wuhou Shrine, Du Fu Thatched Cottage, People’s Park, and day trips to Leshan or Mount Emei.

September delivers warm, gradually cooling weather with early autumn vibes in Chengdu. Pack light layers and rain gear, embrace the relaxed Sichuan atmosphere, and prepare for a comfortable and enjoyable trip. Safe travels!