Chengdu Weather in September

Season: Autumn
Overview: 
1.    Chengdu’s weather in September gradually turns cool, and be aware of occasional temperature fluctuation. 
2.    September has moderate precipitation in the main form of drizzles, and the city might experience overcast hours per day. 
3.    September is a shoulder travel season in Chengdu, suitable for travelers targeting for a peaceful and budget-friendly experience. 
 In September, Chengdu experiences the transitional period from summer to autumn. An overall drop in temperature, though occasional fluctuations exist, characterizes the weather. 

In the first half of the month, daytime highs range from 28 to 33°C (82-91°F), while the second half sees the daytime highs of 24-28°C (75-82°F). After sunset, the temperature can drop significantly: this month’s nighttime lows hover between 16 and 22°C (61-72°F), with the lowest temperature of only 15 degrees Celsius (59 degrees Fahrenheit). 

In addition, as cold air masses strike frequently in September, the temperatures may drop suddenly and significantly. The daily high temperature on September 23, 2022, was only 17°C (63°F), but in the past few days, the daily high always stayed around 25°C (77°F).
 In general, September brings moderate rainfall, with an average precipitation of 119 mm, lighter than in summer. However, there are quite a few rainy days, averaging 16 days monthly. The rain is mainly in the form of light drizzles, though heavy downpours also exist. Regardless of the type of rain, it mostly occurs at night, resulting in limited influence on your outdoor travel plans. 

However, it’s possible to experience heavy downpours for several days in a row this month, causing urban flooding and mudslides in the mountain areas. Therefore, you are advised to stay informed about weather alerts and adjust your travel schedules. 
 Frequent overcast days, considerable rainfall, and Chengdu’s basin terrain contribute to a pretty humid climate in September. The average humidity level reaches about 81%. At the beginning of the month, this high humidity and high heat might make you feel quite miserable, especially around noon. Don’t worry, once the temperature cools down as time goes by, the muggy feeling will ease a lot. At that time, this kind of damp air, in fact, smooths your outdoor journey. 
 In September, Chengdu experiences considerable daylight hours, about 12-12.5 hours. However, you still have very limited prime outdoor sightseeing time available, requiring you to plan your trip wisely, since the sunshine hours are scarce at around 3 hours per day on average this month: In addition to the relatively frequent rainy and overcast moments, there are also many foggy hours in September in Chengdu, particularly during early mornings and evenings, since the cold air masses strike frequently and the climate is humid. Therefore, if you wish to appreciate the outdoor scenery clearly, it’s advisable to avoid these two time periods. 

Note: The UV rays during midday hours might still bother you: the maximum UV levels can reach 9. 
 Yes, it’s a good choice to visit Chengdu in September. 

Chengdu’s climate gradually shakes off the summer heat in September, so it’s a good time for outdoor sightseeing. Even though the rain is frequent in the forms of both drizzles and heavy downpours, it usually falls at night and doesn’t last for too long. With a portable raincoat, you can totally have fun in the urban area. 

In addition, the number of tourists in Chengdu drops significantly this month, as most schools start their new term. So, attractions become less crowded, hotels are easy to book, and prices are quite reasonable.