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Chengdu in September: Weather, Average temperature and Climate

Take a look at past year’s weather for Chengdu in September and see if it is worth visiting.
Check flight prices to Chengdu on Avionero:
September

Weather in Chengdu in September 2025

OK Weather
Warm
🌧️
Rainy
Chengdu in September usually sees fair weather conditions, with an average daily high temperature of +77°F and roughly 3 sunny days. However, you should prepare for about 21 rainy days with an average precipitation of 138 mm. The weather is changeable so pack for every eventuality. Search flights in one click on Avionero.

Average weather

☀️
+77°F
Avg. max. temperature
+55°F
Min.
+95°F
Max.
138 mm
Total precipitation
81%
Avg. humidity
1 m/s
Avg. wind
3 ☀️
Sunny Days
6 ⛅️
Cloudy
21 🌦
Rainy
Our opinion: Chengdu has OK weather in September.

Average temperature in Chengdu in September

Here are the expected maximum, average and minimum temperatures in Chengdu for September based on the historical data.
Last Year
Historical Data

The temperature in September is +82°F on average, with a range between a maximum of +91°F during the day and a minimum of +66°F at night.

The average maximum temperature goes down 21% by the end of the month, compared with the beginning of the month, from +81°F to +75°F.

Is Chengdu warm or cold in September?

Chengdu is typically warm in September.

Maximum temperatures go down compared to the previous month from +86°F to +77°F. The minimum temperature also goes down from +73°F to +66°F.

It’s generally warm, but pack a long-sleeve shirt for evenings.

Take a look at how September is compared to other months in Chengdu:

Climate in Chengdu in September

Chengdu weather looks like this, on average, in September and the surrounding months.
AugustSeptemberOctober
Avg. temperature
+86°F+77°F+70°F
Min. temperature
+61°F+55°F+37°F
Max. temperature
+108°F+95°F+90°F
Rainfall
296 mm138 mm48 mm
Wind
1 m/s1 m/s1 m/s
Humidity
81%81%81%
Air pressure
1004 HPa1011 HPa1018 HPa
Sunny days
232
Cloudy days
3611
Rainy days
242117
Snowy days
000

September weather is still as ok as in August. It’s getting colder in September. From +86°F in the day, the average maximum temperature lowers to +77°F. As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 296 mm to 138 mm. Humidity levels don’t change as the month goes on, averaging around 81%. The average wind speed doesn’t change much during September, staying around 1 m/s. The good news is there are likely to be more sunny days in September, from 2 to 3.

October brings much the same weather, it remains ok.

Wind

Wind speed in Chengdu in September based on historical data.
Last Year
Historical Data

The average wind speed is 2 m/s getting up to 3 m/s which is a light breeze; barely moving the tree leaves.

The average wind speed in Chengdu is gradually increasing during September, going from 1 m/s to 1 m/s over the course of the month.

Rain

Amount of rainfall in mm during September in Chengdu based on historical data.
Last Year
Historical Data
A chance of rain on a typical day in September stands at 57%, leading to total precipitation of around 134 mm. The maximum amount of rainfall per day is around 42 mm, which is moderate rain. September is a pretty wet month with over 17 rainy days, so don’t forget to pack an umbrella, raincoat, and a pair of wellies.
Here’s how September is compared with other months in the amount of precipitation, total mm:
Chengdu wettest month is July, where a typical day has a 74% chance of precipitation and 309 mm of rainfall per day. December, on the other hand, is the driest month with a mere 19% chance of precipitation and 7 mm of rainfall per day.

How was the weather last September in Chengdu?

This is the weather in Chengdu in September 2023:
1 September
☀️
+80°F
2 September
☀️
+89°F
3 September
☀️
+91°F
4 September
☁️
+91°F
5 September
☁️
+91°F
6 September
☀️
+89°F
7 September
☀️
+91°F
8 September
🌧️
+91°F
9 September
🌧️
+88°F
10 September
🌧️
+87°F
11 September
🌧️
+73°F
12 September
☀️
+83°F
13 September
☀️
+85°F
14 September
☀️
+84°F
15 September
☁️
+84°F
16 September
☁️
+87°F
17 September
☁️
+80°F
18 September
☁️
+78°F
19 September
☁️
+82°F
20 September
☀️
+84°F
21 September
🌧️
+83°F
22 September
☁️
+73°F
23 September
☁️
+72°F
24 September
☁️
+72°F
25 September
☁️
+73°F
26 September
☁️
+73°F
27 September
🌫️
+75°F
28 September
🌫️
+76°F
29 September
☁️
+79°F
30 September
🌧️
+75°F
In September 2023 Chengdu had 9 sunny days, 13 cloudy days, and 6 rainy days. The average maximum temperature was +82°F, with an absolute maximum of +91°F and a minimum of +72°F. The average humidity was 81%, with a maximum of 100% and a minimum of 49%. The average wind speed was 2 m/s, with a maximum of 7 m/s and a minimum of 0 m/s.
Are you planning a trip in September?

Climate Change Over the Years

This is how Chengdu climate has changed over the last 43 years.

The climate in Chengdu in September has not changed that much over the last 43 years.

The average temperature was the lowest in 1984 (+67°F) and the highest in 2020 (+73°F). The driest year was 2006 with only 736 mm of rainfall, and the wettest year was 1990 with 1678 mm.

FAQ

Frequently asked questions about the weather in Chengdu in September:

Is September a good time to visit Chengdu?

It’s always a good time to visit Chengdu, but the weather is changeable in September, so plan a mix of indoor and outdoor activities and exploring, and pack for every eventuality.

Can you sunbathe in Chengdu in September?

September is warm in Chengdu. You may enjoy some beach or pool time in the day, but pack something a tad warmer for the evening.

Is Chengdu rainy in September?

Chengdu is often rainy in September. You may get a bit damp when outside, so pack an umbrella, and maybe even a raincoat.

Is it sunny in Chengdu in September?

Usually, it’s not very sunny in Chengdu in September, often it’s pretty cloudy. Pack for any eventuality; layering can help reduce the number of bulky items needed.

Other cities in China

Check out the weather for other cities in China.

Monthly weather in Chengdu

Source of the data

For this page, we’ve looked at the typical weather in Chengdu, based on historical hourly weather data from January 1, 1979, to December 31, 2023.

For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.