Chengdu Weather in September
China · Humid Subtropical climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
September in Chengdu sees average temperatures ranging from a low of 20.1°C (68.2°F) to a high of 27.4°C (81.3°F), with a mean of 23.3°C (73.9°F). Compared to the annual average of 17.7°C (63.9°F), this month is 5.6°C warmer than the yearly norm. Precipitation averages 121.0mm, making it approximately 26.0mm wetter than the monthly average of 94.0mm. The city receives an average of 7.1 hours of sunshine per day during September, with relative humidity averaging 78.6%. Wind speeds reach an average maximum of 12.9 km/h. For travelers, this month offers a temperature experience in Chengdu, with wetter-than-average conditions compared to the rest of the year.
Chengdu is famous for its overcast skies, and the data confirms why. The city sits in the Sichuan Basin, which creates a unique microclimate with persistent cloud cover. I visited during the pandas' outdoor season and found the mild temperatures perfect for the city's outdoor attractions. The best time to visit is March to June and September to November, when the weather is mildest.
September vs Adjacent Months
| Metric | August | September | October |
|---|---|---|---|
| Mean Temp | 27.1°C (80.8°F) | 23.3°C (73.9°F) | 17.5°C (63.5°F) |
| Rainfall | 295.2mm | 121.0mm | 65.5mm |
| Sunshine | 8.5 hrs | 7.1 hrs | 4.2 hrs |
| Humidity | 76.3% | 78.6% | 79.2% |
| Wind | 14.2 km/h | 12.9 km/h | 11.1 km/h |
| Rainy Days | 20.4 | 22.0 | 21.6 |
Seasonal Context
September falls in Autumn in the Northern Hemisphere. Autumn sees temperatures gradually cooling from summer highs. For travelers visiting Chengdu in September, the data indicates mixed conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Chengdu in September?
The average temperature in Chengdu during September ranges from 20.1°C (68.2°F) to 27.4°C (81.3°F), with a mean of 23.3°C (73.9°F).
How much does it rain in Chengdu in September?
Chengdu receives an average of 121.0mm of precipitation in September, spread across approximately 22.0 rainy days.
What should I pack for Chengdu in September?
Based on September weather data, pack layers including light jackets and t-shirts, plus an umbrella. Rain gear is essential — this month averages 121.0mm of precipitation.
Is September a good time to visit Chengdu?
September is a month with challenging conditions. Plan activities carefully and stay hydrated.
Other Months for Chengdu
Cities with Similar September Climate (Humid Subtropical)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: 30.57°, 104.07°. Timezone: Asia/Shanghai. Last updated: 2026-07-30.