Shanghai weather in September

September in Shanghai: hot, soaked, with very humid — a good time to visit.

#8 of 12 months in Shanghai · #496 of 604 destinations to visit in September · comfort 63/100 (tier C)

Updated June 2026 · climate normals from ERA5 reanalysis

Shanghai climate normals — September

Daytime high27°C / 81°F🥵 hot
Nighttime low22°C / 71°F
Feels like (high)30°C / 86°F
Rainfall183 mm / 7.2 in⛈ soaked
Rainy days13 days
Humidity82%💦 very humid
Dew point21°C / 70°F
Sunshine7.9 h/day
Daylight12.3 h
Wind17 km/h / 11 mph
Air quality (US AQI)94🙂 moderate

Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.

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Shanghai in September — FAQ

Is September a good time to visit Shanghai?
September in Shanghai: hot, soaked, with very humid — a good time to visit. It ranks #8 of 12 months for Shanghai on SeasonMap's comfort score (63/100).
What is the weather like in Shanghai in September?
In September, Shanghai averages a daily high of 27.1°C and a low of 21.9°C, with about 182.8 mm of rain over roughly 13.2 rainy days.
What is the air quality in Shanghai in September?
Shanghai has a mean US Air Quality Index of about 94 in September.

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