Seasonal Climate Patterns and Rainfall Concentration in Shanghai

This page presents a climate summary for Shanghai in 2025 using monthly and seasonal weather data from the Hongqiao station. The goal is to show how temperature and precipitation change through the year. This is useful for travelers, planners, and anyone interested in seasonal weather patterns.

Core Dataset: Monthly, Seasonal, and Annual Summary

Table 1. Monthly averages and seasonal aggregates for Shanghai (Hongqiao).

Climate table showing temperature, precipitation, and wind by period.
Period	Avg High (°C)	Avg Low (°C)	Mean Temp (°C)	Precipitation (mm)	Avg Wind (km/h)
Jan	11	2	6.5	18.1	11.3
Feb	9	3	6.0	17.1	11.6
Mar	16	7	11.5	106.5	12.5
Apr	26	13	19.5	15.8	13.1
May	28	18	23.0	40.0	13.8
Jun	30	22	26.0	611.3	12.1
Jul	34	26	30.0	935.4	16.0
Aug	36	27	31.5	941.6	12.1
Sep	33	25	29.0	830.4	9.7
Oct	27	21	24.0	228.1	12.1
Nov	18	11	14.5	7.4	9.2
Dec	14	6	10.0	22.9	7.6
Spring (Mar–May)	23.3	12.7	18.0	162.3	13.1
Summer (Jun–Aug)	33.3	25.0	29.2	2488.3	13.4
Fall (Sep–Nov)	26.0	20.7	23.0	1066.0	11.0
Winter (Dec–Feb)	11.3	3.7	7.5	58.1	10.2
Annual (2025)	23.5	15.1	19.3	3774.6	11.8

Visual Comparison: Skyline Conditions

Shanghai skyline under clear conditions — **Shanghai Skyline — Clear Conditions**
High visibility and minimal cloud cover.

Shanghai skyline under cloudy conditions — **Shanghai Skyline Under a Cloudy Condition**
Low cloud cover and mist reducing visibility.

Breakout: Rainfall Concentration

Rainiest Months

Month	Precipitation (mm)	Mean Temp (°C)
Aug	941.6	31.5
Jul	935.4	30.0
Sep	830.4	29.0
Jun	611.3	26.0

Analysis

Summer months dominate annual precipitation while also having the highest temperatures. This overlap increases flood risk and pressure on transport and drainage.

Summer contributes the majority of annual rainfall.
High heat coincides with peak precipitation.
Prioritize drainage and contingency planning in summer months.

Seasonal Weather Summary

Spring (Mar–May)

Mild temperatures with moderate rainfall. Good for outdoor activities.

Summer (Jun–Aug)

Hot and very wet due to monsoon. High risk of flooding; plan accordingly.

Fall (Sep–Nov)

Cooling temperatures and decreasing rainfall. Pleasant weather overall.

Winter (Dec–Feb)

Cold and dry with minimal precipitation. Low flood risk but watch for cold snaps.

Glossary

Avg High (°C): Average daily maximum temperature.
Avg Low (°C): Average daily minimum temperature.
Mean Temperature: Average of daily high and low.
Precipitation (mm): Total liquid-equivalent rainfall.