Climate Insights for Changshu

The climate in Changshu is temperate. The average annual temperature is 17°C and approximately 1320mm of precipitation falls per year. Changshu receives a notable amount of rainfall throughout the year, including during its driest month. Changshu is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, June. The coldest months are January, December, February, when temperatures can drop to 2°C. Light snow can occur between January and February.

Temperatures in Changshu vary considerably across the year, with a 31°C difference between the coldest and warmest months. The warmest month is August, when average highs reach 33°C and the mean temperature sits around 29°C. January is the coolest month, with minimum temperatures around 2°C and an average of 5°C. Daily temperature variation is modest, with an average difference of 7°C between highs and lows. The sharpest temperature change occurs between November and December, with a 7°C shift in average temperatures.

Changshu is a fairly wet location, receiving approximately 1320mm of precipitation annually, which averages out to around 110mm per month. The wettest month is June, averaging 246mm of rainfall. July and September also tend to see above-average precipitation. The driest month is December, with just 36mm. That's 210mm less than June, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic. Light snowfall can occur between January and February, totalling around 7cm annually. February is the snowiest month with approximately 3cm.

Changshu is mildly breezy, with an average annual wind speed of 16km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is April, averaging 18km/h, though still comfortable for most outdoor activities. The calmest conditions occur in September, with average winds dropping to 15km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 3km/h between the calmest and windiest months.

It is currently spring in Changshu, which began on March 20, 2026. Changshu is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in August at around 33°C, while the coldest stretch bottoms out in January near 2°C. Summer is next, beginning on June 21, 2026 — 89 days from now.

The best time to visit Changshu is during April and October, when the weather is most comfortable for travellers. During these months, average temperatures hover around 18°C with modest rainfall averaging 82mm per month. By contrast, August can be uncomfortably hot with highs reaching 33°C, while January is the coldest period with lows dropping to 2°C. Despite being the best months overall, some rain is still likely — pack a waterproof layer and plan a mix of indoor and outdoor activities.

The table below shows monthly climate averages for Changshu based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.