Climate Insights for Zhoushan

The climate in Zhoushan is temperate. The average annual temperature is 18°C and approximately 1569mm of precipitation falls per year. Zhoushan receives a notable amount of rainfall throughout the year, including during its driest month. Zhoushan is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, September. The coldest months are February, January, March, when temperatures can drop to 7°C.

Temperatures in Zhoushan vary considerably across the year, with a 21°C difference between the coldest and warmest months. The warmest month is August, when average highs reach 28°C and the mean temperature sits around 28°C. February is the coolest month, with minimum temperatures around 7°C and an average of 8°C. Daily temperature variation is modest, with an average difference of 2°C between highs and lows. The sharpest temperature change occurs between November and December, with a 6°C shift in average temperatures.

Zhoushan is a fairly wet location, receiving approximately 1569mm of precipitation annually, which averages out to around 131mm per month. The wettest month is June, averaging 305mm of rainfall. May and September also tend to see above-average precipitation. The driest month is December, with just 69mm. That's 237mm less than June, the wettest month. Precipitation varies noticeably between seasons, with the first half (January to June) of the year generally seeing more rainfall.

Zhoushan is moderately windy, with an average annual wind speed of 22km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is October, averaging 25km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in June, with average winds dropping to 19km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 6km/h between the calmest and windiest months. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 23km/h in winter, 20km/h in spring, 21km/h in summer, 23km/h in autumn.

It is currently summer in Zhoushan, which began on June 21, 2026. Zhoushan 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 28°C, while the coldest stretch bottoms out in February near 7°C. Autumn is next, beginning on September 23, 2026 (9 days from now).

The best time to visit Zhoushan is during November, when the weather is most comfortable for travellers. During these months, average temperatures hover around 17°C with modest rainfall averaging 91mm per month. By contrast, August can be uncomfortably hot with highs reaching 28°C, while February is the coldest period with lows dropping to 7°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 Zhoushan 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. 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.