Climate Insights for Sansha

The climate in Sansha is hot. The average annual temperature is 27°C and approximately 1335mm of precipitation falls per year. October is the wettest month, receiving around 286mm of rainfall. Sansha is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: June, August, July. The coldest months are January, February, December, when temperatures can drop to 23°C.

Sansha has relatively stable temperatures year-round, staying within a 7°C range. The warmest month is June, when average highs reach 30°C and the mean temperature sits around 29°C. January is the coolest month, with minimum temperatures around 23°C and an average of 24°C. Daily temperature variation is modest, with an average difference of 1°C between highs and lows.

Sansha is a fairly wet location, receiving approximately 1335mm of precipitation annually, which averages out to around 111mm per month. The wettest month is October, averaging 286mm of rainfall. September and July also tend to see above-average precipitation. The driest month is March, with just 14mm. That's 272mm less than October, 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.

Sansha is very windy, with an average annual wind speed of 30km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is December, averaging 42km/h, which can feel quite blustery and may affect outdoor activities. The calmest conditions occur in September, with average winds dropping to 24km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 18km/h gap 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 36km/h in winter, 25km/h in spring, 28km/h in summer, 31km/h in autumn.

It is currently spring in Sansha, which began on March 20, 2026. Sansha 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 June at around 30°C, while the coldest stretch bottoms out in January near 23°C. Summer is next, beginning on June 21, 2026 — 88 days from now.

The best time to visit Sansha is during January, February and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 24°C with modest rainfall averaging 41mm per month. By contrast, June can be uncomfortably hot with temperatures reaching 30°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

The table below shows monthly climate averages for Sansha 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.