Sanya, on the southern tip of Hainan Island, boasts a tropical monsoon climate with warm temperatures and abundant sunshine year-round. The city experiences a hot, wet season from May to October and a warm, dry season from November to April. Sanya’s consistently pleasant weather makes it one of China’s top destinations for beach holidays and outdoor activities.
The best times to travel section shows how the months compare for a visit, so you can find the time of year that fits what you want to do.
Background colours of the months:
The colour shows the typical temperature: yellow (hot), green (mild) and blue (cold). How strong the colour is shows the travel season: full colour means high season, soft colour means shoulder season and soft-striped means off season.
Weather symbols:
Each month has one symbol showing what the weather is typically like, such as hot and sunny, freezing or a rainy or snowy season. Use them to quickly spot months that match the weather you want, or to avoid the ones that don't.
Crowdedness:
The people icon shows how busy the place usually is. The more people, the more crowded it gets.
Additional notes:
The grey info boxes point out special things worth knowing, like recurring weather issues or seasonal events.
Sanya’s tropical climate means little variation in temperature throughout the year. Average annual temperatures hover around 25°C, with daytime highs ranging from 24°C in January to 32°C in June and July. Even in the coolest months (December–February), daytime temperatures rarely fall below 20°C, and nights remain mild at 17–20°C. The sea is always warm, with water temperatures between 23°C in winter and 30°C in summer, making swimming possible year-round.
The city has two main seasons: a wet, humid monsoon season from May to October and a dry, sunny season from November to April. The wet season brings intense but brief tropical downpours, especially in August and September, when monthly rainfall can exceed 250 mm and humidity is very high. Typhoons occasionally affect the area in summer and early autumn, but storms are usually short-lived. The dry season is characterised by clear skies, gentle sea breezes, and comfortable humidity, with monthly rainfall dropping to 20–40 mm. Sanya enjoys about 2,500–2,600 hours of sunshine annually, with up to 7 hours of sun per day in the dry season. Winds are generally light, averaging 2–4 m/s, but can pick up during storms. Thanks to its latitude and marine influence, Sanya never sees snow or frost, and flowers bloom year-round.
| Average climate data for Sanya, China | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Average maximum temperature (°C) | 26 | 27 | 29 | 31 | 32 | 32 | 32 | 31 | 31 | 30 | 29 | 27 | 32 |
| Average minimum temperature (°C) | 18 | 20 | 22 | 24 | 26 | 26 | 26 | 25 | 25 | 23 | 21 | 19 | 18 |
| Average precipitation (mm) | 8 | 13 | 19 | 43 | 143 | 198 | 191 | 220 | 252 | 233 | 58 | 11 | 1,388 |
| Average rainfall days (days) | 4 | 4 | 4 | 6 | 10 | 14 | 14 | 16 | 17 | 14 | 7 | 4 | 111 |
| Average water temperature (°C) | 23 | 23 | 23 | 26 | 29 | 30 | 30 | 29 | 28 | 27 | 27 | 25 | 27 |
| Average daily daylight hours (h) | 11 | 11 | 12 | 12 | 13 | 13 | 13 | 12 | 12 | 11 | 11 | 11 | 12 |
| Average daily sunshine hours (h) | 5 | 5 | 5 | 6 | 7 | 6 | 7 | 6 | 6 | 6 | 6 | 6 | 6 |
| Average UV index | 9 | 11 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 10 | 9 | 8 | 11 |
The best time to visit Sanya is from October to April, when the weather is warm, dry, and sunny, with daytime highs of 24–28°C and little rain. These months offer the most comfortable climate for beach activities, water sports, and sightseeing, making Sanya a top winter escape in China.
The least favourable time is from July to September, when Sanya is hottest, most humid, and wettest. Frequent heavy showers, high humidity, and occasional typhoons can disrupt travel plans, though sunshine often returns quickly after rain.
Sanya has a tropical monsoon climate with warm temperatures (24–32°C) and abundant sunshine all year. The wet season (May–October) is hot and humid, while the dry season (November–April) is sunny and comfortable.
The best time to visit Sanya is from October to April, when the weather is warm, dry, and sunny. These months are ideal for beach holidays, water sports, and exploring the island.
Sanya receives most of its annual rainfall (about 1,280 mm) from May to October, with August and September being the wettest months. Rain usually comes in brief, heavy showers, followed by sunshine.
Sea temperatures in Sanya range from 23°C in winter to 30°C in summer, making swimming and water activities possible year-round.
Typhoons can occasionally affect Sanya, mainly from July to September. Storms are usually brief but can bring heavy rain and strong winds, so it’s wise to check weather forecasts in summer.
Yes, winter (December–February) in Sanya is warm and sunny, with highs around 24–26°C. It’s a popular time for beach holidays, especially for visitors escaping colder northern climates.
Pack light, breathable clothing, swimwear, sunblock, and sunglasses for all seasons. Bring a rain jacket or umbrella for the wet season and a light jacket for cooler evenings in winter.
The warmest month, with the highest average maximum temperature, is May (32.1 °C). The month with the lowest average maximum temperature is January (26.2 °C). Overall, the average maximum temperature over the whole year is 29.7 °C.
The month with the highest average minimum temperature is June (26.1 °C). The coldest month, with the lowest average minimum temperature, is January (18.5 °C). Overall, the average minimum temperature over the whole year is 23 °C.
The month with the highest average water temperature is July (29.9 °C). The month with the lowest average water temperature is February (23 °C). Overall, the average water temperature over the whole year is 26.7 °C.
The wettest month, with the highest amount of precipitation, is September (252.1 mm). The driest month, with the least amount of precipitation, is January (8 mm). Over the whole year there are 1,388.1 mm of rainfall on average.
The month with the most days of rain is September (16.9 days). The month with the fewest days of rain is January (3.5 days). Over the whole year there are 111.4 days of rain on average.
The months with the longest days, so the most daylight, are June and July (Average daylight: 13 h). The months with the shortest days, so the least daylight, are January and December (Average daylight: 11 h). Over the whole year there are 11.9 h of daylight per day on average.
The month with the most sunshine per day is May (Average sunshine: 6.9 h). The month with the least sunshine per day is February (Average sunshine: 4.9 h). Over the whole year there are 5.9 h of sunlight per day on average.
The months with the highest average UV index are March, April, May, June, July, August and September (UV index: 12). The month with the lowest average UV index is December (UV index: 8). Over the whole year the average UV index is 10.9.
