Sanya is warmest in April, averaging 32° by day and 22° at night. The wettest month is October with 719 mm, and the year brings about 2339 mm in total.
Month by month
| Month | High | Low | Rain | Sea | Daylight | Good for |
|---|---|---|---|---|---|---|
| January | 25° | 15° | 25 mm | 24° | 11.0 h | Sightseeing |
| February | 27° | 16° | 25 mm | 23° | 11.4 h | Beach weather |
| March | 30° | 19° | 28 mm | 25° | 11.9 h | Beach weather |
| April | 32° | 22° | 54 mm | 27° | 12.4 h | Beach weather |
| May | 32° | 24° | 189 mm | 29° | 12.9 h | Rainy season |
| June | 30° | 25° | 156 mm | 30° | 13.1 h | Mild |
| July | 31° | 25° | 282 mm | 30° | 13.0 h | Rainy season |
| August | 30° | 25° | 251 mm | 29° | 12.6 h | Rainy season |
| September | 30° | 24° | 426 mm | 30° | 12.1 h | Rainy season |
| October | 28° | 22° | 719 mm | 29° | 11.6 h | Rainy season |
| November | 27° | 20° | 159 mm | 27° | 11.1 h | Mild |
| December | 24° | 16° | 25 mm | 25° | 10.9 h | Sightseeing |
High and low are average daily maximum and minimum, rain is typical monthly total, sea is the average surface temperature, daylight is the hours between sunrise and sunset mid-month. Climate normals from NASA POWER and NOAA MUR — averages, not promises.
When to go
Beach weather: February, March and April — highs around 30°, nights no colder than 16°, and at most 54 mm of rain in a month. The sea sits at 23–27° then.
Walking the city: January and December — highs of 24–25° and no more than 25 mm of rain a month.
Wet season: May, July, August, September and October — up to 719 mm in a single month.