September weather forecastSanya, China

Weather in September

September ushers in transitional weather in Sanya, characterized by declining temperatures, rainfall, and daylight hours. September experiences the highest amount of rainfall in the year at 251mm (9.88"), thereby marking it as the wettest month. The return of the autumn monsoon brings many overcast but warm days. As the month advances, a gradual shift to cooler and drier conditions begin. Despite the rain, September delivers a unique blend of summer warmth and autumn coolness.

Temperature

Sanya's entry into September measures an average high-temperature of a still tropical 31.2°C (88.2°F), closely parallel to the preceding month. Throughout September nights, Sanya experiences a consistent temperature average of 24.7°C (76.5°F).

Rainfall

The month with the most rainfall is September, when the rain falls for 17 days and typically aggregates up to 251mm (9.88") of precipitation.

Sea temperature

In September, the average sea temperature is 28.3°C (82.9°F).
Note: Water surface temperatures from 25°C (77°F) to 29°C (84.2°F) are considered optimal and extremely delightful for long-lasting pleasure in any water activity.

Daylight

In September, the average length of the day in Sanya is 12h and 14min.
On the first day of the month, sunrise is at 06:27 and sunset at 18:56. On the last day of September, in Sanya, sunrise is at 06:32 and sunset at 18:31 CST.

Sunshine

In Sanya, the average sunshine in September is 6h.

UV index

March through September, with an average maximum UV index of 12, are months with the highest UV index. A UV Index of 11, and more, symbolizes an extreme threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: A daily maximum UV index of 12 in September translates into the following instructions:
Undertake every vital safety procedure, as unprotected skin and eyes could sustain burns in no time. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is at its strongest, and remember that parasols or canopies do not offer full protection. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Even on overcast days, a sunscreen with a sun protection factor of no less than 30 should be generously applied and reapplied, particularly after swimming or outdoor activities. Stay alert! Reflective properties of sand and water amplify the Sun's UV radiation.