September weather forecast
Sanya, China

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 in Sanya delivers a unique blend of summer warmth and autumn coolness.

Temperature

As August transitions into September, the average high-temperature in Sanya rests at a still tropical 31.2°C (88.2°F), maintaining a close resemblance to the previous month. An average low-temperature of 24.7°C (76.5°F) is common during the nights of September.

Rainfall

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

Sea temperature

In Sanya, the average seawater temperature in September is 28.3°C (82.9°F).
Note: Water activities in surface temperatures between 25°C (77°F) and 29°C (84.2°F) are seen as exceptional and extremely agreeable for lengthened time spans.

Daylight

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

Sunshine

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 value of 11, and more, symbolizes an extreme health hazard from unprotected exposure to Sun's UV rays for average individuals.
Note: In September, the UV index of 12 transforms into the following advice:
Implement all necessary safeguards, unprotected skin might suffer burns rapidly. Avoid direct Sun exposure and seek shade between 10 a.m. and 4 p.m., when UV radiation is at its peak, but keep in mind that not all shade structures provide complete protection. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Even on a cloudy day, sunscreen with a minimum SPF of 30 should be used liberally and reapplied often, especially after a swim or outdoor activity. Attention! UV radiation is markedly stronger with water and sand reflections.