Hainan Island Climate, Weather in Hainan, Best time to visit Hainan Island

Many tourists will check Hainan’s climate or weather before booking their travels to Hainan Island. As a local tour operator based on Hainan Island, we offer updated information on Hainan Island climate & weather with personal experiences.

Basically, Hainan Island enjoys a monsoon subtropical AND tropical climate with annual average temperatures ranging between 18°C (65°F) and 28°C (82°F) and annual rainfall between 1,500 mm and 2,000 mm. An average of about 12 hours per day have daylight and more than 300 days of a year, on average, are sunny.

Though Hainan Island is not a big place, there are two climates: Subtropical in the North (Haikou and its surrounding areas), Tropical Climate in the South (Sanya, the beach destination for all visitors to Hainan Island)

Climate and Average Sea Water Temperature of Sanya China, a very popular Tropical Destination of China:

The average annual temperatures of Sanya Hainan hover at a beautiful 22-28 °C Celsius and annual rainfall between 1,500 mm and 2,000 mm. An average of about 12 hours per day has daylight and more than 300 days of a year on average are sunny.

Caddie, the owner of www.sunnyhainan.com has been living in Sanya since 1993. Based on her past experience. there are 3 seasons in Sanya: Hot & Some rains (July-September), Warm & Dry (October till March) and Hot & Humidity (April-June).

Climate & Temperature of Sanya in July, August, and September

It is not too hot from July till September; the highest temperature is around 34 °C. While at the same time the temperatures in Beijing, Shanghai, Guangzhou could be over 38 °C. So basically speaking, Sanya is actually cooler than those big cities. With the help of tropical showers or typhoon, day temperature could easily drop down to 26°C-28 °C. The typhoon could be a problem but usually won’t last more than 3 days. And normally after the typhoon, it becomes very hot, and the sun is sharp shining.

Warm, Sunny & dry season: October, November, December, January, February, and March

The best time to visit Sanya during a whole year is October, November, December, January, February, and March when it is sunny, dry and warm with an average temperature less than 25 °C. Sometimes in December and January, the temperature during the day could be less than 25 °C which is perfect for beach bathing.

April-June is Hot and humidity

It could be difficult for some tourists who are not used to tropical climate as they might keep sweating. But it is a good time to get tanned on a nice beach in Sanya. The sea breeze helps a lot so you won’t feel that hot if you are on the beach or in a pool.

Average Temperature of Sanya Hainan

Average Ocean/Sea Water Temperature of Sanya Hainan

Climate & Weather in Haikou Haikou, The Capital City of Hainan Island:

Haikou, the provincial capital enjoys a sub-tropical climate with an average annual temperature of 20°C (68°F).

Spring in Haikou April till June is hot with humidity, similar temperature as Sanya in the south, and the high summer temperatures bring heavy rains; Summer (July-September) is a season of typhoons and rainstorms. Wintertime in Haikou is normally very nice warm and dry. Sometimes, in December till February, the weather could change a little bit if it rains, the lowest temperature could drop to 15 °C which means very cold for the locals.

Haikou’s casual attitude makes packing a breeze. From March till November, shorts, T-shirts are usually all that is needed. For December and February especially during the evening, you might need long pants and a coat.

Sun lotions, sandals, sunglasses are the must for a holiday in Haikou. Umbrella is not requested as you could get from the hotels/resorts you stay in.

Average Temperature of Haikou Haikou Hainan: Tropical Climate in the South