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Climate - Hainan (China)


Average weather, temperature, rainfall, sunshine hours

Flag - China

Hainan, where it's located


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On the island of Hainan, the southernmost province of China, the climate is almost tropical, with very mild winters and long, hot, muggy, and rainy summers. In fact, the average January temperature is slightly lower than 20 °C (68 °F) in the north, and slightly higher in the south. Rainfall is abundant from May to November on the eastern side, while the western side is more sheltered, and receives moderate rains only from June to October, and abundant in August and September. Therefore, on the western side, the total annual rainfall barely reaches 1,000 mm (40 in), not much for a tropical area, while on the eastern side of the island, it rains about twice as much.

On the northern coast, where the capital, Haikou, is located, the average January temperature is 18.5 °C (65 °F). In winter, the north-east monsoon brings cloudy days, during which there are some drizzles, or fog can form. Sometimes, cold and windy days can occur, with highs around 13 °C (55 °F) or even below. In January 2016, the temperature dropped to 6 °C (43 °F), with a maximum of 8 °C (46.5 °F). Here are the average temperatures.
Haikou - Average temperatures (1991-2020)
MonthMin (°C)Max (°C)Mean (°C)Min (°F)Max (°F)Mean (°F)
January162118.4607065.2
February172319.8627367.6
March202623677973.3
April233026.3738679.4
May253228.5779083.2
June263329.5789285.2
July263329.4789285
August263228.9789084.1
September253127.9778782.2
October232926.1748478.9
November212623.2697973.8
December172219.8637267.6
Year21.928.325.0571.582.977

In Haikou, rainfall amounts to 1,600 millimeters (63 inches) per year and is abundant from May to October.
Haikou - Average precipitation
MonthMillimetersInchesDays
January200.89
February351.411
March50210
April1054.112
May1857.316
June2108.316
July2108.314
August2258.915
September2509.815
October2007.913
November953.710
December351.48
Year162564149

In Haikou, the sun shines about 2,000 hours per year: in winter, the sky is often cloudy, while from May to September, the sun shines a little more often than in the southern part of the Chinese mainland.
Haikou - Sunshine hours
MonthAverageTotal
January3.5110
February3.5100
March4.5135
April5.5170
May7220
June7.5225
July8250
August7220
September6.5195
October5.5175
November5145
December4130
Year5.72070

The sea temperature on the north coast of Hainan is similar to that of Guangdong, although it is a bit warmer in winter. However, it is a bit cool for swimming from January to March, while it is pleasantly warm from May to October.
Haikou - Sea temperature
MonthCelsius (°C)Fahrenheit (°F)
January2170
February2170
March2272
April2475
May2781
June2984
July2984
August2984
September2984
October2882
November2577
December2373
Year25.678.1

Yalong Bay, Sanya

On the southern coast, where the tourist resorts are found, the winter temperature becomes milder, and the climate can be defined as tropical, in fact, the January average is 22 °C (72 °F). However, from November to March, the night temperature can sometimes drop to around 10 °C (50 °F). Here are the average temperatures of Sanya, the largest city of the southern coast.
Sanya - Average temperatures
MonthMin (°C)Max (°C)Mean (°C)Min (°F)Max (°F)Mean (°F)
January182622.3657972.1
February202723.3688073.9
March222925.2718377.4
April243127.4768781.4
May263228.8789083.8
June263229798984.2
July263228.8798983.8
August263128.4788983.2
September253128768882.3
October233026.8748680.2
November212824.9708376.8
December192722.8668073
Year2329.726.2573.485.479.5

In Sanya, rainfall amounts to 1,400 mm (55 in) a year; the trend is very similar to that of the north coast, but the period November-April is drier because this coast is sheltered from the north winds.
Sanya - Average precipitation
MonthMillimetersInchesDays
January100.43
February150.64
March200.84
April451.86
May1405.510
June2007.914
July1957.714
August2208.716
September2509.817
October2349.214
November602.47
December100.44
Year139054.7111

In winter, the sun shines more often on the southern coast than on the northern one.
Sanya - Sunshine hours
MonthAverageTotal
January5.5170
February5145
March5.5175
April6185
May7.5225
June6.5200
July7.5225
August6.5200
September6.5200
October6.5200
November6185
December6185
Year6.32295

On the southern coast, the sea is also warmer in winter, in fact, the water temperature does not drop below 23 °C (73 °F) in January and February: after all, you can swim even in winter.
Sanya - Sea temperature
MonthCelsius (°C)Fahrenheit (°F)
January2374
February2373
March23.575
April25.578
May28.583
June29.585
July29.585
August29.585
September2984
October27.582
November26.579
December24.576
Year26.680

On this island, the interior is occupied by hills and mountains, where lush forests grow. The highest mountain is Wuzhishan (the "five finger mountain"), 1,840 meters (6,040 feet) high. On the top, the daytime temperature is around 10 °C (50 °F) from December to February, and around 20 °C (68 °F) from May to September. However, access has recently been closed to foreign tourists.

Typhoons


Together with Southern China, Hainan can be hit by typhoons, the tropical cyclones of Southeast Asia. Typically, typhoons occur in this area from June to mid-November, but sometimes (though very rarely) they have affected this area outside of this period, i.e. in April or in May.

Best Time


If you want to go on excursions on the island of Hainan, you can choose the coolest period, from mid-November to late March.
For a beach holiday, you can choose the month of April (or even May, which, however, is warmer and rainier). The May-September period is hot and muggy, with showers and thunderstorms that can even be strong, but also with some hours of sunshine. From June to mid-November, typhoons can occur, which bring strong winds and torrential rains.
On the southern coast (see Sanya), there can be days that are warm enough for sunbathing and swimming even in winter. On cool and cloudy days, you can go on excursions on the island.


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