Climate - Haikou (China)

Haikou's climate is subtropical, with very mild or pleasantly warm winters and hot, humid and rainy summers. The rains are abundant from May to October.
The city is the capital of the province of Hainan and is located in the far south of China, at 20 degrees north latitude, on the north coast of the island of Hainan.
Winter, from December to February, is very mild, however, 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).
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.

The average temperature of the coldest month (January) is of 18.4 °C (65.2 °F), that of the warmest month (June) is of 29.5 °C (85.2 °F). Here are the average temperatures.
Precipitation amounts to 1625 millimeters (64 inches) per year: it is therefore abundant. It ranges from 20 mm (0.8 in) in the driest month (January) to 250 mm (9.8 in) in the wettest one (September). Here is the average precipitation.
The sea temperature ranges from 21 °C (70 °F) in January, February to 29 °C (84 °F) in June, July, August, September. Here are the average sea temperatures.
On average, there are around 2070 sunshine hours per year. Here are the average sunshine hours per day.

Haikou - Weather by month

Based on the period 1991-2020
(January - February - March - April - May - June - July - August - September - October - November - December)

---

In January, the coldest month of the year, the average temperature in Haikou is of 18.4 °C (65 °F), with a minimum of 15.6 °C (60.2 °F) and a maximum of 21.2 °C (70.1 °F).
On the coldest nights of the month, the temperature usually drops to around 10 °C (50 °F). However, in January 2016, it dropped to 5.9 °C (42.6 °F).
On the warmest days of the month, the temperature usually reaches around 28 °C (82 °F). However, in January 2006, it reached 32.1 °C (89.8 °F).
Precipitation amounts to 20 mm (0.8 in), distributed over 9 days.
On average, there are 110 hours of sunshine per month, i.e. 3.5 hours per day.
The average humidity is 84%.
The average wind speed is 10 kph (6 kph).
The average sea temperature is of 21 °C (70 °F).

---

In February, the average temperature in Haikou is of 19.8 °C (68 °F), with a minimum of 16.8 °C (62.3 °F) and a maximum of 22.7 °C (72.9 °F).
On the coldest nights of the month, the temperature usually drops to around 11 °C (51.5 °F). However, in February 2018, it dropped to 7 °C (44.6 °F).
On the warmest days of the month, the temperature usually reaches around 31 °C (87.5 °F). However, in February 1994, it reached 36.6 °C (97.9 °F).
Precipitation amounts to 35 mm (1.4 in), distributed over 11 days.
On average, there are 100 hours of sunshine per month, i.e. 3.5 hours per day.
The average humidity is 85%.
The average wind speed is 10 kph (6 kph).
The average sea temperature is of 21 °C (70 °F).

---

In March, the average temperature in Haikou is of 23.0 °C (73 °F), with a minimum of 19.6 °C (67.3 °F) and a maximum of 26.4 °C (79.4 °F).
On the coldest nights of the month, the temperature usually drops to around 14 °C (57 °F). However, in March 2005, it dropped to 9.9 °C (49.8 °F).
On the warmest days of the month, the temperature usually reaches around 34.5 °C (94 °F). However, in March 1999, it reached 38.1 °C (100.6 °F).
Precipitation amounts to 50 mm (2 in), distributed over 10 days.
On average, there are 135 hours of sunshine per month, i.e. 4.5 hours per day.
The average humidity is 82%.
The average wind speed is 11 kph (7 kph).
The average sea temperature is of 22 °C (71.5 °F).

---

In April, the average temperature in Haikou is of 26.3 °C (79 °F), with a minimum of 22.8 °C (73 °F) and a maximum of 29.9 °C (85.8 °F).
On the coldest nights of the month, the temperature usually drops to around 18 °C (64.5 °F). However, in April 1996, it dropped to 14.5 °C (58.1 °F).
On the warmest days of the month, the temperature usually reaches around 36.5 °C (97.5 °F). However, in April 2001, it reached 39.6 °C (103.3 °F).
Precipitation amounts to 105 mm (4.1 in), distributed over 12 days.
On average, there are 170 hours of sunshine per month, i.e. 5.5 hours per day.
The average humidity is 80%.
The average wind speed is 11 kph (7 kph).
The average sea temperature is of 24 °C (75 °F).

---

In May, the average temperature in Haikou is of 28.5 °C (83 °F), with a minimum of 24.8 °C (76.6 °F) and a maximum of 32.1 °C (89.9 °F).
On the coldest nights of the month, the temperature usually drops to around 21.5 °C (71 °F). However, in May 2008, it dropped to 20 °C (68 °F).
On the warmest days of the month, the temperature usually reaches around 36.5 °C (98 °F). However, in May 2005, it reached 38.8 °C (101.8 °F).
Precipitation amounts to 185 mm (7.3 in), distributed over 16 days.
On average, there are 220 hours of sunshine per month, i.e. 7 hours per day.
The average humidity is 80%.
The average wind speed is 9 kph (6 kph).
The average sea temperature is of 27 °C (80.5 °F).

---

In June, the warmest month of the year, the average temperature in Haikou is of 29.5 °C (85 °F), with a minimum of 25.7 °C (78.3 °F) and a maximum of 33.3 °C (92 °F).
On the coldest nights of the month, the temperature usually drops to around 23.5 °C (74 °F). However, in June 2002, it dropped to 20.2 °C (68.4 °F).
On the warmest days of the month, the temperature usually reaches around 36.5 °C (97.5 °F). However, in June 2003, it reached 37.7 °C (99.9 °F).
Precipitation amounts to 210 mm (8.3 in), distributed over 16 days.
On average, there are 225 hours of sunshine per month, i.e. 7.5 hours per day.
The average humidity is 79%.
The average wind speed is 9 kph (5 kph).
The average sea temperature is of 29 °C (84 °F).

---

In July, the average temperature in Haikou is of 29.4 °C (85 °F), with a minimum of 25.8 °C (78.4 °F) and a maximum of 33.1 °C (91.6 °F).
On the coldest nights of the month, the temperature usually drops to around 23.5 °C (74.5 °F). However, in July 2004, it dropped to 22 °C (71.6 °F).
On the warmest days of the month, the temperature usually reaches around 36 °C (97 °F). However, in July 1998, it reached 37.7 °C (99.9 °F).
Precipitation amounts to 210 mm (8.3 in), distributed over 14 days.
On average, there are 250 hours of sunshine per month, i.e. 8 hours per day.
The average humidity is 79%.
The average wind speed is 9 kph (6 kph).
The average sea temperature is of 29 °C (84 °F).

---

In August, the average temperature in Haikou is of 28.9 °C (84 °F), with a minimum of 25.6 °C (78 °F) and a maximum of 32.3 °C (90.1 °F).
On the coldest nights of the month, the temperature usually drops to around 23.5 °C (74.5 °F). However, in August 2014, it dropped to 22.3 °C (72.1 °F).
On the warmest days of the month, the temperature usually reaches around 35 °C (95 °F). However, in August 1994, it reached 37 °C (98.6 °F).
Precipitation amounts to 225 mm (8.9 in), distributed over 15 days.
On average, there are 220 hours of sunshine per month, i.e. 7 hours per day.
The average humidity is 81%.
The average wind speed is 8 kph (5 kph).
The average sea temperature is of 29 °C (84 °F).

---

In September, the average temperature in Haikou is of 27.9 °C (82 °F), with a minimum of 24.9 °C (76.9 °F) and a maximum of 30.8 °C (87.5 °F).
On the coldest nights of the month, the temperature usually drops to around 23 °C (73 °F). However, in September 1997, it dropped to 19.7 °C (67.5 °F).
On the warmest days of the month, the temperature usually reaches around 33.5 °C (92.5 °F). However, in September 2006, it reached 35.7 °C (96.3 °F).
Precipitation amounts to 250 mm (9.8 in), distributed over 15 days.
On average, there are 195 hours of sunshine per month, i.e. 6.5 hours per day.
The average humidity is 81%.
The average wind speed is 9 kph (5 kph).
The average sea temperature is of 29 °C (84 °F).

---

In October, the average temperature in Haikou is of 26.1 °C (79 °F), with a minimum of 23.4 °C (74.1 °F) and a maximum of 28.8 °C (83.8 °F).
On the coldest nights of the month, the temperature usually drops to around 20 °C (68.5 °F). However, in October 1991, it dropped to 15.5 °C (59.9 °F).
On the warmest days of the month, the temperature usually reaches around 32 °C (89.5 °F). However, in October 2003, it reached 34.5 °C (94.1 °F).
Precipitation amounts to 200 mm (7.9 in), distributed over 13 days.
On average, there are 175 hours of sunshine per month, i.e. 5.5 hours per day.
The average humidity is 78%.
The average wind speed is 10 kph (6 kph).
The average sea temperature is of 28 °C (82.5 °F).

---

In November, the average temperature in Haikou is of 23.2 °C (74 °F), with a minimum of 20.6 °C (69.1 °F) and a maximum of 25.8 °C (78.5 °F).
On the coldest nights of the month, the temperature usually drops to around 16 °C (61 °F). However, in November 2009, it dropped to 11.4 °C (52.5 °F).
On the warmest days of the month, the temperature usually reaches around 30 °C (86.5 °F). However, in November 1997, it reached 34.7 °C (94.5 °F).
Precipitation amounts to 95 mm (3.7 in), distributed over 10 days.
On average, there are 145 hours of sunshine per month, i.e. 5 hours per day.
The average humidity is 78%.
The average wind speed is 10 kph (6 kph).
The average sea temperature is of 25 °C (77 °F).

---

In December, the average temperature in Haikou is of 19.8 °C (68 °F), with a minimum of 17.3 °C (63.1 °F) and a maximum of 22.2 °C (72.1 °F).
On the coldest nights of the month, the temperature usually drops to around 11.5 °C (52.5 °F). However, in December 1991, it dropped to 7.4 °C (45.3 °F).
On the warmest days of the month, the temperature usually reaches around 27.5 °C (82 °F). However, in December 2012, it reached 31.2 °C (88.2 °F).
Precipitation amounts to 35 mm (1.4 in), distributed over 8 days.
On average, there are 130 hours of sunshine per month, i.e. 4 hours per day.
The average humidity is 79%.
The average wind speed is 10 kph (6 kph).
The average sea temperature is of 23 °C (73.5 °F).