Haikou climate
Haikou (Hainan, China) has a tropical monsoon climate (Köppen Am). The average temperature over the year is 25 °C77 °F, and about 1,842 mm73 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Haikou climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin |
|---|---|---|---|---|
| Jan | 2170 | 1762 | 1966 | 331.3 |
| Feb | 2373 | 1763 | 2068 | 281.1 |
| Mar | 2577 | 2067 | 2272 | 481.9 |
| Apr | 2883 | 2373 | 2578 | 883.5 |
| May | 3086 | 2577 | 2882 | 1907.5 |
| Jun | 3087 | 2780 | 2883 | 2058.1 |
| Jul | 3087 | 2680 | 2883 | 2369.3 |
| Aug | 3086 | 2680 | 2883 | 31312 |
| Sep | 2985 | 2679 | 2882 | 29312 |
| Oct | 2882 | 2476 | 2679 | 27811 |
| Nov | 2577 | 2271 | 2474 | 813.2 |
| Dec | 2271 | 1865 | 2068 | 491.9 |
| Year | 3087 | 1762 | 2577 | 1,84273 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 83% | 70% | 2.8 | 11:02 |
| Feb | 85% | 71% | 3.3 | 11:28 |
| Mar | 84% | 68% | 3.9 | 11:59 |
| Apr | 83% | 61% | 4.7 | 12:35 |
| May | 85% | 64% | 5.5 | 13:05 |
| Jun | 87% | 74% | 5.5 | 13:20 |
| Jul | 87% | 68% | 5.6 | 13:14 |
| Aug | 87% | 68% | 5.1 | 12:48 |
| Sep | 85% | 64% | 4.7 | 12:14 |
| Oct | 83% | 54% | 4.2 | 11:39 |
| Nov | 82% | 59% | 3.5 | 11:09 |
| Dec | 80% | 66% | 2.9 | 10:55 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Haikou is like
The warmest month is June, with an average high of 30 °C87 °F and a low of 27 °C80 °F. The coldest is January, when highs average 21 °C70 °F and lows 17 °C62 °F. There is a clear seasonal cycle, with 9.6 °C17.4 °F between the average temperature of the warmest and the coolest month.
It is wet, with about 1,842 mm73 in of precipitation per year. The wettest three-month stretch is August–October, which brings 48% of the annual total. The wettest month is August (313 mm12 in), the driest is February (28 mm1.1 in).
Relative humidity ranges from 80% in December to 87% in August. The clearest skies (lowest average cloud amount, 54%) are typical of October. Average wind speed near the ground ranges from 10 km/h (6 mph) in August to 17 km/h (10 mph) in December. Daylight lasts from about 10.9 hours in December to 13.3 hours in June.
Best time to visit Haikou
Based on these averages, the most comfortable months for sightseeing and outdoor activities are December–March: average highs of 21 °C70 °F to 25 °C77 °F with 28 mm1.1 in to 49 mm1.9 in of precipitation per month.
The most challenging month is August, which is hot, with average highs of 30 °C86 °F, very wet (313 mm12 in) and humid (87% relative humidity).
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
Haikou weather by month
- January21 °C70 °F / 17 °C62 °F
- February23 °C73 °F / 17 °C63 °F
- March25 °C77 °F / 20 °C67 °F
- April28 °C83 °F / 23 °C73 °F
- May30 °C86 °F / 25 °C77 °F
- June30 °C87 °F / 27 °C80 °F
- July30 °C87 °F / 26 °C80 °F
- August30 °C86 °F / 26 °C80 °F
- September29 °C85 °F / 26 °C79 °F
- October28 °C82 °F / 24 °C76 °F
- November25 °C77 °F / 22 °C71 °F
- December22 °C71 °F / 18 °C65 °F
What to pack for Haikou
- Wetter months (May–October) — highs 2882 to 30 °C87 °F, lows 2476 to 27 °C80 °F, about 252 mm9.9 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and a good rain jacket or umbrella and quick-drying shoes.
- Drier months (November–April) — highs 2170 to 28 °C83 °F, lows 1762 to 23 °C73 °F, about 54 mm2.1 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket.
How Haikou compares
Compared with Nanning, about 374 km to the northwest, Haikou is on average 2.5 °C4.5 °F warmer and receives 33% more precipitation (1,842 mm73 in vs 1,388 mm55 in). The difference is largest in December (6.3 °C11.3 °F warmer).
Of the 547 places in China covered by World Climates, Haikou is the 7th warmest by annual mean temperature and the 23rd wettest by annual precipitation. See all of them on the China climate page.
Places in other countries with the most similar temperature and rainfall pattern: Nghi Sơn (Vietnam, Cwa), Thanh Hóa (Vietnam, Cwa) and Nam Định (Vietnam, Cwa).
Nearby places
- Xiuying 7 km · 25 °C77 °F · 1,781 mm70 in
- Wenchang 72 km · 25 °C77 °F · 1,910 mm75 in
- Qionghai 89 km · 25 °C77 °F · 1,843 mm73 in
- Nada 99 km · 24 °C76 °F · 1,915 mm75 in
- Zhanjiang 133 km · 24 °C75 °F · 1,855 mm73 in
- Wanning 137 km · 25 °C78 °F · 1,843 mm73 in
- Wuzhishan 165 km · 24 °C75 °F · 2,012 mm79 in
- Lianjiang 179 km · 23 °C74 °F · 1,754 mm69 in
Frequently asked questions
What is the warmest month in Haikou?
June is the warmest month in Haikou, with an average high of 30 °C (87 °F) and an average low of 27 °C (80 °F).
What is the coldest month in Haikou?
January is the coldest month, with an average high of 21 °C (70 °F) and an average low of 17 °C (62 °F).
When does it rain the most in Haikou?
August is the wettest month with about 313 mm (12.3 in) of precipitation; February is the driest with about 28 mm (1.1 in).
What is the best time to visit Haikou?
Judging by long-term averages, the most comfortable months are December–March.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.