Haikou weather in May
In May, Haikou has an average high of 30 °C86 °F and an average low of 25 °C77 °F, with about 190 mm7.5 in of precipitation. It is the 5th warmest month of the year and ranks 6th for precipitation.
How May compares with other months
Compared with April, May is 2.3 °C4.2 °F warmer on average and wetter by 101 mm4.0 in. Compared with June, May is 0.8 °C1.4 °F cooler on average and drier by 15 mm0.6 in. Daylight lasts about 13.1 hours around the middle of the month. Average relative humidity is 85% and the average cloud amount 64%.
Is May a good time to visit Haikou?
May is not among the most comfortable months by our comfort score: it is hot (average high 30 °C86 °F), it is fairly wet (190 mm7.5 in) and it is humid (85%). The most comfortable months in Haikou are December–March.
What to wear in May
For Haikou in May, pack light summer clothes such as T-shirts, shorts or light dresses and an umbrella or light rain jacket.
May in nearby places
Other months in Haikou
- 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
Frequently asked questions
How warm is Haikou in May?
In May the average high in Haikou is 30 °C (86 °F) and the average low is 25 °C (77 °F).
Does it rain a lot in Haikou in May?
On average about 190 mm (7.5 in) of precipitation falls in May; it ranks 6th of the 12 months.
Is May the warmest month in Haikou?
No. The warmest month in Haikou is June, with an average high of 30 °C (87 °F). The coldest month is January, with an average low of 17 °C (62 °F).
How long is the day in Haikou in May?
In the middle of May the day in Haikou lasts about 13.1 hours from sunrise to sunset. The value is calculated from the position of the city and the sun.
How humid is Haikou in May?
The average relative humidity in May is about 85%. Combined with warm days, it can feel muggy.
How cloudy is Haikou in May?
On average about 64% of the sky is covered by cloud in May. This is the mean cloud amount from satellite data, not the number of sunny days.
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.