Haikou climate

Name: Haikou
Address: CN

Haikou is warmest in July, with average highs of 31 °C, and coldest in January, when nights average 17 °C. August is the wettest month (239 mm) and January the driest (31 mm). Figures are 1991–2020 climate normals.

Across a full year Haikou averages 1,353 mm of rain and 250 days above 25 °C.

China · population 2,873,358 · 1991–2020 normals

Temperature below 0 °C to above 30 °C Rain band height is that month’s share of the wettest month

Warmest month July 31 °C
Coldest month January 17 °C
Driest month January 31 mm
Wettest month August 239 mm
Least cloud October 51 % cloud
Hottest on record May 39 °C
Coldest on record January 8.8 °C
Warmest sea July 29 °C

What to expectHaikou through the year

Haikou has a clear annual cycle: average daily highs run from 21 °C in January to 31 °C in July, a swing of 10.0 °C in mean temperature across the year.

Counted across a normal year, 250 days a year reach 25 °C, 111 of them reach 30 °C. The warmest reading in the 1991–2020 record is 39 °C, in May.

Rain is strongly seasonal. August averages 239 mm against 31 mm in January — 7.8 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off Haikou is warmest in July at 29 °C and coldest in February at 19 °C. Sea temperature lags the air by a month or two, which is why late summer swims warmer than early summer at the same air temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	20.7 °C	31 mm	64 %
February	22.3 °C	33 mm	62 %
March	25.6 °C	37 mm	57 %
April	28.5 °C	72 mm	54 %
May	30.4 °C	132 mm	68 %
June	31.4 °C	167 mm	81 %
July	31.4 °C	176 mm	74 %
August	30.6 °C	239 mm	74 %
September	29.3 °C	224 mm	66 %
October	27.3 °C	160 mm	51 %
November	24.9 °C	46 mm	53 %
December	21.5 °C	37 mm	61 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C
January	20.7 °C	16.9 °C	18.7 °C	29.2 °C	8.8 °C	2	0
February	22.3 °C	18.0 °C	19.9 °C	31.9 °C	10.1 °C	6	1
March	25.6 °C	20.5 °C	22.7 °C	34.5 °C	11.9 °C	17	4
April	28.5 °C	23.3 °C	25.5 °C	36.8 °C	16.8 °C	25	10
May	30.4 °C	25.5 °C	27.5 °C	38.6 °C	19.7 °C	31	17
June	31.4 °C	26.7 °C	28.6 °C	36.8 °C	23.2 °C	30	24
July	31.4 °C	26.7 °C	28.7 °C	38.6 °C	23.8 °C	31	24
August	30.6 °C	26.3 °C	28.1 °C	34.2 °C	24.1 °C	31	20
September	29.3 °C	25.4 °C	27.2 °C	33.1 °C	20.9 °C	30	10
October	27.3 °C	23.9 °C	25.5 °C	31.9 °C	17.5 °C	29	1
November	24.9 °C	21.7 °C	23.2 °C	30.5 °C	13.5 °C	15	0
December	21.5 °C	18.4 °C	19.9 °C	28.6 °C	8.9 °C	3	0

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	31 mm	6	11 h/day	64 %	81 %	23 km/h	19.8 °C
February	33 mm	7	11 h/day	62 %	83 %	23 km/h	19.3 °C
March	37 mm	7	12 h/day	57 %	82 %	23 km/h	20.5 °C
April	72 mm	12	13 h/day	54 %	82 %	21 km/h	22.9 °C
May	132 mm	18	13 h/day	68 %	83 %	18 km/h	26.2 °C
June	167 mm	18	13 h/day	81 %	82 %	18 km/h	27.9 °C
July	176 mm	17	13 h/day	74 %	81 %	20 km/h	28.5 °C
August	239 mm	21	13 h/day	74 %	84 %	18 km/h	28.4 °C
September	224 mm	20	12 h/day	66 %	84 %	20 km/h	28.1 °C
October	160 mm	13	12 h/day	51 %	79 %	24 km/h	27.2 °C
November	46 mm	8	11 h/day	53 %	78 %	25 km/h	25.0 °C
December	37 mm	6	11 h/day	61 %	77 %	25 km/h	22.1 °C

How Haikou compares

The same four figures for nearby destinations, so the numbers above have something to be read against. Summer high is the warmest month's average high; winter low is the coldest month's average low.

Destination	Summer high	Winter low	Rain per year	Days above 25 °C
Haikou	31 °C	17 °C	1,353 mm	250
Wenchang · China	31 °C	17 °C	1,472 mm	275
Qionghai · China	31 °C	17 °C	1,469 mm	268
Nada · China	32 °C	15 °C	1,390 mm	287
Zhanjiang · China	31 °C	13 °C	1,478 mm	255
Wanning · China	30 °C	18 °C	1,603 mm	258
Maoming · China	31 °C	13 °C	1,946 mm	267

Planning a trip? See the best time to visit Haikou.

QuestionsCommon questions about Haikou’s climate

When is the best time to visit Haikou?

That depends on what you want, so the honest answer is a comparison rather than a single month. January, February, December sit closest to 20 °C on average, July is the warmest month and January the driest. The month-by-month table above has the full picture.

How hot does Haikou get?

In July, the warmest month, daily highs average 31 °C. About 111 days a year pass 30 °C. The highest value in the 1991–2020 record is 39 °C.

How cold does it get in winter?

Nights average 17 °C in January, the coldest month. Freezing nights are not part of a normal year here.

Which month is wettest in Haikou?

August, averaging 239 mm over 21 days with rain. The driest month is January with 31 mm. The year as a whole averages 1,353 mm.

Are these figures a forecast?

No. They are 1991–2020 climate normals: the average of thirty years, which describes what a month is usually like in Haikou rather than what any particular week will bring. Individual years can differ substantially from the normal.

Data sources and method

ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
Open-Meteo — Open-Meteo.com. CC BY 4.0
NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
GeoNames — GeoNames.org. CC BY 4.0

Normal period: 1991–2020
Data point: 20.034°, 110.347° (the coordinates the reanalysis values are taken for)
Dataset version: era5-1991-2020-scores1.1
Last processed: 1 August 2026

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: monthly rankings, daylight hours, beach and comfort scores. Full formulas are on the methodology page.

Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.