Haikou, China climate

Aw Tropical savanna (dry winter)

Haikou has a mildly seasonal tropical climate (Tropical savanna (dry winter), Köppen Aw). The hottest month is July with an average daily high near 33°C, while the coldest is January averaging around 16°C at night. Precipitation totals about 1813 mm a year and is strongly seasonal — August alone averages 289 mm while January barely receives 25 mm.

☀️ All year

Hot

Daytime highs near 33°C most of the year.

About 90 days a year above 32 °C

🌙 Nights

Stays warm

Even the coolest nights stay near 16°C.

🌧️ Rain

Very wet

About 1813 mm of rain a year.

Wettest in August

⛅ Sky & trend

Often cloudy

Cloudy skies much of the year.

+0.5 °C vs 50 years ago

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figures

Clear vs cloudy days

Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day counts

Haikou climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	21	23	26	30	32	33	33	32	31	29	26	22
Avg temp (°C)	19	20	23	27	29	30	30	29	28	26	23	20
Avg low (°C)	16	17	20	23	25	26	26	26	25	24	21	18
Precipitation (mm)	25	34	49	77	190	245	241	289	284	287	55	39

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	21	23	26	30	32	33
Avg temp (°C)	19	20	23	27	29	30
Avg low (°C)	16	17	20	23	25	26
Precipitation (mm)	25	34	49	77	190	245

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	33	32	31	29	26	22
Avg temp (°C)	30	29	28	26	23	20
Avg low (°C)	26	26	25	24	21	18
Precipitation (mm)	241	289	284	287	55	39

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	7	8	8	8	13	14	14	13	12	9	7	7
Days with high ≥ 32°C (days)	0.1	0.7	4	9	14	18	19	16	8	0.9	0.5	—

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	7	8	8	8	13	14
Days with high ≥ 32°C (days)	0.1	0.7	4	9	14	18

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	14	13	12	9	7	7
Days with high ≥ 32°C (days)	19	16	8	0.9	0.5	—

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	70	71	69	65	66	73	68	68	64	55	59	65
Clear days (≤ 30% cloud)	4	3	4	5	5	4	5	5	5	8	7	5
Partly cloudy days (30–70%)	9	9	10	11	10	7	9	9	11	12	11	10
Cloudy days (≥ 70%)	18	17	18	15	16	19	18	17	14	11	12	16
Relative humidity (%)	81	81	79	78	81	85	85	86	85	82	81	80
Wind speed (mph)	8.9	8.2	7.6	6.7	6.2	6.7	7.3	6.8	7.4	9.3	9.8	10.1

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	70	71	69	65	66	73
Clear days (≤ 30% cloud)	4	3	4	5	5	4
Partly cloudy days (30–70%)	9	9	10	11	10	7
Cloudy days (≥ 70%)	18	17	18	15	16	19
Relative humidity (%)	81	81	79	78	81	85
Wind speed (mph)	8.9	8.2	7.6	6.7	6.2	6.7

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	68	68	64	55	59	65
Clear days (≤ 30% cloud)	5	5	5	8	7	5
Partly cloudy days (30–70%)	9	9	11	12	11	10
Cloudy days (≥ 70%)	18	17	14	11	12	16
Relative humidity (%)	85	86	85	82	81	80
Wind speed (mph)	7.3	6.8	7.4	9.3	9.8	10.1

Methodology & sources

Temperature & precipitation — 1991–2020 normals computed from 23 years of daily observations at Haikou, a weather station, about 11 km from the city centre. The underlying daily records come from NOAA's global station network.

Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.

How we build these numbers →