Monthly Climate
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Best time to visit Haikou

December is the best time to visit Haikou for general sightseeing, with average highs of 21 °C and about 6 wet days. The comfortable season runs roughly November to March. The sea stays above 20 °C from March to December.

It depends what you are going for

One month rarely wins on everything. These are the best months on each measure taken on its own.

If you want Best month On that measure
Sightseeing and walking December comfort 87/100
A beach holiday November sea 25 °C
The least cloud October 51 % average cloud cover
The least rain January 31 mm
Warmth July 31 °C
Cooler weather January 21 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days Beach
1 December 87 21 °C 6 74
2 January 87 21 °C 6 62
3 February 86 22 °C 7 65
4 March 78 26 °C 7 78
5 November 78 25 °C 8 87
6 April 61 29 °C 12 79
7 October 61 27 °C 13 78
8 May 46 30 °C 18 71
9 September 45 29 °C 20 71
10 July 42 31 °C 17 64
11 June 41 31 °C 18 65
12 August 41 31 °C 21 67

For a beach holiday

November scores highest, with a sea temperature of 25 °C and air temperatures around 25 °C. The sea is above 20 °C from March to December.

Month Sea Air Sunshine Beach score
January 20 °C 21 °C 64 % 62
February 19 °C 22 °C 62 % 65
March 21 °C 26 °C 57 % 78
April 23 °C 29 °C 54 % 79
May 26 °C 30 °C 68 % 71
June 28 °C 31 °C 81 % 65
July 29 °C 31 °C 74 % 64
August 28 °C 31 °C 74 % 67
September 28 °C 29 °C 66 % 71
October 27 °C 27 °C 51 % 78
November 25 °C 25 °C 53 % 87
December 22 °C 21 °C 61 % 74

When to think twice

August scores lowest with about 21 wet days and highs near 31 °C. That does not make it a bad month — it depends entirely on what you are travelling for. The numbers are all here; the judgement is yours.

The full year

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 %

Data sources and method

Normal period
1991–2020
Dataset version
era5-1991-2020-scores1.1
Last processed

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: comfort score, beach score, season boundaries. 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.