Climate Insights for Haikou

The climate in Haikou is hot. The average annual temperature is 25°C and approximately 1339mm of precipitation falls per year. August is the wettest month, receiving around 246mm of rainfall. Haikou is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: June, July, August. The coldest months are January, February, December, when temperatures can drop to 18°C.

Haikou sees moderate temperature variation throughout the year, ranging from 18°C to 32°C. The warmest month is June, when average highs reach 32°C and the mean temperature sits around 29°C. January is the coolest month, with minimum temperatures around 18°C and an average of 19°C. Daily temperature variation is modest, with an average difference of 3°C between highs and lows. The sharpest temperature change occurs between November and December, with a 4°C shift in average temperatures.

Haikou is a fairly wet location, receiving approximately 1339mm of precipitation annually, which averages out to around 112mm per month. The wettest month is August, averaging 246mm of rainfall. October and September also tend to see above-average precipitation. The driest month is December, with just 20mm. That's 226mm less than August, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic.

Haikou is moderately windy, with an average annual wind speed of 22km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is October, averaging 26km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in August, with average winds dropping to 18km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 8km/h gap between the calmest and windiest months. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 24km/h in winter, 22km/h in spring, 19km/h in summer, 23km/h in autumn.

It is currently spring in Haikou, which began on March 20, 2026. Haikou is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in June at around 32°C, while the coldest stretch bottoms out in January near 18°C. Summer is next, beginning on June 21, 2026 — 90 days from now.

The best time to visit Haikou is during January, February, March, November and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 21°C with modest rainfall averaging 37mm per month. By contrast, June can be uncomfortably hot with temperatures reaching 32°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

The table below shows monthly climate averages for Haikou based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.