Warm
Average highs sit around 31°C, giving warm days by monthly-average standards.
September verdict
Haikou, Hainan, China in September
Weather score52Mixed
Mixed for holiday weather
Average highs sit around 31°C, giving warm days by monthly-average standards. Sunshine averages 6.6h per day, enough for a balanced month. Rainfall averages 299mm, so showers are a real planning factor.
September weather
Monthly averages
Temp
31°C
Rain
299mm
Sun
6.6h
Sea
28°C
Weather score
52
Mixed
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Wet
Rainfall averages 299mm, so showers are a real planning factor.
Some sun
Sunshine averages 6.6h per day, enough for a balanced month.
Warm sea
Sea temperatures average 28°C, so swimming is usually comfortable by monthly-average standards.
Map
Weather map
Compare Haikou, Hainan, China with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
September31°C average high
September sits in the warmer part of the year, so midday sightseeing can feel heavier than in cooler months.
Warmest monthsMay to September
This stretch sets the upper range for average daytime heat.
Rain
September299mm average rain
September is one of Haikou's wettest months, so rain is likely to be a major planning factor.
Driest monthsJanuary to April and November to December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
September6.6 hours average sun
September is brighter than Haikou's yearly average, though the strongest sunshine usually sits closer to the peak months.
Brightest monthsMay to August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
September28°C average sea
September is one of Haikou's warmest sea months, when swimming comfort is usually strongest.
Warmest seaMay to October
Sea temperatures are usually near 26°C in this stretch, so swimming comfort is at its strongest.
Weather score
September52 weather score
September scores below Haikou's yearly average, so the weather trade-offs are more noticeable.
Best weather monthsMarch to April and October to November
These months have the strongest weather score in the monthly averages.
