The weather in Hainan in September is very hot. The average temperatures are between 24°C and 31°C, drinking water regularly is advisable.
You can expect rain for roughly half of the month of September in Hainan. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Our weather forecast can give you a great sense of what weather to expect in Hainan in September 2025.
If you’re planning to visit Hainan in the near future, we highly recommend that you review the 14 day weather forecast for Hainan before you arrive.
Temperatures
31° / 24°
Rainy Days
14
Snowy Days
0
Dry Days
16
Rainfall
248
mm
Sun Hours
10.3
Hrs
