The highest day temperature in October 2025 was 90°F. The lowest night temperature was 64°F. The average values for day and night temperatures during October were 80.9°F и 72.6°F respectivly.

The average sea surface temperature in October 2025 for Hainan was 86.2°F. The maximum and minimum values were 83.8°F and 88.6°F respectively.

Most of the days in October are gloomy but you can also expect sunny days.

Precipitation total in October for Hainan is 9.1 in. It makes october the most rainy month of the year.

The average wind speed in October is 4.3 mph. This value is relatively stable throughout the year.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Hainan in October is 4.1 hours.