The highest day temperature in September 2025 was 91°F. The lowest night temperature was 82°F. The average values for day and night temperatures during September were 89.8°F и 84.1°F respectivly.

The average sea surface temperature in September 2025 for Okinawa was 89.9°F. The maximum and minimum values were 89.0°F and 90.4°F respectively.

Most of the days in September are cloudy but you can also expect sunny or gloomy days.

Precipitation total in September for Okinawa is 7.3 in.

The average wind speed in September is 12.2 mph. It makes September one of the most windless months of the year for Okinawa.

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 Okinawa in September is 6.3 hours.