The highest day temperature in September 2017 was 99°F. The lowest night temperature was -5°F. The average values for day and night temperatures during September were 89.0°F и 85.0°F respectivly.

The average sea surface temperature in September 2017 for Koror was 90.8°F. The maximum and minimum values were 90.2°F and 91.8°F respectively.

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

Precipitation total in September for Koror is 10.1 in. It makes september one of the most rainy months of the year.

The average wind speed in September is 11.8 mph.

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 Koror in September is 6.7 hours.