The highest day temperature in September 2025 was 88°F. The lowest night temperature was 80°F. The average values for day and night temperatures during September were 85.5°F и 83.0°F respectivly.

The average sea surface temperature in September 2025 for Karon Beach was 87.7°F. The maximum and minimum values were 86.6°F and 88.4°F respectively.

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

Precipitation total in September for Karon Beach is 9.3 in. It makes september one of the most rainy months of the year.

The average wind speed in September is 10.8 mph. It makes September one of the most windy months of the year for Karon Beach.

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 Karon Beach in September is 6.0 hours.