The highest day temperature in September 2025 was 78°F. The lowest night temperature was 71°F. The average values for day and night temperatures during September were 75.7°F и 73.5°F respectivly.

The average sea surface temperature in September 2025 for Turtle Bay was 77.9°F. The maximum and minimum values were 77.4°F and 78.4°F respectively.

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

Precipitation total in September for Turtle Bay is 0.6 in. It makes september the least rainy month of the year.

The average wind speed in September is 14.1 mph. It makes September one of the most windy months of the year for Turtle Bay.

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 Turtle Bay in September is 7.2 hours.