The highest day temperature in September 2026 was 99°F. The lowest night temperature was 57°F. The average values for day and night temperatures during September were 89.3°F и 73.5°F respectivly.

The average sea surface temperature in September 2026 for Myrtle Beach was 85.5°F. The maximum and minimum values were 79.8°F and 88.6°F respectively.

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

Precipitation total in September for Myrtle Beach is 1.4 in. It makes september one of the most rainy months of the year.

The average wind speed in September is 7.4 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 Myrtle Beach in September is 7.5 hours.