Myrtle Beach Weather in September

What's the weather like in Myrtle Beach (South Carolina) in September 2025?

The climate in Myrtle Beach during September can be summarized as hot, humid and wet.

September is in the fall / autumn in Myrtle Beach and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a muggy 29°C (85°F), whilst at night 18°C (65°F) is normal.

Myrtle Beach weather averages (imperial / metric)
Daytime temperature 29.2°C 84.6°F
Nightly temperature 18.2°C 64.8°F
Average temperature 23.7°C 74.7°F
Daily sunshine 8.1 hrs
Avg rainfall 139 mm 5.5 ins
Rainy days 9 days
Sea temperature 27.5°C 81.6°F
Humidity 79%
Windspeed 13kph 8 mph

On average September is the 3rd wettest month of the year in Myrtle Beach with around 139mm 5.5 inches of rain making it a wet time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.

On the flip side this corresponds to an average of 8.1 hours of sunshine per day.

September temperatures in Myrtle Beach

Myrtle Beach average temperature in September

September rainfall

Myrtle Beach average rain in September

September hourly sunshine

Myrtle Beach average rain in September

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Myrtle Beach in September 2025.

Other monthly averages

Best places to visit in September

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Myrtle Beach weather stats

Myrtle Beach weather statistics
Hottest month: July 32°C 89.6°F
Driest month: November 70mm 2.8ins
Sunniest month: April 9.7hrs
Coldest month: January 13.1°C 55.6°F
Wettest month: July 171mm 6.7ins
Map showing location of Myrtle Beach (33.68906, -78.88669) Myrtle Beach map pin © Google

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