Myrtle Beach weather in September 2025

Q: How hot is it in Myrtle Beach in September?

Daytime temperatures usually reach 29°C in Myrtle Beach in September with moderate heat and humidity, falling to 18°C at night.

Q: How sunny is it in Myrtle Beach in September?

There are normally 8 hours of bright sunshine each day in Myrtle Beach in September - that's 61% of daylight hours.

Q: How warm is the sea around Myrtle Beach in September?

The average sea temperature around Myrtle Beach in September is 26°C.

Q: Does it rain in Myrtle Beach in September?

There are usually 9 days with some rain in Myrtle Beach in September and the average monthly rainfall is 139mm.

Q: What is the chance of a cyclone in Myrtle Beach in September?

On average 1.3 days in September in Myrtle Beach are likely to be affected by the passage of one or more tropical storms.

Expect 29°C daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Myrtle Beach in September. Check more long-term weather averages for Myrtle Beach in September before you book your next holiday to South Carolina in 2025/2026.

29
29°C max day temperature
8
8 hours of sunshine per day
9
9 days with some rainfall
18
18°C min night temperature
12
12 hours of daylight per day
M
Moderate heat & humidity
139
139 mm of monthly rainfall
8
8 (Very High) UV index
26
26°C sea temperature

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The September weather guide for South Carolina (Myrtle Beach) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm) | Imperial (°F / inches)

More about the USA

How hot is it in Myrtle Beach in September?

Daytime temperatures usually reach 29°C in Myrtle Beach in September with moderate heat and humidity, falling to 18°C at night.

How sunny is it in Myrtle Beach in September?

There are normally 8 hours of bright sunshine each day in Myrtle Beach in September - that's 61% of daylight hours.

How warm is the sea around Myrtle Beach in September?

The average sea temperature around Myrtle Beach in September is 26°C.

Does it rain in Myrtle Beach in September?

There are usually 9 days with some rain in Myrtle Beach in September and the average monthly rainfall is 139mm.

What is the chance of a hurricane in Myrtle Beach in September?

On average 1.3 days in September in Myrtle Beach are likely to be affected by the passage of one or more tropical storms.

Myrtle Beach September sunrise & sunset times

Browse the sunrise and sunset times for Myrtle Beach in September 2025. Select a month to view Myrtle Beach sunrise and sunset times for the next 12 months.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Date	Sunrise times	Sunset times
Monday, 1st September 2025	05:50	18:41
Monday, 15th September 2025	05:59	18:21
Tuesday, 30th September 2025	06:09	18:01

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South Carolina - quick facts
Flight time^✝	11.5 hours
Time difference	UK -5 hours
Language(s)	English
Currency	US Dollar
Electricity	A + B plug (120V)
Driving side	Right
Visa^✝	Yes
Why visit?	Beaches Culture
Tourist info	South Carolina Department of Parks, Recreation & Tourism