Hilton Head Island weather in August 2025

Q: How hot is it in Hilton Head Island in August?

Daytime temperatures usually reach 31°C in Hilton Head Island in August with very high heat and humidity, falling to 23°C at night.

Q: How sunny is it in Hilton Head Island in August?

There are normally 8 hours of bright sunshine each day in Hilton Head Island in August - that's 61% of daylight hours.

Q: How warm is the sea around Hilton Head Island in August?

The average sea temperature around Hilton Head Island in August is 28°C.

Q: Does it rain in Hilton Head Island in August?

There are usually 13 days with some rain in Hilton Head Island in August and the average monthly rainfall is 193mm.

Q: What is the chance of a cyclone in Hilton Head Island in August?

On average 1 day in August in Hilton Head Island is likely to be affected by the passage of one or more tropical storms.

Expect 31°C daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Hilton Head Island in August. Check more long-term weather averages for Hilton Head Island in August before you book your next holiday to South Carolina in 2025/2026.

31
31°C max day temperature
8
8 hours of sunshine per day
13
13 days with some rainfall
23
23°C min night temperature
13
13 hours of daylight per day
VH
Very High heat & humidity
193
193 mm of monthly rainfall
10
10 (Very High) UV index
28
28°C sea temperature

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The August weather guide for South Carolina (Hilton Head Island) 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 Hilton Head Island in August?

Daytime temperatures usually reach 31°C in Hilton Head Island in August with very high heat and humidity, falling to 23°C at night.

How sunny is it in Hilton Head Island in August?

There are normally 8 hours of bright sunshine each day in Hilton Head Island in August - that's 61% of daylight hours.

How warm is the sea around Hilton Head Island in August?

The average sea temperature around Hilton Head Island in August is 28°C.

Does it rain in Hilton Head Island in August?

There are usually 13 days with some rain in Hilton Head Island in August and the average monthly rainfall is 193mm.

What is the chance of a hurricane in Hilton Head Island in August?

On average 1 day in August in Hilton Head Island is likely to be affected by the passage of one or more tropical storms.

Hilton Head Island August sunrise & sunset times

Browse the sunrise and sunset times for Hilton Head Island in August 2025. Select a month to view Hilton Head Island 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
Friday, 1st August 2025	05:38	19:20
Saturday, 16th August 2025	05:48	19:06
Sunday, 31st August 2025	05:58	18:48

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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