Hilton Head Island Weather in August

August in Hilton Head Island brings very high temperatures around 32°C (90°F) during the day, dropping to 24°C (75°F) at night, with the most rainfall of the year.

Rainfall in Hilton Head Island in August

Prepare for intense rain this month, as it marks the peak rainfall period. Having a poncho will keep you dry through the downpours. Historically, the month has about 16 days of rain, averaging 199 mm (7.8 in) in total. Rain falls regularly this month and can be quite heavy when it does. Showers can be substantial, so waterproof gear is a good idea.

Temperature in Hilton Head Island in August

Daytime temperatures in Hilton Head Island reach 32°C (90°F) in August, dropping to 24°C (75°F) at night. It's usually most comfortable outside during the morning and later in the day. With lows around 24°C (75°F), the nights are warm enough that a sheet is usually all you need for bedding.

Sunshine in Hilton Head Island in August

Enjoy a sunny month with about 251 hours of sunshine, the clear skies make Hilton Head Island even more beautiful.

Average water temperature in August

The water reaches 29°C (84°F) this month. It's on the warm side, which suits people who prefer that, but don't expect a cooling dip if the air temperature is also high.

August in Hilton Head Island has its charm. However, if you're seeking pleasant, dry and sunny weather, our weather planner can help you explore other destinations in the world.

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For a detailed overview over the year and the best time to visit the United States of America, check out our Hilton Head Island's climate page.

Hilton Head Island Temperature in August

Min Temperature 24°C (75°F)  

Max Temperature 32°C (90°F)  

Water Temperature 29°C (84°F)  

Chance of Rain 52%  

Precipitation 199 mm (7.8 in)  

Rainy days 16 days  

Sunshine 251 hours  

Percentage Sunshine 62%  

Daily Historical Temperatures

50-year average (1976-2025)

Based on our historical records, temperatures in Hilton Head Island typically stay consistent throughout August, with daily highs averaging around 32°C (90°F). Nights are warm, with lows around 23°C (73°F).

Average temperatures in August

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Daily Historical Precipitation

50-year average (1976-2025)

Average daily rainfall for each day of the month based on long-term records.

Average precipitation in August

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Historical weather for Hilton Head Island in August

Browse day-by-day weather records for Hilton Head Island spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.

Historical weather Temperatures Precipitation

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Hilton Head Island historical weather extremes in August

According to our 49 years of weather records for Hilton Head Island, the following extremes were recorded between 1976 and 2025.

• The warmest day in August was on August 1, 1999, with a maximum of 38°C (100°F).
• The lowest daytime temperature in August was 18°C (64°F), recorded on August 30, 1986.
• The lowest overnight temperature recorded in August was 14°C (57°F) (August 29, 1986).
• The wettest August day on record brought 86 mm (3.4 in) of precipitation to Hilton Head Island (August 16, 2025).

What to Wear in Hilton Head Island in August

Warm temperatures in August make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Heavy rain is guaranteed, please bring a good poncho and waterproof everything! Expect water temperatures of around 29°C (84°F), which is ideal for taking a refreshing dip. Bring swimwear and consider packing a towel for drying off. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.

What To Do in Hilton Head Island in August

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

8/10

Cycling

7/10

Walking

7/10

Camping

6/10

Outdoor sports

7/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Hilton Head Island's climate page.

More climate data for Hilton Head Island

Temperature Rainfall Sunshine Water Temp

See the full Hilton Head Island climate overview or explore weather in the United States of America.