Hilton Head Island Weather in September

September in Hilton Head Island brings high temperatures, with daytime highs of 29°C (84°F) and nights around 21°C (70°F). Quite a bit of rainfall is expected, around 123 mm (4.8 in), so pack an umbrella.

Rainfall in Hilton Head Island in September

Typically, about 11 days will experience rainfall, with an average of 123 mm (4.8 in) for the month. Rainfall intensity is on the higher side this month. Expect more substantial showers rather than light, passing rain.

Temperature in Hilton Head Island in September

Daytime temperatures in Hilton Head Island reach 29°C (84°F) in September, dropping to 21°C (70°F) at night. Overall, the month follows a fairly predictable daily temperature pattern. Nights are mild at around 21°C (70°F), which is comfortable for most people.

Sunshine in Hilton Head Island in September

With approximately 211 hours of sunshine, the days are filled with clear skies. It makes it a perfect month for being outside.

Average water temperature in September

The water is 28°C (82°F) this month — warm enough that getting in requires no effort at all. Good conditions for swimming, snorkeling, or just floating around.

Our weather planner can help you find worldwide destinations with pleasant weather during this period. March, April, May, October and November typically offer the best weather for Hilton Head Island.

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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 September

Min Temperature 21°C (70°F)  

Max Temperature 29°C (84°F)  

Water Temperature 28°C (82°F)  

Chance of Rain 37%  

Precipitation 123 mm (4.8 in)  

Rainy days 11 days  

Sunshine 211 hours  

Percentage Sunshine 58%  

Daily Historical Temperatures

50-year average (1976-2025)

Based on our historical records, temperatures in Hilton Head Island typically stay consistent throughout September, with daily highs averaging around 29°C (84°F). Nights are warm, with lows typically ranging from 19°C (66°F) to 23°C (73°F).

Average temperatures in September

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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 September

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Historical weather for Hilton Head Island in September

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 September

Based on weather observations in Hilton Head Island between 1976 and 2025, these are the recorded extremes during September.

• Hilton Head Island recorded its highest September temperature of 37°C (99°F) on September 16, 1980.
• On September 24, 1995, Hilton Head Island saw its coldest September day with temperatures maxing out at 16°C (61°F).
• The lowest overnight temperature recorded in September was 9°C (48°F) (September 23, 1999).

What to Wear in Hilton Head Island in September

Warm weather calls for comfortable, breathable clothing in September. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). High rain levels are expected, so pack waterproof gear and an umbrella or poncho. Expect water temperatures of around 28°C (82°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 September

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

Swimming

9/10

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.