September Weather on Hilton Head

September on Hilton Head Island offers a blend of late-summer warmth and the first hints of fall. Visitors researching Hilton Head Island weather in September can expect warm ocean temperatures, slightly lower humidity, and fewer crowds compared to the peak summer months. It's one of the best times of year for travelers looking to enjoy the beach while avoiding the busiest part of the season.

With warm days, pleasant evenings, and beautiful coastal scenery, September is popular for couples getaways, golf trips, and relaxing beach vacations.

Average Temperatures in September

The average temperature on Hilton Head Island in September remains warm but begins cooling slightly as the month progresses.

Average High: 83–87°F (28–31°C)
Average Low: 70–73°F (21–23°C)

The heat is generally more comfortable than July and August, especially during the mornings and evenings.

Humidity in September

Humidity levels begin to ease slightly during September, although afternoons can still feel tropical.

Average humidity: 70–80%
Feels-like temperatures: Often reach the low 90s during warmer afternoons

Many visitors find September weather especially comfortable for biking, golfing, and outdoor dining.

Average Rainfall in September

September remains part of the Atlantic hurricane season, so occasional tropical systems are possible, though most days are warm and sunny.

Average rainfall: about 5–6 inches
Average rainy days: 10–12 days

Rain typically comes as brief afternoon showers or thunderstorms rather than extended rainy periods.

Ocean Water Temperature

The Atlantic Ocean stays very warm throughout September, making it one of the best months for water activities.

Average ocean temperature: 80–83°F

The warm water combined with slightly cooler air temperatures creates excellent beach and swimming conditions.

What to Wear on Hilton Head Island in September

Packing for Hilton Head Island in September still means dressing for warm weather, but evenings may feel slightly cooler later in the month.

Recommended clothing includes:

Shorts and lightweight clothing
T-shirts, polos, or breathable tops
Swimsuits and beachwear
Sandals or casual walking shoes
Sunglasses and sunscreen
Light sweater or jacket for evenings
Small umbrella or rain jacket

The combination of warm days and pleasant evenings makes September one of the easiest months to pack for.

Are Dogs Allowed on the Beach in September?

Hilton Head Island's summer dog beach rules remain in effect through September 30.

From April 1 through September 30, dogs are allowed on the beach before 10:00 AM and after 5:00 PM and must remain on a leash. These cooler hours are ideal for walking dogs comfortably along the shoreline.

Early Fall Weather on Hilton Head Island

Overall, Hilton Head Island weather in September offers warm beach days, comfortable evenings, and a slightly more relaxed atmosphere compared to peak summer. With warm ocean water, beautiful sunsets, and fewer crowds, September is considered by many visitors to be one of the best times to experience Hilton Head Island.