May Weather on Hilton Head Island

May brings the transition from spring to early summer on Hilton Head Island, offering warmer temperatures, longer sunny days, and ideal conditions for enjoying the beach and outdoor activities. Visitors researching Hilton Head Island weather in May will find that the month typically delivers warm afternoons, comfortable evenings, and increasing ocean temperatures that make beach time even more enjoyable.

Average Temperatures in May

The average temperature on Hilton Head Island in May is noticeably warmer than April but still very comfortable compared to the hotter summer months.

Average High: 80–84°F (27–29°C)
Average Low: 64–68°F (18–20°C)

Daytime temperatures are often warm enough for full beach days, golf rounds, and outdoor dining. Evenings remain pleasant, with light coastal breezes that keep temperatures comfortable for sunset walks along the shore.

Average Rainfall in May

May sees a slight increase in rainfall as the region moves toward summer, but showers are typically short-lived.

Average rainfall: about 3–3.5 inches for the month
Average rainy days: around 7–8 days

Rain usually comes in quick afternoon or evening showers rather than long rainy periods, meaning most days still offer plenty of sunshine.

Ocean Water Temperature

By May, the Atlantic Ocean around Hilton Head Island becomes much more comfortable for swimming.

Average ocean temperature: 72–75°F

This is the time of year when many visitors begin fully enjoying swimming, paddleboarding, kayaking, and other water activities.

What to Wear on Hilton Head Island in May

Packing for Hilton Head Island in May is similar to preparing for early summer. Lightweight clothing works best during the day, with minimal layering needed at night.

Recommended clothing includes:

Shorts and lightweight dresses
T-shirts, polos, or breathable tops
Sandals or casual shoes
Swimwear for the beach or pool
A light sweater or jacket for cooler evenings
Sunglasses, sunscreen, and a hat

The sun becomes stronger during May, so sun protection is especially important if you plan to spend time outdoors.

Are Dogs Allowed on the Beach in May?

If you're visiting Hilton Head Island with your dog in May, it's important to know that beach rules change during the warmer months.

From April 1 through September 30, dogs are allowed on the beach before 10:00 AM and after 5:00 PM, and they must be on a leash. These early morning and evening hours are perfect for enjoying the cooler temperatures and quieter beaches with your pet.

Warm Days and Classic Coastal Weather

Overall, Hilton Head Island weather in May offers the perfect blend of warm sunshine, comfortable ocean temperatures, and vibrant coastal scenery. The island's beaches, bike paths, and golf courses are all in full swing, making May one of the most enjoyable months to experience Hilton Head's outdoor lifestyle before the peak summer heat arrives.