Hilton Head Weather in May
Last quiet month before summer. Bath-warm water by Mother’s Day.
May is the sleeper pick on the Hilton Head calendar. Water hits 74°F (swimmable for adults), afternoons reach the low 80s, but villa rates are still 20% below July peak and the bike paths are not yet stacked. Couples and families with elementary-age kids find their best week of the year here.
The data, at a glance.
- Avg high
- 81°F
- Avg low
- 63°F
- Ocean temp
- 74°F
- Rainy days
- 6
- Rainfall
- 3”
- Humidity
- 60-75%
- Sunset
- 8:15 p.m.
- Daylight
- 13 hours 50 min
- Crowd level
- Moderate (Memorial Day surge end of month)
- Rate vs July
- 80%
What May feels like on Hilton Head
Real summer. Shorts and tees by 9 a.m., humidity bumps to 65-75% by afternoon, and the long daylight (sunset at 8:15) means pool hangs run until 8:30 p.m. The Atlantic crosses the swimming threshold by mid-month and feels comfortable by month-end. Memorial Day weekend (May 23-25, 2026) brings the year's first real summer crowd.
Strongly yes for couples and families. May is the single most underrated week on the calendar. Book before mid-March for oceanfront villas; Memorial Day weekend specifically requires 4-5 months lead. The week before Memorial Day (May 17-22, 2026) is a hidden gem.
Best for
- Couples wanting summer weather without summer crowds
- Beach families with kids ages 5-12
- Golfers wanting warm rounds before peak humidity
- Anniversaries, weddings, milestone trips
Watch out for
- Memorial Day weekend books out 4-5 months ahead
- Mosquito and sand-flea season starts mid-month
- Afternoon humidity climbs to summer levels
What’s open in May
Everything. Full seasonal slate. Surf school, sunset sails, all charters, all golf, all activities. The Sea Pines trolley runs full schedule. Bike rentals back to summer staffing.
What to pack for Hilton Head in May
Summer wardrobe. Shorts, tees, swimsuits, sandals. One light layer for occasional cooler evenings. Sunscreen, sun shirts, hats. Swim trunks for ocean and pool.
Best things to do on Hilton Head in May
- First real ocean swim days for adults (water hits 74°F)
- Golf in dry, sunny conditions before summer humidity
- Sunset sails on Calibogue Sound (long daylight)
- Captain Mark dolphin cruise out of Harbour Town
- Long bike rides at low tide (still cool enough to enjoy)
- Memorial Day weekend cookout at the villa
When to book for May
Mid-May (10-22): book 6-8 weeks ahead. Memorial Day weekend: 4-5 months ahead. Restaurants need 2-week lead time at S-tier spots. Activity bookings (dolphin cruise, sunset sail) tighten as the month progresses.
Hilton Head May questions we hear most.
- Is May a good time to visit Hilton Head?
- Yes, May is one of our top three months. Water swimmable by mid-month, afternoons in the low 80s, rates 20% below summer peak, and crowds noticeably lighter than June. Memorial Day weekend is the only crowded window.
- Can you swim at Hilton Head in May?
- Yes by mid-month for adults. Ocean averages 74°F in May; early-season swimmers are in by week 1, and by Mother’s Day weekend the water is comfortable for nearly everyone. Pool weather all month.
- How busy is Memorial Day on Hilton Head?
- Very. Memorial Day weekend (May 23-25, 2026) is the year’s first peak summer weekend. Villa rates lift 30-40%, restaurants overwhelm, and traffic on US-278 bottlenecks Friday afternoon and Sunday morning. Book 4-5 months ahead or shift to the previous week.
- Are mosquitoes bad on Hilton Head in May?
- Mosquitoes start showing up mid-month, especially near marsh edges at dusk. Sand fleas are an occasional issue at lesser-maintained beaches. Bring DEET-based repellent for evening kayak runs or marsh hikes; daytime beach is usually fine.
For the full year-round picture, see the Hilton Head weather guide and best time to visit.
