Hilton Head Weather in September
After Labor Day, the island empties. Water is still 80°F.
September is the most underrated month on the Hilton Head calendar. The first week is still peak (Labor Day weekend caps the summer crush), but from week 2 onward, families are back at school, the beaches go quiet, and the water stays at 80°F well into October. We book this window heavily for couples and empty-nesters.
The data, at a glance.
- Avg high
- 85°F
- Avg low
- 69°F
- Ocean temp
- 80°F
- Rainy days
- 10
- Rainfall
- 5.5”
- Humidity
- 70-85%
- Sunset
- 7:25 p.m.
- Daylight
- 12 hours 30 min
- Crowd level
- Peak through Labor Day; quiet week 2 onward
- Rate vs July
- 70%
What September feels like on Hilton Head
Late summer with the lid coming off. Mornings begin to cool slightly. Beaches become genuinely empty after Labor Day (Sept 7, 2026). Locals come out of their air conditioning. The long-season businesses start to relax. Hurricane forecasts dominate the local news but actual storm impacts on the island are rare.
Strongly yes for couples and adults-only trips after Sept 8. The combination of warm water, empty beaches, and 30% off summer pricing is genuinely the best deal on the calendar before October. Hurricane risk is real but historically low; trip insurance is worth the 5-7% premium.
Comparing September against the rest of the calendar? See the full best time to visit Hilton Head guide for the year-round breakdown.
Best for
- Couples post-Labor Day
- Adults-only trips
- Empty-beach golfers
- Underrated swim month (water still 80°F)
Watch out for
- Hurricane season peaks mid-September
- Some seasonal operators reduce hours after Labor Day
- Trip insurance recommended
What’s open in September
Everything year-round operations. Surf school and a couple of sunset-sail operators reduce schedule mid-month. Restaurants stay full. Golf shifts to peak shoulder-season conditions; conditioning improves week over week through the month.
What to pack for Hilton Head in September
Late summer wardrobe. Swimsuits still essential, light layers for slightly cooler evenings, sun shirts and hats. One nicer outfit for dinner. Pack DEET for the late-summer mosquito tail end.
Best things to do on Hilton Head in September
- Empty-beach swims in 80°F water
- Golf with summer-firm greens minus summer humidity
- Sunset sails at 7 p.m. (earlier sunset)
- Couples’ trip with restaurant reservations actually obtainable
- Pinckney Island as fall migration begins
- Late-September dolphin cruises with Captain Mark
When to book for September
Inside-Labor Day: still peak booking pressure. Post-Labor Day: massive relief. Villa inventory opens up significantly; S-tier restaurants take 1-week lead time again. Hurricane-window stays (Sept 10-Oct 5) should carry trip insurance.
Looking for the gear-by-category breakdown? Start with the 10-mistake packing list — what first-timers get wrong, and what to bring instead.
No-see-um defense
May through October the Lowcountry no-see-ums find anyone without picaridin. This is the brand the locals carry, not the grocery-store stuff.
This page contains affiliate links — we may earn a commission if you book through them, at no extra cost to you.
Sawyer Picaridin 20% Insect Repellent
$10–15
The only spray that consistently stops Lowcountry no-see-ums. DEET works on mosquitoes; picaridin works on both. Get the 20% formula.
No-see-um defense — the local non-negotiable
After Bite anti-itch balm
$6–10
For the inevitable bite you'll get before you remember the picaridin. Stops the itch in 30 seconds.
Thermacell portable mosquito repeller
$25–40
For villa decks at dusk — creates a 15-foot bug-free zone. Doesn't smell, doesn't spray, just works.
Book it yourself
This page contains affiliate links — we may earn a commission if you book through them, at no extra cost to you.
Hilton Head September questions we hear most.
- Is September a good time to visit Hilton Head?
- Excellent after Labor Day. Water still 80°F, beaches empty, restaurants reservable, rates 30% below summer peak. The single best month for couples and adults-only trips before October takes that crown.
- Is hurricane season risky for a Hilton Head trip in September?
- Atlantic hurricane season peaks around September 10. Historical odds of a named-storm impact during a specific September week on Hilton Head are around 4%. The probability of a mandatory evacuation is closer to 1%. Trip insurance (5-7% of trip total) is worth the cost for any September booking.
- Is the water still warm in September?
- Yes — 80°F average, identical to early summer. Most visitors don’t realize this. The Atlantic cools slowly; September water feels just like June water. Underrated swim month.
- How crowded is Hilton Head after Labor Day?
- Light. Labor Day weekend (Sept 5-7, 2026) is the last surge; from Sept 8 onward, beaches feel near-empty by summer standards. Coligny is walkable. Restaurants take same-week reservations again.
For the full year-round picture, see the Hilton Head weather guide and best time to visit.
