Yes. Parts of downtown Charleston flood during many king tides — often on a clear, sunny day with no rain in sight.
But "Charleston floods" is one of the most misunderstood statements people make about this city. Not every king tide floods the peninsula. Not every street floods. And the difference between a house that stays dry and one that doesn't can come down to a foot or two of elevation, or which side of a block it sits on.
I'd rather you understand exactly how this works than either panic about it or ignore it. Both mistakes cost buyers money.
What is a king tide?
"King tide" is the everyday name for what scientists call a perigean spring tide. It happens when a new or full moon lines up with the moon's closest approach to Earth in its orbit. The extra gravitational pull produces the highest astronomical tides of the year.
In Charleston, the average high tide is about 5.5 feet. During a king tide, the tide can reach 7 feet or higher. Those numbers are measured at the Charleston Harbor tide gauge, and the National Weather Service uses them to define three flood thresholds:
- 7.0 feet — minor flooding
- 7.5 feet — moderate flooding
- 8.0 feet — major flooding
A king tide on its own often peaks right around the minor threshold. What pushes it higher is everything else happening at the same time: a northeast wind piling water into the harbor, heavy rain that has nowhere to drain, or an offshore storm system. That's why two king tides with similar predicted heights can produce very different results.
Which streets flood at each level?
Here's roughly what happens on the peninsula as the harbor rises.
At 7 feet (minor): Water reaches the lowest-lying areas, including Lockwood Drive, Wentworth and Barre streets, Fishburne and Hagood streets, and Morrison Drive. The Hagood and Fishburne intersection is one of the most familiar flood barricade spots in the city.
At 7.5 feet (moderate): The Medical District begins to flood, along with parts of Highway 17, East Bay Street, and Market Street.
At 8 feet (major): Much of the peninsula is affected, including significant parts of the west side and the areas around East Bay Street. Many of the city's buried tidal creeks — old waterways that were filled in and built over generations ago — effectively reappear, flooding the roads and structures that were built on top of them.
That last point is worth understanding if you're buying downtown. Some of Charleston's flooding follows the map of creeks and marshes that existed in the 1700s and 1800s, not the map of today's streets.
How often does this actually happen?
More often than it used to — and it varies a lot year to year.
In the 1990s, Charleston typically saw somewhere between 10 and 25 tidal flood events a year. In 1924, the city logged zero.
Recent years look very different:
- 2019: 89 tidal flood events
- 2023: 75 tidal flood events
- 2025: 52 tidal flood events — about one a week — with October tying for the second-worst month on record at 18
Some of that variation is weather. A windy, stormy year produces more flooding than a calm one. But the long-term direction is clear: sea level around Charleston has been rising, and the waters are projected to rise about another foot by 2050. The more the baseline rises, the more often a normal king tide crosses the 7-foot line.
The rest of the 2026 king tide dates
According to NOAA and South Carolina Department of Environmental Services predictions, the remaining 2026 king tide windows are:
- September 29–30
- October 10–11
- October 26–29
- November 24–27
Here's a practical detail most people don't know. In the summer, the evening high tide is the dominant one. Around the fall equinox, the two daily high tides are roughly equal. By late October and November, the highest tide shifts to around sunrise.
That means the late-October and November king tides tend to hit right during the morning commute. If you drive into or through the peninsula for work — or to MUSC, Roper, or the Medical District — this is when it matters most.
You can track real-time tide forecasts and road closures using the City of Charleston's TideEye tracker.
Why fall is the season to pay attention
King tides happen throughout the year, but fall stacks the deck:
- The tides themselves are high around the equinox.
- Northeast winds become more common as fall weather patterns set in.
- Hurricane season is still running, and a tropical system passing offshore during a king tide can add feet, not inches.
Some of the highest tides in Charleston's recorded history came from exactly that combination. When Hurricane Idalia arrived during a king tide in 2023, the harbor reached 9.23 feet. A December 2023 nor'easter that hit at high tide pushed it to 9.86 feet. For context, the record is 12.52 feet, set by Hurricane Hugo in 1989.
It's not only the peninsula
The peninsula gets the headlines because it's low, dense, and surrounded by water on three sides. But king tides can also flood low-lying roads on Johns Island, James Island, and Seabrook Island, particularly when they coincide with heavy rain or wind.
On the islands, the concern is usually access — a road that floods for an hour or two around high tide — rather than water in homes. But if your daily routine depends on a single road in and out, you want to know how it behaves at 7.5 feet.
Flood zone is not the same as flood risk
This is where buyers get tripped up.
The City of Charleston puts it plainly: every property in the city is in a flood zone, but not every property is in a FEMA Special Flood Hazard Area — the high-risk zones that trigger mandatory flood insurance for most mortgages.
That creates two misleading situations:
- A house outside the high-risk zone can still be on a street that floods. You may never get water inside, but you can't get your car in or out for a couple of hours several mornings each fall.
- A house inside the high-risk zone may never take water. Many historic Charleston homes were built raised off the ground for exactly this reason. Elevation matters more than the zone label.
What actually tells you how a specific house performs is elevation, flood history, and what happens on that block at high tide. The FEMA map is only the starting point. I cover how the zones work in detail in my article on Charleston flood zones.
Is anything being done about it?
Yes, but it's a long-term project, and it's worth being realistic about the timeline.
The City of Charleston and the U.S. Army Corps of Engineers signed an agreement in December 2025 to begin the preconstruction, engineering, and design phase of a seawall around the peninsula — sometimes called the Battery extension or perimeter protection project. As proposed, it would run from the Ravenel Bridge on the Cooper River, around the Battery, to The Citadel on the Ashley River, likely with a linear park along it.
No construction start date has been set. The total project cost has been estimated at roughly $1.3 billion. The city has also been designing a shorter knee wall along Lockwood Drive to stop that street from flooding during the highest tides, and working with the Corps on a separate study of tidal and inland flooding risk for James Island, Johns Island, Daniel Island, and West Ashley.
If you're buying downtown, the seawall is encouraging for the long term. But it isn't a reason to ignore flood risk on a house you're buying in 2026.
The buyer playbook: how to evaluate a house for tidal flooding
This is the part I care most about. If you're buying anywhere on the peninsula or in a low-lying part of the islands, here's what I have my clients do:
1. Visit during a king tide. Pull up TideEye, pick a date from the list above, and go look at the house and the street around high tide. If you're under contract, try to schedule a drive-by during your due diligence period. Seeing it with your own eyes is worth more than any report.
2. Drive your commute at high tide. The house may be fine. The route to your office, your kids' school, or the hospital might not be.
3. Read the disclosure statement carefully. South Carolina's Residential Property Condition Disclosure Statement was updated in 2023. Sellers now answer specific questions about whether the property has flooded from rising water, whether flood insurance claims have been filed, whether they've received flood disaster assistance, and whether flood repairs were made outside of an insurance claim. Read those answers closely, and ask follow-up questions on anything marked "yes."
4. Ask for the flood claim history and a CLUE report. A CLUE report shows insurance claims on the property, and the flood claim history shows NFIP claims. Both can reveal history the seller may not know about if they haven't owned the home long.
5. Get the elevation certificate. If the seller has one, it tells you how high the lowest floor sits relative to expected flood levels. If they don't, a surveyor can produce one — and it can materially affect your flood insurance premium.
6. Get a flood insurance quote during due diligence. Not after closing. Not at the closing table. During due diligence, while you can still walk away.
7. Ask about parking. On streets that flood regularly, where you park matters. The city often opens select garages for free during significant tidal flooding events.
If you already own in a flood-prone area
A few habits that save money and headaches:
- Move your car before the tide, not during it. Salt water is brutal on vehicles, and it takes only about 12 inches of moving water to carry away most cars.
- Never drive through standing water. You can't see the depth, the curb, or whether a manhole cover has lifted.
- Clear storm drains near your home before predicted king tides.
- Don't count on a portable pump. During tidal flooding, water has nowhere to drain until the tide recedes. Pumps help during rain events, not tidal ones.
- Keep records. If you ever file a flood claim, receipts and photos of how claim money was spent matter.
Should this stop you from buying downtown?
No — not by itself.
People have lived on the Charleston peninsula for more than 350 years, and some of the most desirable homes in the Southeast sit on streets that see water a few times a year. The goal isn't to avoid flood risk entirely. It's to understand it on the specific property, price it in, insure it properly, and choose a house whose elevation and location fit your life.
The buyers who get hurt are the ones who never asked the question. The buyers who do fine are the ones who stood on the sidewalk during a king tide and made an informed decision.
Numbers to verify before you rely on them
- Tidal flood counts vary by source and by how "event" is defined. The 2019 and 2023 figures come from an analysis of National Weather Service records; the 2025 figure comes from Post and Courier reporting. Check the NWS Charleston Coastal Flood Event Database for the most current count.
- King tide dates are predictions from NOAA and SC DES. Actual water levels depend on wind, rain, and weather — always check TideEye in the days before.
- Street-by-street flooding at each threshold is approximate and based on National Weather Service descriptions. Conditions change as drainage projects are completed.
- Seawall timeline and cost reflect reporting from 2025 and could change as design progresses.
The bottom line
Downtown Charleston does flood during king tides — mainly the low-lying streets on the west side, around the Medical District, and along parts of East Bay and Market Street, with the severity depending on how high the tide climbs and what the weather is doing.
The next windows are September 29–30, October 10–11, October 26–29, and November 24–27. If you're thinking about buying downtown or on the islands, use one of them. Go see it for yourself.
And if you want someone to walk the neighborhood with you during a king tide, read the disclosures, and pull the flood history before you commit, call me. That's exactly the kind of homework I'd rather do with you before closing than after.
Article written by:
Dustin Guthrie, Realtor
(843) 697-7757
[email protected]
