Record King Tides and Heavy Rain Swamp South Florida Streets as Water Managers Warn the Season Peaks Oct. 27

South Florida is starting October with water in the streets. A run of seasonal king tides set a record at Broward County's Port Everglades tide station on Sunday, Sept. 27, surpassing the water level recorded there during Hurricane Nicole in 2022, and on Thursday, Oct. 1, heavy rain combined with elevated tides prompted the National Weather Service to issue a flood advisory for parts of Miami-Dade and Broward counties.

The flooding is not over. The South Florida Water Management District's king tide season forecast calls for the year's highest predicted tide along the region's coast on Oct. 27, with additional king tide cycles projected through late November. Forecasters and water managers have also warned that a developing El Niño pattern could bring wetter weather and onshore winds that push water levels even higher during that window.

The tides have affected both of Florida's coasts. In the Tampa Bay area, low-lying neighborhoods such as St. Petersburg's Shore Acres saw coastal water on roadways, and local governments from St. Pete Beach to Manatee County warned residents about higher than normal tides through the first days of October.

A record at Port Everglades

The high tide on the morning of Sept. 27 brought the highest water level of the late September flooding episode, according to local news reports citing tide data. At Port Everglades, the reading was the highest since the National Oceanic and Atmospheric Administration established the tide gauge there in February 2018, topping the level recorded when Hurricane Nicole struck Florida's east coast in November 2022.

The high tide measured roughly 2 feet above the normal high tide at both the Port Everglades station and NOAA's Virginia Key station near Miami, according to those reports. That was still below the roughly 2.5-foot threshold that meteorologists use to classify major coastal flooding in the area.

The episode, which ran from about Sept. 26 through Sept. 28, flooded streets in Fort Lauderdale, Miami Beach and Hollywood and forced the closure of a number of coastal roads over the weekend. A notable feature of the event was that it occurred without a tropical storm offshore: the water came from astronomical tides and local conditions, not from storm surge.

NOAA operates a network of tide gauges along Florida's coasts that record water levels every few minutes. The Port Everglades gauge is a relatively new station, with records dating only to 2018, while the Virginia Key station near Key Biscayne has a longer history. Records at newer stations can be broken more easily, but the fact that a sunny-day tide outpaced the water level from a hurricane drew attention from local officials and scientists.

Rain piles on Oct. 1

On Thursday, rounds of rain and gusty winds moved across South Florida as the region began October. The National Weather Service issued a flood advisory covering parts of Miami-Dade and Broward counties, with communities including Fort Lauderdale, Pompano Beach, Hollywood, Weston, Miami Gardens and Miami Shores inside the advisory area, according to CBS News Miami.

Rain falling during high tide is a particular problem in coastal South Florida. Many neighborhoods rely on gravity-fed storm drains that empty into canals, the Intracoastal Waterway or Biscayne Bay. When tides are elevated, those outfalls can be partially submerged, so rainwater has nowhere to go and seawater can flow backward up through the drains into the street.

Forecasters also warned of a high rip current risk at Atlantic beaches, adding to the hazards for beachgoers and boaters during the unsettled stretch.

The timing of the rain also reflects the seasonal transition. South Florida's rainy season traditionally winds down in mid-October, but early October often brings lingering moisture, passing fronts and gusty easterly winds. Those onshore winds can pile water against the coast, adding to tide levels at the same time that rain is falling on already saturated neighborhoods.

Tampa Bay and the Gulf Coast

King tides are not just an Atlantic coast phenomenon. In Pinellas County, the city of St. Pete Beach warned residents that naturally higher than normal tides would run from Sept. 29 through Oct. 1. In St. Petersburg, the Shore Acres neighborhood, which sits at low elevation along Tampa Bay and has a long history of tidal flooding, again saw coastal water spill onto roadways.

Manatee County officials said they expected higher than normal tides from Sept. 28 through Oct. 3. The county identified areas at risk for flooding including Anna Maria Island, Longboat Key, the Bradenton and Palmetto riverfronts, Cortez Village, Palmetto Point, Rubonia and Terra Ceia Island.

Many of those same Gulf Coast communities are still recovering from Hurricanes Helene and Milton in 2024, which pushed record storm surge into Tampa Bay and Sarasota Bay. For residents who rebuilt or elevated homes after those storms, sunny-day tidal flooding is a reminder that water levels remain a recurring concern even in quiet weather.

Tidal flooding on the Gulf Coast can also be influenced by wind direction. Westerly or southwesterly winds push water from the Gulf of Mexico into Tampa Bay and the bays of Sarasota and Manatee counties, while easterly winds tend to hold water back. That means Gulf Coast residents can see flooding vary considerably from one high tide to the next during a king tide period.

What makes a king tide

King tide is an informal term for the highest predicted tides of the year. They occur when the moon is closest to Earth in its orbit, a point called perigee, and when the sun, moon and Earth line up during new and full moons, which strengthens the gravitational pull on the oceans. In South Florida, the highest of these tides tend to cluster in the fall.

Seasonal factors add to the effect in autumn. Ocean water is warmest at the end of summer, and warmer water expands, raising average sea level slightly. Shifts in winds and in the Gulf Stream along Florida's east coast can also add several inches to water levels during this time of year.

Because king tides are driven by astronomy, they can be predicted months in advance, which allows cities and water managers to publish forecasts and warn residents. What is harder to forecast is how local weather, such as heavy rain, strong onshore winds or a passing front, will stack additional water on top of the predicted tide.

The South Florida Water Management District, which manages the regional canal network from Orlando to the Florida Keys, publishes a king tide season forecast and weekly updates. The district also lowers canal levels ahead of heavy rain where possible so that the system has room to absorb stormwater, though high tides at coastal outfalls limit how quickly water can be discharged to the ocean.

Background: a preview of the future

Scientists, including researchers at Florida Atlantic University, have described king tides as a window into South Florida's flooding future. Because sea level along the region's coast has risen over recent decades, tides that once stayed within seawalls and storm drains now regularly reach streets and yards. What is a few days of nuisance flooding each fall today is expected to become more frequent as sea levels continue to rise.

Local governments have responded with significant investments. Miami Beach has spent years raising roads and installing pump stations in vulnerable neighborhoods, and Fort Lauderdale has worked on seawall standards, tidal valves and stormwater upgrades in its most flood-prone neighborhoods. Broward and Miami-Dade counties have both adopted sea level rise planning projections that guide infrastructure decisions.

Saltwater flooding carries costs beyond inconvenience. It can corrode vehicles that drive through it, damage landscaping, stress septic systems and push pollutants into waterways. Repeated flooding can also affect property values and insurance considerations in the most vulnerable neighborhoods, an issue that has gained attention in Florida's real estate market.

Background: the Southeast Florida Regional Climate Change Compact, a partnership of Broward, Miami-Dade, Monroe and Palm Beach counties, publishes a unified sea level rise projection that local governments use when designing roads, seawalls and drainage systems. King tide events give planners real-world data on which streets and neighborhoods flood first.

Safety advice for residents

Local officials and the South Florida Water Management District routinely urge residents to take precautions during king tide periods:

• Avoid driving through flooded streets. Saltwater can damage vehicles, and wakes from passing cars can push water into homes and businesses.
• Check local tide forecasts before parking in low-lying areas, especially near the times of high tide.
• Stay out of floodwater, which can contain sewage, bacteria and debris.
• Clear storm drains near homes of leaves and debris, and report blocked drains to city or county public works.
• Heed rip current warnings at the beach and swim near lifeguards.

Residents can also report flooding to their city or county, and some local governments collect photos and reports of king tide flooding to help prioritize future infrastructure projects.

What's next

The highest predicted tide of the year along South Florida's coast is expected on Oct. 27, according to the South Florida Water Management District, and additional king tide cycles are forecast to continue through late November. The district publishes weekly king tide forecasts that residents can use to plan around high water.

Forecasters will be watching for rain and onshore winds during those peak periods, since weather can add substantially to predicted tide levels. With a developing El Niño pattern, wetter conditions are possible later in the season.

On the tropics, the National Hurricane Center said this week it does not expect tropical cyclone formation in the Atlantic over the next seven days, so the coming flooding risk is expected to come from tides and rain rather than storm surge. Local governments from Broward and Miami-Dade to Pinellas and Manatee are expected to continue issuing advisories as each new cycle approaches.