King Tides

Sunny day a shallow pool of water covers a parking lot with two cars in the background

What is a King Tide? 

The king tide is the highest predicted high tide of the year at a coastal location. It is above the highest water level reached at high tide on an average day. King tides are also known as "perigean spring tides". King tides can cause flooding in low-lying and coastal areas, especially if they coincide with bad weather like heavy rains, strong winds, or big waves. They can also cause "sunny day flooding," where streets and other areas flood when it's not raining. In southeast Florida, these typically occur in the fall.  

What dates are the King Tides expected?

King Tides normally occur a few times per year and often cause nuisance flooding in coastal and low-lying areas. More severe flooding may result if King Tides coincide with bad weather conditions such as heavy rains, strong winds, or big waves. However, sea level rise is causing these tides to happen more frequently, to last longer and extend further inland than in the past.

The National Oceanographic and Atmospheric Administration predicts high tides will peak along South Florida's coast during the following days (peaks vary by location). During these periods, high tides will approach the National Weather Service (NWS) "Minor Flooding" threshold.

  • September 6-12 (Full Moon)
  • September 19-25 (New Moon)
  • October 3-25 (Full and New Moon)
  • November 1-10 ((Full Moon)
  • November 18-20 (New Moon)
  • December 2-7 (Full Moon)

While these dates reflect the current prediction for seasonal higher tides, greater than average tides can occur anytime of the year under varying conditions.

How can I prepare for King Tides?

Most of the King Tide impacts are felt along the coast and in very low-lying areas near other water bodies. Residents who want to know which areas could potentially be impacted by the King Tides are encouraged to use some of the resources below which include NOAA Sea Level Rise Viewer and Miami-Dade County Flood Map. 

On the Miami-Dade County map you can zoom into your neighborhood and click on the "flood frequency tab" you will see areas in red that are vulnerable to King Tide flooding. 

Flooding can potentially obstruct access to roadways. If possible, move vehicles to higher ground before the King Tides begin and wash your vehicle down with fresh water after driving through salt water.

Residents in flood zones should prepare for flooding by having protection measures such as sandbags on hand, review their flood insurance policy, and make a plan for flood safety.  

What safety precautions should I take?

The King Tides coincide with hurricane season. As we approach the height of the season, the County urges all residents to remain prepared. Make sure your emergency supply kit is ready, and evacuation plans are in place for you, your family and pets. If necessary, register in advance for emergency and evacuation assistance. Read more in the 2023 Hurricane Guide.

Follow these safety precautions:

  • Do not walk through flood water if possible. It is can be a health hazard.
  • If you do need to walk through flood waters follow good hygiene practices and wash your hands, clothes, and pets after.
  • Do not drive through flooded areas - it is dangerous and can damage your vehicle.  Find an alternative route.
  • Boaters should be aware that high tides cause lower clearance under bridges - check the tide before leaving the dock.

Help the city document where flooding is happening as a result of king tides by sending photos to sustainability@coralgables.com.