Florida Sea Level Rise Projections 2026 — Florida

Florida faces some of the most acute sea level rise exposure of any U.S. state, a condition produced by the combination of vast low-lying coastline, porous limestone geology, and position at the junction of the Atlantic Ocean and Gulf of Mexico. The FSU Florida Climate Center documents that sea levels across Florida are approximately 8 inches higher than they were in 1950 and that the rate of rise is accelerating. The NOAA-led 2022 Sea Level Rise Technical Report — the first update to federal projections since 2017, grounded in IPCC Sixth Assessment Report model ensembles combined with tide gauge and satellite altimetry data — projects an additional 10–12 inches of rise along the U.S. coastline by 2050 and at least 2 feet by 2100. The report characterizes the rise expected by mid-century as comparable in magnitude to all of the rise recorded during the previous hundred years.

Florida's institutional response spans federal science agencies, an inter-county voluntary compact, state legislation enacted between 2021 and 2026, and local adaptation investments totaling billions of dollars. Florida Statute §380.093 establishes the framework through which local governments submit vulnerability assessments and project lists to the state's Resilient Florida Program. More than 1,300 miles of Florida coastline — spanning dozens of municipalities and all coastal counties — mean that sea level rise is a policy concern well beyond Southeast Florida, though the Southeast region presents the most documented acute risk.

The scientific foundation for Florida sea level rise planning draws primarily from NOAA tide gauge networks, satellite altimetry, and the modeling ensembles that underlie the 2022 Sea Level Rise Technical Report. Satellite altimetry data indicate that the average rate of sea level rise in the Southeast U.S. region has been approximately 3.0 mm (0.12 inches) per year since the early 1990s, roughly equal to the global rate, according to the FSU Florida Climate Center. The USGS documents the current rate of relative sea level rise in south Florida specifically at 2.4–3.7 mm per year, a range that reflects both global mean sea level change and local land-surface dynamics.

Acceleration is documented at individual tide gauges. At Virginia Key in Miami, the FSU Florida Climate Center reports that sea levels rose approximately 8 inches since 1950 in total, but the pace has quickened to roughly 1 inch every 3 years over the past decade. A longer Miami-area record shows a 6-inch rise from 1985 to 2016 — a 31-year span — while under the U.S. Army Corps of Engineers high scenario, an equivalent 6-inch rise is projected in only the following 15 years, documenting a near-doubling of the rate. The two main physical drivers of global mean sea level change identified in the scientific literature are thermal expansion of warming ocean waters and melting of land-based ice.

The FSU Florida Climate Center, drawing on NOAA's Interagency Sea Level Rise Scenario Tool (Sweet et al. 2022), publishes five sea level rise scenarios — low, intermediate-low, intermediate, intermediate-high, and high — out to the year 2150 for both the eastern Gulf Coast and the Southeast Coast of Florida, reflecting the regionally distinct oceanographic conditions of the two shorelines.

Sea level rise exposure is concentrated along Florida's coastlines but is not uniform in its physical character. The U.S. EPA has characterized Southeast Florida — encompassing Miami-Dade, Broward, Palm Beach, and Monroe counties — as among the most vulnerable regions in the country to sea level rise, flooding, and extreme weather events. The acute exposure in this region results from a combination of extremely low topography, high population density, and porous oolitic limestone geology that allows seawater to migrate upward through the substrate, undermining the effectiveness of conventional seawalls as a sole adaptation measure.

Monroe County and the Florida Keys represent the most extreme documented case. The National Weather Service Key West office describes the Keys' low elevation on a substrate of fossilized coral reef (Upper and Middle Keys) and ancient sandbars (Lower Keys) as producing coastal flooding on average several times per year even without storm events. The shape of Florida Bay acts as a funnel that amplifies water levels on the bayside and slows their recession, compounding flood duration. The Monroe County government initiated LiDAR-based elevation analysis of county roads beginning in 2018 to quantify infrastructure vulnerability.

Florida's Gulf Coast — particularly the Tampa Bay region and the Big Bend area — experiences different physical dynamics. A shallower offshore continental shelf in these areas amplifies storm surge potential even as background sea level rise compounds the baseline flood elevation. The Florida panhandle's generally higher topography and different tidal regime reduce the immediacy of chronic inundation risk relative to South Florida, though Gulf shorelines remain exposed to erosion and surge. The FSU Florida Climate Center maintains separate sea level rise projection graphs for the eastern Gulf Coast and the Southeast Coast to reflect these distinctions. The USGS documents specific concern for the Greater Everglades ecosystem, where relative sea level rise interacts with altered freshwater hydrology to threaten coastal wetland boundaries.

The primary regional planning institution for Southeast Florida is the Southeast Florida Regional Climate Change Compact, a voluntary collaboration of Miami-Dade, Broward, Palm Beach, and Monroe counties. The Compact produced a Regionally Unified Sea Level Rise Projection in 2019 that serves as the adopted planning standard for local governments throughout the four-county region. In a Q4 2024 review, the Compact evaluated the 2019 Projection against the NOAA 2022 Technical Report and observational tide gauge trends, and concluded the 2019 Projection remains appropriate for resilience planning, design, and construction, with a commitment to revisit as new science becomes available on a five-year review cycle.

At the state level, Governor Ron DeSantis signed Senate Bill 1954 on May 12, 2021, establishing the Resilient Florida Program within the Florida Department of Environmental Protection (FDEP). Florida Statute §380.093, enacted through SB 1954, establishes the framework under which local governments submit vulnerability assessments and project funding requests. The state's Protecting Florida Together initiative administers the annual Statewide Flooding and Sea Level Rise Resilience Plan, allocating project-specific funds to coastal counties and municipalities.

In April 2026, Governor DeSantis signed Senate Bill 302, legislation sponsored by Sen. Ileana Garcia of Senate District 36 in Miami-Dade County, who had advanced similar legislation since 2022. As reported by The Invading Sea, SB 302 establishes a statewide permitting process for nature-based resilience projects — such as living shorelines, oyster reef restoration, and mangrove enhancement — and directs FDEP to develop design guidelines for green and hybrid coastal infrastructure. The legislation builds upon the 1996 Mangrove Trimming and Preservation Act and represents the first statewide permitting framework of its kind in Florida.

The Southeast Florida Regional Climate Compact, tracking data via NOAA's Center for Operational Oceanographic Products and Services, documents increasing occurrences of high-tide flooding — events when sea level rise combines with local tidal and meteorological factors to push water above normal high-tide marks without any storm present. These events, sometimes called sunny-day or nuisance flooding, are monitored across Miami-Dade, Broward, Palm Beach, and Monroe county tide gauges. King tides, defined as the highest predicted annual tides, typically peak in fall in South Florida due to warmer water temperatures and seasonal winds; the Compact's charts, prepared with the University of Miami's Climate Resilience Institute as of 2025, project flooding-day frequency at these gauges from 2010 through 2100. The Invading Sea documents that king tide flooding of Miami Beach and downtown Miami streets has been disrupting traffic and businesses with increasing frequency; Miami visitor spending reached $21.1 billion in 2023, according to the same source, illustrating the economic exposure of a tourism-dependent metro to chronic inundation.

Miami-Dade County has adopted a Sea Level Rise Strategy anchored to the Compact's Unified Projection, including an adaptation pathways analysis. Miami-Dade's Miami Forever Bond allocated $192 million specifically for flood prevention. A 2020 Urban Land Institute study commissioned by the Compact calculated that regional adaptation investment would avoid $3.2 billion in structural losses from tidal inundation by 2040 across the four Compact counties. The county's first Adaptation Action Area, centered on the Little River neighborhood, has advanced more than $40 million in projects, including conversion of vulnerable septic systems to centralized sewer. A 2023 economic study cited in connection with SB 302 found that Biscayne Bay alone supports approximately $64 billion in economic output, 448,000 jobs, and roughly $4 billion in annual tax revenue within Miami-Dade County, illustrating the fiscal stakes of coastal ecosystem health.

In Q4 2024, the Southeast Florida Regional Climate Compact completed a formal review of its 2019 Regionally Unified Sea Level Rise Projection, comparing it against the NOAA 2022 Technical Report and regional observational tide gauge records. The Compact issued guidance confirming that the 2019 Projection remains the appropriate planning basis for resilience projects across Miami-Dade, Broward, Palm Beach, and Monroe counties, while committing to future updates as new observational data accumulate.

The 2024–2025 Statewide Flooding and Sea Level Rise Resilience Plan, produced under the Protecting Florida Together initiative, lists project-specific funded expenditures across coastal counties: Miami-Dade wastewater pump station improvements ($3.86 million), South Florida Water Management District C-8 basin resilience projects ($28.1 million), Monroe County Sands neighborhood road and stormwater improvements ($12.2 million), and a Boynton Beach park shoreline resilience project ($536,952).

In April 2026, Governor DeSantis signed Senate Bill 302, establishing the state's first comprehensive permitting framework for nature-based coastal resilience projects and directing FDEP to develop design guidelines for green and hybrid infrastructure, as documented by The Invading Sea. The legislation was sponsored by Sen. Ileana Garcia and builds on protections established by the 1996 Mangrove Trimming and Preservation Act. Separately, a Monroe County-accepted USACE feasibility study outlines a $2.6 billion coastal storm risk reduction project for the Florida Keys, structured as 65 percent federal funding ($1.7 billion) and 35 percent non-federal ($893 million), pending further federal authorization and appropriations.

Sea level rise projections connect directly to Florida's ongoing Everglades restoration effort. The USGS documents that relative sea level rise at 2.4–3.7 mm per year is actively reshaping coastal wetland boundaries in the Greater Everglades ecosystem, threatening the freshwater-to-estuarine habitat gradients that decades of restoration investment aim to protect. Hurricane Irma in September 2017 provided field evidence of how storm events interact with mangrove coastlines in this system, with implications for post-storm wetland recovery trajectories.

Rising baseline sea levels also affect Florida's hurricane and storm surge planning, as higher background water levels effectively raise the starting point from which surge heights are measured during landfalling storms. Port infrastructure at Miami, Port Everglades, Tampa, and Jacksonville all face long-term capital planning decisions that must incorporate NOAA and Compact sea level rise projections to remain serviceable through the mid-century horizon addressed by the 2022 Technical Report.

Florida's property insurance market — already under documented stress — is linked in part to coastal flood risk that sea level rise compounds. The Miami-Dade County Sea Level Rise Strategy acknowledges the interaction between flood risk, property values, and municipal bond creditworthiness in flood-prone neighborhoods. Nature-based solutions enacted under SB 302 connect to Florida's fisheries and marine biodiversity policy, particularly ongoing efforts to preserve mangrove and seagrass habitat along the state's more than 1,300 miles of coastline, as noted in connection with Biscayne Bay's documented role supporting 448,000 jobs and approximately $4 billion in annual tax revenue in Miami-Dade County as of a 2023 economic study.