Marco Island Naples News — Wednesday, August 26, 2026

🌊 MARCO ISLAND, Fla. — Red tide conditions remain encouraging around Marco Island and much of Southwest Florida this week, while scientists continue monitoring Karenia brevis activity elsewhere around the state.

The latest statewide status report from the Florida Fish and Wildlife Conservation Commission (FWC), issued August 21, found the red tide organism in 25 samples along Florida’s East Coast. On the Gulf side, only background concentrations were detected in two samples offshore of Southwest Florida.

🟢 Marco Island & Collier County: Looking Good

For Marco Island, Naples and the Collier County coastline, there is currently no indication of a significant red tide bloom affecting local beaches.

The detection of only background concentrations offshore of Southwest Florida is good news for local beachgoers, boaters and anglers. Background levels are far below the concentrations normally associated with a significant bloom.

Collier County routinely monitors five locations — Barefoot Beach, Vanderbilt Beach, Seagate Beach/Clam Pass, Naples Pier and South Marco Beach — helping officials track changes along the local coastline.

Marco Island outlook: 🟢 LOW RED TIDE CONCERN

Conditions can change quickly depending on winds, currents and the movement of offshore water, so anyone planning a beach trip should still check the latest observations.

🟡 Florida: East Coast Activity Being Watched

The more notable activity this week is on Florida’s Atlantic coast.

FWC reported Karenia brevis in 25 East Coast samples during the week ending August 21. Bloom-level concentrations — greater than 100,000 cells per liter — were detected in one sample from Nassau County in Northeast Florida.

That doesn’t mean Florida’s entire East Coast is experiencing red tide. Concentrations can vary dramatically from one location to another, and conditions at individual beaches can change with winds and currents.

FWC continues using water sampling along with satellite imagery from USF and NOAA to monitor the situation.

🌴 What Beachgoers Should Know

Florida red tide is caused primarily by the microscopic algae Karenia brevis. At sufficiently high concentrations, it can produce toxins capable of causing fish kills and respiratory irritation.

Breaking waves can release those toxins into the air, sometimes producing coughing, sneezing or throat and eye irritation near affected beaches. People with asthma or other respiratory conditions can be particularly sensitive.

Red tide conditions are also highly localized. One beach can experience irritation while another several miles away has few or no noticeable effects.

📍 Marco Island Beach Outlook

For now, the weekly picture for Marco Island remains favorable:

• 🌊 Significant local red tide bloom: Not indicated

• 🟢 Southwest Florida: Only background concentrations reported in two offshore samples in FWC’s latest weekly report

• 🏖️ Marco Island: No major red tide signal

• 🐟 Widespread local fish kills: Not indicated by the latest FWC statewide report

• 👃 Respiratory impacts: No widespread local impacts indicated

• 👀 Next concern: Continue watching offshore sampling as Florida enters the late-summer and fall red tide season

Historically, Florida Gulf Coast red tides occur most frequently from late summer through fall and can persist into winter or spring, making the next several months an important monitoring period.

🔎 Check Before Heading to the Beach

FWC’s daily sampling map displays results from the previous eight days and updates daily at 5 p.m. Mote Marine’s Beach Conditions Reporting System can also provide reports of respiratory irritation and dead fish at participating beaches.

Check the latest Florida Red Tide status from FWC

🌊 Bottom Line

Marco Island and the Collier County coastline remain in good shape this week, with no significant red tide bloom indicated locally.

Florida’s main area to watch is currently the East Coast, where Karenia brevis has been detected at multiple locations and one Nassau County sample reached bloom concentration.

For Southwest Florida, the news remains positive — but with red tide season approaching its historically more active months, Marco Island Naples News will continue tracking conditions each week.