Keys Flats Hit 78°F: Tarpon Migration Peaking, Mahi Active Offshore

What's Biting

What's Next

With 78°F water established at NOAA buoy 41114, temperatures in the Keys should hold steady or nudge marginally warmer through the first week of May—a trend that strongly favors continued activity across both the flats and offshore. The current waning gibbous moon is trending toward the third quarter and neap tides, meaning tidal swings will moderate over the coming days. On the flats, lighter tidal movement tends to spread bonefish and permit more evenly across the grass rather than concentrating them solely at tidal cuts and pinch points. Plan your sessions around the first two hours of incoming tide, when warming water pushes fish up onto shallow banks.

For tarpon, the next three to four weeks represent arguably the best window of the year. May traditionally brings the largest concentrations of migratory silver kings to the Keys, and with water temps right in their preferred range, fish should be actively feeding on the surface. On flat-calm mornings, look for daisy chains and rolling fish before poling into position—sight-fishing windows are longest before afternoon thermals roughen the water and fish go deep.

Offshore, the 2.3-ft wave heights recorded at buoy 41114 indicate comfortable running conditions to the reef and beyond. The spring mahi-mahi run along weed lines in the Florida Straits should remain a productive option. Per Saltwater Sportsman, keeping a pitch-bait rod rigged and ready when fish appear at the surface dramatically improves hook-up rates—react quickly to a blitz or a fish raised on a teaser for the best results. Current breaks holding flying fish and juvenile baits are reliable mahi indicators at this time of year.

Check current state regulations before targeting reef species. Red snapper rules on Florida's Atlantic coast are in active regulatory flux, and any changes could affect offshore planning for the remainder of spring.

Context

At 78°F, Keys surface temperatures are right on seasonal pace for late April. Historically, Keys flats water climbs from the mid-70s in March through the low-to-mid 80s by June, placing the current reading squarely in the expected range—neither an early warm-up nor a cool-water delay. The late-April through May tarpon window is one of the most predictable inshore events in American saltwater fishing, and current conditions align well with the typical pattern showing up on schedule in 2026.

Anglers Journal recently reported that Florida has taken a significant step toward state management of red snapper on the Atlantic coast, with a proposed 39-day recreational season divided into two segments. That regulatory development is worth watching for offshore-minded Keys anglers—if an exempted fishing permit moves forward as requested, it could open a defined snapper season in South Florida waters later this spring or summer. Confirm current rules before heading to the reef.

No local captain or tackle shop intelligence from the Keys was available in this reporting cycle to benchmark 2026 conditions against prior seasons specifically. What the buoy data and seasonal context confirm is that the overall setup is on track: warm water, migrating tarpon, and active offshore species are what the Florida Keys consistently delivers each May, and this year's early indicators suggest no meaningful departure from that pattern.