Every day we analyze satellite sea surface temperature imagery, chlorophyll and bait productivity data, surface current charts, and live NOAA marine forecasts to produce this report. The goal is to give you the clearest possible picture of what’s happening on the water before you book a trip or leave the dock.
Conditions move fast in the Keys. Currents shift, bait schools move, and thermal breaks appear and disappear overnight. A report from two days ago isn’t worth much. We try to update this report daily to make sure you have the most up to date info.
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How to read this report
- Sea surface temperature (SST): Warmer water along the reef corridor (76–80°F) keeps reef fish active and feeding. Cold intrusions from the Gulf side can slow shallow-water species like tarpon early in the morning.
- Chlorophyll / bait productivity: High chlorophyll readings along the reef line mean bait is stacked. This often means yellowtail, mangrove snapper, cobia and others are close behind.
- Surface currents: Moderate Gulf Stream flow past the 408 Hump and Marathon West Hump creates ideal conditions for mahi, blackfin tuna, and wahoo. Slack current along the reef is better for anchoring and chumming.
- Wind and seas: Under 15 knots and seas under 3 feet puts all our trips in play. Anything above that and we focus on protected reef and backcountry options.
Upcoming Fishing Conditions
6/15/2026
Title & Overview
Marathon Fishing Prediction — Monday, June 15, 2026
Overall Fishing Grade: 82/100 (Very Good)
Flat-calm seas and a peak-season offshore bite make tomorrow a run-to-the-edge day — mahi and blackfin tuna are the headline, with a new-moon tide keeping the reef and backcountry in play.
CONDITIONS SNAPSHOT (peak hours 6 AM–6 PM EDT)
- Sunrise 6:35 AM / Sunset 8:14 PM EDT
- Wind: light & variable, E/ENE to SE 3–8 kt
- Seas: 1 ft or less, smooth — an easy offshore run
- Water temp: reef/nearshore 84–86°F; backcountry shallows upper 80s; offshore Straits 83–84°F
- Tides (Vaca Cut): High 11:07 AM (1.2 ft), Low 7:54 PM (-0.3 ft); range ~1.5 ft — strong new-moon spring tide, long afternoon outgoing
- Moon: New Moon, ~0% illuminated — dark night, big tides
- Solunar: Minor ~6:30–7:30 AM (dawn crossover); Major ~12:30–2:30 PM (moon overhead) — the standout window
- Barometer: ~30.05″, stable and high
- Sky: partly cloudy, building afternoon cumulus, isolated PM thunderstorm chance
Why This Grade
Two things are stacking up in your favor tomorrow: it’s peak dolphin season and the seas lay down flat. That combination is what makes a great offshore day — the run out is easy, and the bluewater bite has been the story on the water lately. Mahi and blackfin tuna are filling boxes, and there’s no reason for that to change on a calm, peak-season Monday.
The water tells you where to point the bow. Clean blue oceanic water meets the greener, bait-rich reef water at a defined break a run of roughly 14 miles offshore, with steady current riding that edge. That’s the food line. Troll it, work any weed and frigate birds, and lean on the cleaner blue water down-current. Blackfin have been stacked on the humps and the outside edge — the new-moon current energizes that water, and the early low-light window is when they chew hardest before the sun gets high.
Closer in, the new-moon spring tide keeps the reef and the backcountry honest. There’s a band of bait-rich green water on the reef line, and the strong afternoon outgoing stretches a chum slick well down-current — that’s where the yellowtail and mangrove snapper bite lives, and the new moon fires the summer mangrove pattern. A trophy-class grouper has shown up in the mix this week, too (season’s open). In the backcountry, that same strong drain through the cuts and under the bridges is prime tarpon water. The shallows are warm, so the backcountry bite slides to the cooler early window and the deeper edges.
ZONE-BY-ZONE GAME PLAN
- Offshore (run ~14+ NM — the headline today): Make the easy flat-calm run to the edge. Troll the color break and any weed/color line for mahi; hit the humps and outside edge early for blackfin on the new-moon current. Pitch baits on the temp break. Peak season, easy ride — this is the day.
- Reef & Structure (40–90+ ft): Chum the new-moon outgoing on the reef-line bait band. Yellowtail on light fluoro and flowing baits as the slick sets; mangroves schooled on the patches; muttons on the bottom on the strong tide; grouper (open) on the deeper ledges with bigger baits. Light wind lets you sit over deeper structure.
- Backcountry & Bridges: Tarpon on the new-moon outgoing at the bridges, channels, and oceanside cuts — live baits and crabs on the falling water. Snook tight to structure (catch-and-release). Fish the deeper cuts and the early window; warm shallows midday.
RECENT LOCAL CATCH SIGNAL
Strong offshore. Mahi and blackfin tuna have been the story this week — boxes loaded with dolphin and tuna, day after day. The reef and backcountry have been quieter on the report stream, though that stream leans offshore, so treat the inshore read as “less reported,” not necessarily slower. The conditions support all of it.
SPECIES FORECAST — all 13, highest to lowest
| Species | Score | Technique | Location | Notes |
|---|---|---|---|---|
| Mahi-mahi | 81 | Troll the edge / pitch weed lines | Color break ~14+ NM, blue water | Peak-season dolphin have carried the week — run the clean break, weed lines, and frigate birds on the flat-calm seas, and lean on the cleaner blue water down-current. |
| Blackfin tuna | 78 | Vertical jigs / live bait, early | Humps & outside reef edge | Blackfin have been stacked on the humps — the new-moon current and the early low-light window are when they chew best before the sun gets high. |
| Yellowtail snapper | 71 | Chum + light fluoro, flowing baits | Reef edge 40–90 ft | Still a dependable reef option on the bait band — the new-moon outgoing stretches the slick, so long leaders into the cleaner down-current water earn the better bite. |
| Mangrove snapper | 70 | Live baits, light leader | Patch reefs 20–60 ft | New moon is the summer mangrove trigger — a quiet up-current anchor and steady chum on the patches is the play for schooled-up fish. |
| Grouper (OPEN!) | 68 | Big live/dead baits on bottom | Deeper structure 60–120 ft | A trophy-class grouper has shown this week — fish bigger baits on the deeper ledges on the moving water and be ready to turn one fast off the rocks. |
| Mutton snapper | 66 | Bottom baits, fluoro leader | Reef edges & rubble 50–90 ft | Muttons key on strong moving water, so the midday spring outgoing is the window on the deeper edges and humps. |
| King/Spanish mackerel | 60 | Flatlines/stinger rigs, faster retrieve | Reef line & nearshore edges | They trail the bait band along the reef line — a wire stinger and a faster presentation on the edge of the chum is the better odds. |
| Tarpon | 58 | Live bait/crabs on the falling tide (C&R) | Bridges, channels, oceanside cuts | New-moon spring outgoing is a prime tarpon trigger at the bridges and cuts — fish the strong drain on the falling water, early and late. |
| Snook | 57 | Live bait around structure (C&R) | Bridges & shoreline structure | Work the moving water tight to structure on the outgoing — dark new-moon nights into first light are the better window. |
| Wahoo | 50 | High-speed troll, wire | Deep edge & humps | Riding in the offshore spread — a fast trolled wire bait on the edge is how you add one while you’re out for mahi. |
| Permit | 47 | Crabs on wrecks/edges (C&R) | Nearshore wrecks & channel edges | The strong tide pulls permit onto wrecks and edges, but warm shallows keep it a hunt — work the up-current side. |
| Bonefish | 42 | Sight-fish early, shrimp/flies | Oceanside & Gulf-side flats | Very warm flats push bones to the cooler early window and deeper edges — fish first light in the light wind. |
| Sailfish | 41 | Live bait on the edge | Gulf Stream edge | Off their prime season — more an incidental edge catch than a target while you’re trolling for dolphin. |
BEST BITE WINDOWS
- 1. 6:30–8:30 AM — dawn minor + first light; prime for the offshore run (weed and birds show in good light) and the reef on the morning incoming.
- 2. 12:30–2:30 PM — new-moon solunar MAJOR on the strong spring outgoing; best moving-water window inshore and energized current on the edge.
- 3. 5:30–6:00 PM — late push as the sun lowers and the outgoing still pulls.
SAFETY & NOTES
- No Small Craft Advisory — flat and calm, a good day to make the run. Watch for isolated building afternoon thunderstorms and keep an eye to the west if you’re well offshore. Light boat traffic on a Monday.
LINKS & DEALS
- Daily conditions page: https://captainhooks.com/daily-fishing-conditions-marathon-fl/
- Book a charter: https://captainhooks.rezdy.com/catalog/66597/fishing-charters
- MFP Reel Deal: We are extending the 15% OFF on Billy Baits for ONE DAY!
#MarathonFishing #FloridaKeys #FishingReport #MahiMahi #BlackfinTuna #Dolphin #OffshoreFishing #YellowtailSnapper #NewMoon #CaptainHooks #FishTheKeys
What to Expect When Fishing in Marathon, FL
Marathon sits at the heart of the Florida Keys, with easy access to the Atlantic reef tract to the south and Florida Bay to the north. That geography gives anglers access to three completely different fisheries within a short run of the dock. Try offshore bluewater, nearshore reef and wreck, and shallow backcountry flats.
Offshore fishing
The Gulf Stream runs close to the Keys year-round, pushing warm, clean bluewater within 15–20 miles of Marathon. Offshore structure like the 408 Hump and Marathon West Hump concentrate baitfish and attract pelagics in numbers that few places on the East Coast can match. Mahi-mahi are the bread-and-butter species spring through summer, with blackfin tuna and wahoo filling the box on the right day.
Reef and wreck fishing
The Florida Keys reef tract is one of the most productive fishing grounds in North America. Yellowtail snapper and mangrove snapper are on the reef virtually every day of the year. Mutton snapper and cobia show up in numbers during spring. Expect action from grouper (when in season), amberjack, cero mackerel, and barracuda.
Backcountry and flats fishing
Florida Bay and the grass flats north of Marathon are some of the best tarpon and bonefish water in the world. Tarpon migrate through the Keys from April through July in serious numbers. Permit, snook, and redfish round out the backcountry offering.
Seasonal fishing guide for Marathon, FL
- Winter (Dec–Feb): Yellowtail and mangrove snapper fire up in cooler water. Sailfish peak offshore. Calm weather windows make for excellent bottom fishing days.
- Spring (Mar–May): The best all-around season. Mahi arrive in force by March. Cobia move through the reef. Tarpon migration kicks off in April.
- Summer (Jun–Aug): Mahi, tuna, and wahoo offshore. Consistent reef fishing. Morning trips are the move before afternoon thunderstorms build.
- Fall (Sep–Nov): Kingfish move in. Reef fishing stays strong. Cooler temps and lighter crowds make fall an underrated time to fish the Keys.
Bait, tackle, and trip planning
Our Marathon bait and tackle shop carries fresh, live, and frozen bait along with everything you need for a day on the water. For a fully guided experience, our Marathon fishing charters cover all three fisheries. Also fishing out of Big Pine Key if that puts you closer to the action.
Marathon • Big
Pine Key • Key West
Ready to Fish?
Charters run daily. Reef, offshore, and flats. Book online or give us a call.