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

9/4/2026

Overall Fishing Grade

Overall Fishing Grade: 76/100 (Good) — A flat-calm Friday to open Labor Day weekend, with a short run to a close, clean, current-lined offshore edge and the best sustained morning outgoing of the week on the reef; run early on the edge, chum the reef on the falling water, and beat the afternoon storms and the holiday traffic.

Conditions snapshot (peak window 6 AM–6 PM EDT)

Sunrise 7:06 AM / Sunset 7:41 PM.
Winds light, east to southeast around 5 to 10 knots — workable all day.
Seas a foot or less in Hawk Channel and 1 to 2 feet in the Straits, smooth — no Small Craft Advisory.
Water temperature around 88°F on the reef and hotter on the Gulf-side banks, with cooler, cleaner water offshore in the Straits.
Barometer steady near 29.97 inches — no front.
Sky partly cloudy, hot and humid, high around 90°F, with a chance of scattered afternoon showers and thunderstorms building later in the day.
Moon last quarter, about 46% lit, moonset 2:30 PM.
Tides at Vaca Cut: high 6:22 AM (~1.3 ft), low 1:08 PM (~0.10 ft); daily range about 1.2 feet. A long, sustained outgoing drains from the first-light high all the way to the early-afternoon low, then a gentle flood rebuilds through the afternoon.
Solunar major 6:18–8:18 AM (on the tide top and first light — the best overlap of the day) and 6:48–8:48 PM (evening flood into sunset); minor 1:30–3:30 PM on the low.

Why this grade

Two lanes carry this day, and both are real. The first is the offshore edge, and it is right there. Clean, deep-blue water is pushed up close to the reef line, the color change sits just outside the reef tract off Marathon, and a strong current is running along the shelf edge with a warm ridge of water stacked behind it. The water offshore is cooler and cleaner than the hot nearshore banks, the edge is backed by warm blue with no cold-water intrusion to shut it down — that combination of a close color break, moving current, and warm blue is exactly what concentrates dolphin and holds bait on the troll. With seas a flat foot or less, the run out is short and comfortable: get out early, work the color change and any weedlines or debris in the clean water, and push out to the current edge as the morning builds.

The second is the tide, and it is the best the reef has had in over a week. After a run of small ranges, Vaca Cut gives you a long, sustained outgoing today that drains from the first-light high at 6:22 all the way to the early-afternoon low, and it stacks the strongest, coolest, calmest hours right at the front of the day, on top of the morning solunar major and first light. That is a genuine, hours-long window of falling water in the best part of the day, and moving water is what makes the reef go. A green nutrient line is tracking the reef, the water is warm and active, and grouper season is open, so the bottom program has real range — yellowtail on the outgoing, mangroves and muttons on the structure, grouper on the deeper hard bottom.

The honest cautions are the familiar late-summer ones, plus the calendar. The inshore water is hot — around 88 on the reef and hotter on the Gulf-side banks — so the flats species pull to the edges and their comfortable window shrinks to early and late; the satellite shows no cool-water relief on the banks, so this is a heat game, not a water-quality one. The afternoon carries a scattered storm chance that builds later in the day, so the morning is the clean, comfortable window; the evening solunar major (6:48–8:48 PM) lines up with the gentle flood and sunset but overlaps any building cells and the current is soft by then — fish the front of it and keep a radar eye. And this is the Friday of Labor Day weekend, so expect building boat traffic and busy reef and nearshore water. Run early: it is the best water, the best tide, and the least traffic.

Zone-by-Zone Game Plan

Reef & Structure (30–90 ft): A strong bench, and the morning tide makes it. Anchor and chum the long morning outgoing for yellowtail — the water is clean and warm, so long fluorocarbon leaders and a light drop-back earn their keep, and the falling water stretches the slick for hours. Work the wrecks and reef edges for mangroves and muttons; the mangroves come easier in low light and after dark as they get leader-shy in the clear water, and late summer has them staging on the structure. Open-season grouper sit on the deeper hard bottom — the flat-calm seas make the deep drops workable, and a live bait bridled tight to structure near the tide change beats dead bait. The gentle afternoon flood is a secondary window; the morning outgoing is the one to build the reef day around.
Backcountry & Bridges: A low-light and after-dark game in this heat, but the long morning outgoing gives a genuine fishable window early before the sun climbs. Tarpon and snook work the bridge shadow lines on the falling water; the honest windows are dawn, dusk, and night. The Gulf-side flats are running hot on the satellite, so it is temperature and timing holding the midday shallow bite back, not a lack of fish — fish first and last light.
Offshore (short run to the edge): The day’s headline. Clean blue is close, the color break is just outside the reef line off Marathon, and a strong current is running along the shelf edge with a warm ridge behind it and no cold water to kill it. Run early: troll the color change, weedlines, and floating debris for dolphin in the clean water, then push out to the current edge, and work the humps and edge for blackfin at first light while the current runs hardest, before the cells build. Late-summer fish lean toward schoolies, so run-and-gun the birds and debris rather than sitting on one spot. If the sharks tax you at the hump, move and keep fishing the edge. Wahoo are off their peak, but a high-speed wire spread along the deeper drop-offs and the current edge is a worthwhile pass while you are out on the calm water.

Recent Local Catch Signal — Minimal

First-hand social signal is minimal today — the platforms where the real Marathon dock reports live are login-gated, so treat the absence as “unseen,” not “slow.” What secondary captain reporting we can verify points offshore — dolphin and some blackfin out at the edge and humps — with steady reef snapper on the yellowtail and mangrove. That squares with the season, the calm conditions, and the clean, close, current-lined edge the water is showing. We have no reliable backcountry read today, so the flats scores lean on pattern and water, not reports.

Species Forecast

Species	Score	Technique	Location	Notes
Mahi-mahi	77	Troll the color change / run-and-gun weedlines, debris & birds	Offshore edge & weedlines, 100–300+ ft	The color break is close and a strong current runs the shelf edge — work the clean-water side of the change early, then push to the current edge, and watch for birds and debris before the afternoon cells build.
Yellowtail snapper	74	Anchor & chum, long fluoro leaders, light drop-back	Reef, 30–70 ft	The best moving water in over a week lands right in the morning — chum the sustained outgoing early while it is cool and clean, and long fluoro earns more as the slick stretches on the falling tide.
Mangrove snapper	72	Lighter leaders, low-light & after-dark on structure	Reef & wrecks, 40–80 ft	Staging on the wrecks and reef edges in the late summer with a nutrient line on the reef — lighter leaders in the low-light windows earn the leader-shy fish in the clear water.
Blackfin tuna	70	Live bait / vertical jigs at first light	Offshore humps & edge, 120–250 ft	First light and the strong edge current are the honest window — work the humps where the current runs hardest, and be ready to move off the sharks.
Mutton snapper	65	Live pinfish / plugged ballyhoo on the bottom near tide change	Reef & structure edges, 50–90 ft	Muttons key the same structure as the yellowtail but want a livelier bait — a live pinfish worked near the morning tide change beats dead bait.
Grouper (OPEN!)	59	Big live baits bridled tight to structure	Wrecks & hard bottom, 60–120 ft	Season’s open and the flat-calm seas make the deep drops workable — bridle a big bait tight to structure near the morning tide change and turn its head before it rocks you up.
Tarpon (RELEASE)	57	Live bait on the morning outgoing, bridge shadow lines	Bridges & channels	The sustained morning outgoing gives a real falling-tide window — work the shadow lines at first light before the heat, when resident and bridge fish still eat.
Permit (RELEASE)	53	Live crab pitched up-current	Wrecks & flats edges	Flat-calm, clear water makes the wrecks fishable for sight shots — a live crab on the up-current side is the play, though the soft tide keeps it a timing game.
Wahoo	52	High-speed wire troll along drop-offs & the current edge	Offshore edge & deeper breaks	A live, close, current-lined edge and flat-calm seas make a fast wire spread over the deeper drop-offs a worthwhile pass while you work for mahi.
Sailfish	49	Kite / live bait on the edge	Offshore edge	Off their winter peak, but a close, clean edge with strong current and light seas can raise a fish — treat it as a bonus while pulling on mahi, not the target.
Snook (RELEASE)	47	Live bait tight to structure on moving water	Bridges & backcountry structure	Warm shallows keep them pinned to structure — swim a live bait along the shadow lines through the morning outgoing, best at first light or after dark.
Bonefish (RELEASE)	45	Early/late sight-fishing, shrimp or crab	Flats & adjacent deeper edges	Hot flats and high sun push these to the cooler deeper edges by midday — the early window is the honest shot before the heat shuts the shallow bite down.
King/Spanish mackerel	44	Flashy troll / stinger-rigged live bait	Nearshore & reef edge, 20–50 ft	Off their better season, but light winds set up the nearshore edge — a flashy troll or stinger rig picks up the odd king around bait balls and diving birds.

Best Bite Windows

1) Dawn–early afternoon 7:06 AM–1:08 PM — first light plus the long sustained morning outgoing draining to the early-afternoon low, with the edge current running hardest; the coolest, calmest, cleanest, strongest-moving-water stretch of the day, and the one to run offshore in and build the reef program around.
2) Early solunar major 6:18–8:18 AM — the major sits right on the tide top and first light; the best solunar overlap of the day, kicking off the morning ebb.
3) Evening major 6:48–8:48 PM — the solunar major on the gentle afternoon flood into sunset, but the current is soft by then and it overlaps any building storms; fish the front of the window and keep a radar eye.

Safety & Notes

No Small Craft Advisory — seas are a calm foot or less, easy boating.
The sky, not the wind, is today’s fishability threshold: a chance of scattered afternoon showers and thunderstorms, building later in the day, means you run early and keep a clean radar exit — lightning is the real hazard.
This is the Friday of Labor Day weekend, so expect building boat traffic and busy reef and nearshore water; with lobster season open there are plenty of dive flags — slow down and give divers room.
Hot and humid with a high near 90 — hydrate and mind the sun.

Links & Deals

#MarathonFishing #FloridaKeysFishing #CaptainHooks #FishingReport #MahiMahi #YellowtailSnapper #BlackfinTuna #MangroveSnapper #OffshoreFishing #ReefFishing #SnapperSeason #FloridaKeys #FishingForecast #LaborDayWeekend

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

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Charters run daily. Reef, offshore, and flats. Book online or give us a call.

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Fishing Report for Marathon FL