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
7/17/2026
Marathon Fishing Prediction
Overall Fishing Grade: 83/100 (Good) — The flattest, cleanest edge of the week lands in peak dolphin season with blue water a short run off the reef — but the tide goes quiet, so this is an offshore day with a dependable reef backup, not a reef day.
Conditions Snapshot — Peak Hours 6 AM to 6 PM (EDT)
- Sunrise / Sunset: 6:45 AM / 8:15 PM EDT
- Wind: Variable near 5 kt in Hawk Channel; East-southeast 5–10 kt out in the Straits — about as light as a July day gets
- Seas: Around 1 ft in Hawk Channel, smooth; 1–2 ft in the Straits (1 ft at 4 seconds) — the calmest water of the week
- Water Temp: ~88°F backcountry and bay; ~86–87°F along the reef line; ~84–85°F out on the edge
- Tides (Vaca Cut): High 6:04 AM (0.7 ft) → Low 8:41 AM (0.5 ft) → High 4:01 PM (1.1 ft) → Low 9:45 PM (0.2 ft); range ~0.9 ft and easing — a long, gentle flood through the middle of the day, with the firmest push after the afternoon high
- Moon: Waxing crescent, 14% lit — moonrise 10:06 AM, overhead 4:33 PM. Nights still dark
- Barometer: ~30.11 in and rising (+1.0 mb over 3 hours) — settled and high, no frontal trigger
- Solunar: Major 3:35–5:35 PM (moon overhead, on the afternoon high); Minor 9:35–10:35 AM (moonrise)
- Sky: Mostly sunny, high near 90°F. Slight shower and thunderstorm chance inside; the Straits look clean
Why This Grade
The wind finally quits, and that decides the day. Hawk Channel goes variable near 5 knots and glasses off to about a foot; the Straits run 1–2 feet on a short four-second period. That is the calmest, most searchable water we have had in a week, and it lands in the middle of peak dolphin season with warm surface water on the edge. The Gulf Stream’s shoreward edge is sitting roughly 12 miles south of the reef — a genuinely short run — and the deep-water read shows the current pressed in tight along the reef line rather than wandering offshore. Clean blue water starts within a short run of the reef, and the color change is stacked right up against it. Calm seas plus a close edge plus a defined break plus peak season is the day, and it is why mahi sit on top of the card and why the offshore run earns the first tank of fuel.
The reef is the honest counterweight, and it is where this forecast parts company with the easy read. The moon has fallen out of the tropics this week, and around Marathon that — not the calendar phase — is what drives the tide. The result is a range down near nine-tenths of a foot and still shrinking, the weakest water in more than a week. There is no hard drain today. What you get instead is a long, patient flood from mid-morning to the 4:01 PM high, and then the day’s firmest push once the tide turns and starts pulling in the late afternoon. That still fishes — yellowtail and mangrove snapper are the most dependable thing in Marathon in July, the water is clean, the sea is flat, and light tackle presents beautifully in these conditions. It just will not fish like the last few days did. Anchor smarter, expect the slick to sit rather than stretch, and lean on the windows where the water is actually moving instead of chumming all day and hoping.
The backcountry is the one place to be plainly honest: it is hot. The bay and the flats are running near 88 degrees with the water carrying heavy summer color, and a weak tide does not flush it. Light wind is a real gift for sight-fishing and it is the reason permit stay worth a look on the nearshore wrecks and channel edges, but hot, colored, barely-moving water is not a flats recipe, and tarpon are past their spring peak and fading into their late-summer pattern. Fish the low-light edges of the day there and do not expect the middle. Coastal mackerel remain in their summer lull. The overall number leans where the day actually is — offshore first, reef second — rather than averaging in the slow flats and coastal reads.
Zone-by-Zone Game Plan
- Offshore — Lead with it, and go early. A short run puts you on the edge in the flattest water of the week. Troll or run-and-gun the weed lines and current rips for mahi and keep a pitch bait rigged for fish that light up on the weeds. The calm also opens the deeper humps and the edge structure for blackfin — jig them or pull a live bait at first light before the sun gets high. Watch the frigate birds and any surface color change. One discipline note on a flat day: calm water makes every weed line look good. If it has no bait, no birds and no life under it, leave it. Do not let a pretty seam hold the boat for an hour.
- Reef & Structure — The dependable backup, worked around the water. Anchor up-current and chum, but pick your windows: the late-morning flood and then the turn after the 4:01 PM high, when the tide finally pulls with some conviction. Yellowtail come up in the slick and the mangroves hold tighter to the bottom and structure; in clean, calm, slow water go longer and lighter on the fluorocarbon than you think you need, and feed the bait back rather than casting at them. Warm reef water pushes the better bite to the low-light edges and to the deeper faces of the patches through the bright middle of the day — that is also where muttons and open-season grouper are worth the drop on the moving water.
- Backcountry & Bridges — A low-light play only. Fish the bridge shadow lines and channel edges at first light and again on the evening pull after the tide turns. Live bait on whatever water is moving is the move for tarpon, though they are fading out of their spring form. Permit are the better backcountry-adjacent shot today and the light wind genuinely helps — look for them staged on the nearshore wrecks and channel edges rather than out on the skinny flats, which are hot and off-color. Expect the middle of the day to go quiet.
Recent Local Catch Signal
Light — call it no read. Neither the social scan nor the morning sweep produced verifiable, timestamped Marathon catches inside the window, and no captain screenshots came in with this run. That is a platform-access limitation, not a report on the fishing. Absence of signal is not absence of fish. The card is scored on season, conditions, and a full satellite read — and the satellite read this run is the strongest input we have had in a week. Treat the offshore and reef calls as condition-driven, because they are.
Species Forecast — All 13, Highest to Lowest
| Species | Score | Technique | Location | Notes |
|---|---|---|---|---|
| Mahi-mahi | 86 | Troll / run weed lines & rips | Offshore edge, surface–mid | Peak season meets the flattest edge of the week and a close, clean break — lean on the early run and keep a pitch bait ready, but abandon a dead weed line fast rather than letting it eat the morning. |
| Blackfin tuna | 80 | Vertical jig / live bait / troll deep | Edge & humps, deeper | The calm is what unlocks this one — the humps are comfortably runnable for the first time in days; the better window is first light before the sun climbs. |
| Yellowtail snapper | 76 | Chum slick, light fluoro, flatline | Reef line, 30–70 ft | Clean, flat water is prime presentation, but a slack tide lets the slick sit rather than stretch — go longer and lighter on the leader and feed baits back on the late-morning flood and the afternoon turn. |
| Mangrove snapper | 75 | Live/cut bait tight to structure | Reef & patches, 25–60 ft | Still inside the easing post-new-moon window, so they should be grouped — the soft tide is the limiter, so watch for the bite to switch on when the water finally pulls after the afternoon high. |
| Mutton snapper | 70 | Bottom rig, live bait, moving tide | Reef edge & deeper patches, 60–90 ft | This one lives on current, and today’s is thin — the better shot is the firmer late-afternoon pull, worked on the up-current side of the deeper patches. |
| Grouper (OPEN!) | 68 | Live/dead bait on the bottom, structure | Reef, wrecks & ledges, 40–90 ft | Season is open and flat seas make the deeper structure easy to fish precisely — the trade is a weak tide, so lean toward the windows with flow and heavier tackle to turn them before the rocks. |
| Tarpon | 68 (RELEASE) | Live bait on the tide, bridge shadows | Bridges & backcountry channels | Past their spring peak and settling into the late-summer pattern — the better window is the low-light shadow lines on whatever water is moving; the middle of the day lulls in the heat. |
| Wahoo | 65 | High-speed troll / deep planer | Offshore edge & drop-offs, deeper | The calm makes the deep high-speed troll comfortable rather than punishing — a bonus around the low-light change, not the day’s target in mid-July. |
| Permit | 64 (RELEASE) | Crab / live bait, wrecks & edges | Nearshore wrecks & channel edges | Light wind is a genuine gift for spotting them, but hot, colored flats argue for the wrecks and channel edges instead — harvest closed this month, release only. |
| Snook | 60 (RELEASE) | Live bait, bridge & channel edges | Bridges, passes, backcountry | Warm water keeps them on the shadow lines, but a soft tide takes away the ambush — the better window is first and last light; Atlantic harvest closed, catch-and-release only. |
| Bonefish | 55 (RELEASE) | Sight-fish, shrimp/crab, skinny water | Oceanside flats, dawn | Near-88°F flats and heavy summer color are the story here — the one honest window is first light on the higher water before the heat pushes them off; slow down. |
| Sailfish | 54 | Troll / kite, live bait | Offshore edge, deeper | Calm seas make them easier to target if one shows, but midsummer is off-season — a bycatch shot on the troll; the better billfish odds return with the fall. |
| King/Spanish mackerel | 52 | Flatline / troll, wire leader | Nearshore edge & wrecks | Summer lull, and a weak tide takes away the current seams that concentrate them — watch for a straggler on the wrecks, but this is not the day’s story. |
Best Bite Windows
- 6:45–9:30 AM — First light on a flat edge. The day’s best offshore window: calm, clean, and the run is easy before the sun gets high. Low-light reef and bridge shadow lines work at the same time.
- 9:35 AM–12:00 PM — Moonrise minor on the building flood. The tide finally starts moving with the morning minor on top of it — the best daytime water for the reef and the patches.
- 3:35–5:35 PM — Solunar major on the afternoon high. The moon rides overhead right as the tide tops out at 4:01 PM and turns. Best solunar-and-tide overlap of the day, and the firmest pull the reef gets.
Safety & Notes
- No Small Craft Advisory — seas around 1 ft inside and 1–2 ft on the edge make this the most comfortable boating of the week.
- Heat is the real hazard today, not the water: high near 90°F, light wind, and 88°F sea surface mean the heat index pushes past 100 on the water.
- Carry more water than you think you need, wear sun protection, and watch your crew and your catch — fish released in 88-degree water need a quick, careful release.
- Slight shower and thunderstorm chance inside through the afternoon; keep an eye to the west and be off the water before anything builds.
- Expect summer traffic around the ramps and bridges. Mini-lobster sport season is still two weeks out (July 30–31) — not this week.
Links & Deals
- Full daily conditions page: https://captainhooks.com/daily-fishing-conditions-marathon-fl/
- Book a charter: https://captainhooks.rezdy.com/catalog/66597/fishing-charters
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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.