Jupiter Offshore Fishing ReportWeek of Sep 14 · out of Jupiter Inlet

Friday weather: CAUTION. Winds stay under 9 knots ESE, but leftover 4.7-foot seas from the northeast take until mid-morning to drop toward 3 feet, and nearly three-quarters of an inch of rain is forecast. It's fishable for a well-found boat with a late start, but Saturday and Sunday are both GO with 2-foot or smaller seas — if you can pick, Sunday is the flattest.

The headline is the Muliphen Reef, about 35 miles up the coast from Jupiter Inlet. A sharp SST front runs north-south here with a 2.5°F break across a transition only 4 miles wide — the warm side lies east where Stream water sits near 87°F, the cooler shelf water inshore of it. This is the western wall of the Gulf Stream pinned against the shelf, and the strong thermal front here has held position for three days, long enough for bait to load up along it. The strong north-flowing current just outside the break keeps that edge tight. Water color shifts gradually greener toward the beach across a broad 17-mile transition (roughly 0.10 rising to 1.0 mg/m³), so treat that as general context rather than an edge to run — the temperature break is the line to fish. Troll the warm eastern side in the clean Stream water for blue marlin, which are right at home in 85–87°F, and work back across to the cooler inshore side where the shelf water bottoms out near 84°F for wahoo along the break. Keep an eye out for debris riding the edge for tripletail. Two wrecks lie 2 and 3 miles away over roughly 170 feet of bottom — when the trolling slows, drop for mutton snapper, grouper (check current regulations) and greater amberjack. Friday's moon is a growing crescent at about half-lit, a week out from full, so expect a steady daytime bite; the strongest feeding window falls around sunset, so it's worth staying through the last hour of light.

Closer to home, the Muliphen Reef sits about 28 miles out along a moderate SST color break with a 1.5°F step spread over 7 miles — a modest temperature change, not a hard edge, but it marks the Stream's inside boundary. The real draw here is the water column: the warm layer holds 84–85°F down to about 150 feet, then the steepest temperature drop runs from roughly 300 to 500 feet, bottoming near 62°F. That's a big thermocline over 700 feet of bottom, which sets up a daytime deep-drop for golden tilefish while you troll the surface edge for blue marlin. A closer run when the weather is questionable.

Two more spots fall in the inshore band on the Bahamas side and are only realistic for boats already over there or on an overnight. The Ledge CHL Hotspot shows a chlorophyll spike to 5.26 mg/m³ that has persisted three days over 366 feet of bottom, but at that concentration the green-brown water is more likely sediment or runoff than clean bait water — treat it as a snowy grouper and greater amberjack deep-drop spot on the ledge rather than a pelagic edge. The Deep Slope Color Change carries a moderate 1.3°F step across a 10-mile transition over 644 fathoms of clean blue water — a gradual warming rather than an edge, though the deep water and 86°F surface suit blue marlin if you're passing through.

Friday weather: CAUTION. Seas are a manageable 2.3–3.4 feet from the NNE and winds stay under 9 knots, but more than half an inch of rain is forecast, which cuts visibility on a 50-mile run. Saturday is a clean GO and Sunday is near-glassy with 1-foot seas — for the bank crossing, Sunday is the day.

The Deep Edge CHL Front sits about 49 miles east of Jupiter Inlet where the deep western edge of the bank drops into the Stream. A sharp CHL front runs 43 km along this edge with the water 3.6 times greener on the eastern bank side (0.67 vs 0.19 mg/m³) — clean blue offshore water pressing against the productive bank water over a 9-mile transition. There's almost no temperature step across it (a weak 0.7°F break), so this is a color change to fish, not a thermal edge. A steady 0.6–0.9-knot current runs NNW along the edge and the flow is divergent across it, which tends to pull bait off the bank into the clean water. The bottom is the reason to commit a day here: 214 fathoms — about 1,280 feet — puts you squarely in daytime swordfish deep-drop range, with the temperature falling from 86°F at the surface through the steepest drop between 155 and 255 feet and down to 79°F by 300 feet. Rig a squid and work the bottom off the edge while a spread runs on the clean western side for blue marlin — sight feeders patrol the blue side where they can see bait coming off the green water. Debris pushed up along the color line is worth a look for tripletail.

A few miles north and up on the bank, the Matanilla Shoal marks the sharpest water color change in the whole area: a 17-to-1 shift from 0.09 to 1.49 mg/m³ across an 8-mile transition, and this line has held for three days. The spot sits two miles west of Matanilla Shoal and three miles east-southeast of White Sands in 84 feet, with a light northerly drift. The clean blue water lies west and the bait-rich green bank water east. This is bottom and reef fishing water — yellowtail snapper, mutton snapper and hogfish on the hard bottom around the shoal — and the sharp color edge tells you the bait is stacked right on the bank rim. Remember the Bahamas permit requirements before fishing this side.

Further east on the bank, the Bank CHL Hotspot shows a chlorophyll peak of 1.4 mg/m³ in green-brown water over 114 feet — moderate productivity that likely means forage on the bank, with a light current toward the NE. It's a secondary stop for mutton snapper and yellowtail snapper when you're already on the bank; nothing here justifies the 62-mile run on its own.

The one true pelagic feature at the far end of the zone is the Deepwater Cool Pocket, 97 miles from Jupiter north of the bank in 507 fathoms. A cool anomaly of 85.5°F has held two days against surrounding water pushing 87–88°F, with a 0.6-knot current setting ESE through it and the cleanest water in the area (chlorophyll near 0.05–0.07 mg/m³). A strong thermal front runs along the bank's north edge southwest of this pocket, so the cooler water has a defined boundary to fish. Blue marlin are the target in deep, clean 85°F water like this — work the edges of the cool pocket rather than the middle — and the coolest patches slide close enough to 85°F to give wahoo a chance on a high-speed spread. This is an overnight or Bahamas-based run, not a day trip from Jupiter, and Friday's rain makes Saturday or Sunday the better crossing days.

Friday weather: GO — light ESE winds and seas under 1.5 feet, and it only gets calmer through the weekend. The trouble is the water itself: the small slice of true offshore water in reach shows a tight 85.5–86.9°F range and chlorophyll flat around 0.06 mg/m³ with no temperature break, color change or convergence to work. If you're already that far east in the Bahamas, blind-troll the deep blue water for blue marlin around the strong thermal front that runs off the north edge of the bank, or head back west to the midshore bank edge where the color change and swordfish bottom are. Otherwise, spend the day on the shelf-edge break north of Muliphen Reef instead.