September 2025 — Florida Keys: Fall Permit Excellent, Bonefish Recovering, Offshore Building. September is a early fall month with water in the 78-84°F range — snook season reopens; bait migrations begin; bull redfish show. Here’s the full breakdown of what’s biting, where to fish, and the most productive tactics.
What’s Biting — September 2025
Primary targets this month: Snapper, Grouper, Mahi, Sailfish.
Snapper
Snapper bottom fishing on the patch reefs and bridge pilings — yellowtail, mangrove, mutton, lane, and red snapper at different depths — vermilion, lane, and mangrove snapper open year-round in most areas. Lighter tackle (20-30 lb), 3/0-5/0 hooks, cut squid or live shrimp.
Grouper
Grouper on the deep reef in 80-180 feet — goliath, gag, red, and black grouper around offshore wrecks and ledges. Live pinfish, large cut sardines, or jigs on 50-80 lb tackle. Federal Gulf season for gag and red grouper varies — verify NOAA/FWC dates. Goliath grouper catch-and-release only.
Mahi
Mahi around the weed lines and color changes 15-30 miles offshore, the Marathon Hump, and any floating debris. Trolled ballyhoo and skirted lures; pitch live bait to anything floating.
Sailfish
Sailfish around the reef edge 4-8 miles off Islamorada, the Marathon Hump, Wood’s Wall off Key West, and the Tennessee Reef. Slower season — fish are scattered. Live bait and high-speed trolling both produce.
Water Conditions & Patterns
Water temperatures are running 78-84°F. Snook season reopens; bait migrations begin; bull redfish show. Bridge fishing in the Keys is driven entirely by current; slack water is dead. Outgoing tide through the channels is the prime tarpon window.
Check the NOAA marine forecast and tide charts before launching. Wind direction often matters more than wind speed for inshore fishing — clean water beats churned water nine times out of ten.
Tactics & Tackle for This Month
- Mullet run. Massive bait migrations trigger feeding frenzies — every predator follows. Target inlets, passes, and beach troughs.
- Topwater dawn. Fall coolness extends the topwater window — walk-the-dog baits produce explosive strikes.
- Front timing. 24 hours before a cold front is typically lights-out; the day after is often slow as fish reset.
September Outlook
Transition month — snook season reopens, false albacore arrive, bait migrations begin.
Regulations Reminder
Red Snapper: federal season; verify NOAA/state dates. Mangrove snapper: 10″, 5 per day. Always verify current state regulations before each trip — slots, bag limits, and seasons change.
Local Resources
Bait & Tackle: World Wide Sportsman (Islamorada, 305-664-4615); Bass Pro Shops Outdoor World (Islamorada); Sea Boots Outfitters (Big Pine).
Public Boat Ramps: Founders Park (Islamorada), Whale Harbor (Islamorada), Marathon city ramps, Big Pine Key, Geiger Key, Key West (Garrison Bight, Stock Island).
Charter Fishing: $500-$900 flats (bonefish/permit/tarpon); $1,000-$1,800 offshore; backcountry skiffs $550-$800.
More Florida Keys Resources
Florida Keys Fishing Guide · Florida Keys Seasonal Calendar · All Florida Keys reports →
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