Second mahi run arrives as Keys snapper bite carries into fall

What's biting

What's next

With Sand Key showing notably more wind than Sombrero Key right now, expect a bit of a chop split across the island chain over the next couple of days — Lower Keys and Gulf-side trips may see better conditions than the Atlantic edge until that breeze evens out. Neither buoy is reporting water temperature or wave height this cycle, so captains planning trips this weekend should lean on a fresh local forecast and recent trip reports rather than buoy data alone for sea-state calls.

The mahi window flagged by Saltwater Sportsman is the headline to watch. If that second migration is truly underway, the next few days should bring increasing mahi reports from boats running the Gulf Stream edge and working weed lines — worth pitch-baiting any patch of sargassum or current break you cross on the way to bottom-fishing grounds. That fishery tends to build through late September before tapering, so this is a reasonable window to plan an offshore trip around if mahi are on the target list.

On the reef and flats, yellowtail and mutton snapper have been productive per both Bud n' Mary's and ALL IN Key West, and that bite generally holds through the fall shoulder season even as it eases off its summer peak. Chumming light on the reef edges in calmer wind windows (likely closer to Sombrero Key's current conditions than Sand Key's) should keep producing.

Timing-wise, the waxing crescent moon means tidal flow is moderate right now — well short of the peak flows around full or new moon — so current-dependent structure and channel edges won't be pushing hardest this week. Anglers targeting current-sensitive species may want to hold off a more serious push until the moon builds toward full, when flow increases on the flats and around bridges. Until then, reef and offshore trolling are the more reliable plays given the muted tidal push.

Check a fresh local marine forecast before running offshore, especially given the wind differential between the two buoy sites — conditions on one side of the island chain may not match the other.

Context

Late summer into September is typically a transitional stretch in the Florida Keys, as the peak early-summer snapper and tarpon action described in Bud n' Mary's and ALL IN Key West's earlier-season reports begins to hand off toward fall patterns. The mahi timing flagged by Saltwater Sportsman — a 'second season' arriving in mid-September — is consistent with a normal seasonal rhythm for South Florida, distinct from the larger spring mahi run most anglers plan around; framing this week's arrival as on-schedule rather than early or late fits what that piece describes.

On the regulatory side, CCA Florida's recent reporting on South Atlantic red snapper is worth knowing about even for Keys anglers focused on other species: a federal court issued a preliminary injunction blocking the 2026 red snapper Exempted Fishing Permit pilot programs for Florida and neighboring states just before the Atlantic season was set to open under that framework. Anyone planning a red snapper trip on the Atlantic side should check current state and federal regulations directly before heading out rather than assuming the EFP season is in effect, since this is an active and unsettled legal situation.

Beyond that, there isn't a strong comparative signal in this week's data to say definitively whether the snapper bite or mahi arrival is running ahead of or behind a typical year — the intel gathered here reads as consistent with normal early-fall Keys patterns rather than a notable anomaly.