Charleston Harbor warmth lingers as fall transition lags behind

What's next

Water still sitting in the high 70s means the fall transition here is running behind schedule compared to points farther north on the coast. As nearshore temperatures ease toward the mid-70s over the coming weeks, expect False Albacore activity to build; Sport Fishing Mag's fall-migration coverage notes false albacore feeding aggressively on the surface as the season turns, a pattern that extends down the South Atlantic coast.

Plan trips around the tide: the late-morning high pushes moving water through midday, with the afternoon low opening a second window before dark. The Waning Gibbous moon this week means stronger-than-average tidal swings compared to the quarter phases, worth building into timing around current-dependent structure.

Context

Late September in Charleston Harbor usually falls in the shoulder period between summer's warm-water pattern and the more decisive fall transition that typically firms up through October as the coast cools. A high-70s reading is on the warm side for this point in the calendar, consistent with a slower fall arrival this year. This is generally when nearshore predators start keying on bait pushed by shortening days and cooling water, though harbor temperatures often lag the open coast by a couple weeks.