Island Hopping in September: Marco Island & Naples

September Weather, Tides & Hurricane Season on Marco Island

September mornings around Marco Island tend to start glassy — hot, humid and often dead calm before the heat of the day builds anything. That's your window. By early-to-mid afternoon, towering thunderheads stack up over the mainland and push offshore, which is exactly why our captains favor early departures this month and plan to be back at the dock before the sky turns. September also happens to sit at the statistical peak of Atlantic hurricane season, typically landing right around September 10. That doesn't mean every day is a washout — most aren't — but it does mean the honest move is to book a morning slot, hold a backup day if you can, and trust your captain's read of the tropics over any forecast you pull up yourself a week out. You can see the fuller month-wide picture, including every tour type running this September, on our September boat tours page.

Tides haven't flipped back to the winter script yet, so September still runs on summer's pattern: the lowest water of the day shows up in the afternoon and evening rather than at sunrise. That matters for island hopping because it changes when the widest sandbars and strandlines are actually exposed — a late-morning or early-afternoon departure often lines up better with a good low than the pre-dawn start you'd want in January. If you're comparing this trip to other months, our island hopping guide breaks down how that tide script shifts across the calendar.

Best Islands to Hop in September

Keewaydin Island still anchors most September routes — ten undeveloped, boat-only miles of Gulf beach with room to spread out even on a gorgeous Saturday. What's different this month is the water: Gulf temperatures sit in the upper 80s, the warmest of the year, so a September stop here usually means a real swim break between walking stretches, not just a look-and-go. Kice Island, tucked south through the pass, makes a good second stop when the morning stays calm long enough for two islands in one trip — smaller, quieter, and often carrying fresh shell along its strandline after any recent weather.

Further south, the water around Cape Romano rounds out a fuller day, and it's worth being upfront about what you'll actually see there: the dome-shaped houses that made the spot famous were toppled by Hurricane Ian in 2022, and today they sit as half-submerged ruins in the surf rather than the standing structures from older postcards. It's still a striking, worth-the-detour stop by boat — just come with the right picture in your head. On days when afternoon storms build faster than expected, our captains lean on the Ten Thousand Islands mangrove backcountry as a calm-water fallback, a completely different, green and sheltered texture from the open Gulf side that keeps the day moving even when the outer islands get choppy.

How September Storms Reshape These Islands

Here's the part most seasonal guides skip: these islands genuinely move. Every hurricane season, tropical systems passing offshore — even ones that never make landfall nearby — push swell and surge into the Ten Thousand Islands that redistribute sand, cut new channels through the barrier islands, and stack shell in places that were open water the year before. Cape Romano's toppled dome houses are the most visible proof of how much a single storm can change this coastline, but the same forces are quietly reshaping Keewaydin and Kice's sandbars every year, just less dramatically. That's why a September island-hopping trip can look meaningfully different from the same trip you took last September — the shoreline itself is younger.

For you, that mostly shows up as an edge, not a downside. Freshly turned sand often means freshly turned shell that hasn't been picked over — remember that Collier and Lee County allow empty shells only, so anything still alive goes straight back in the water no matter how good it looks. A route that shifted with the last storm can put you on a sandbar that simply wasn't there before. Our captains run these islands constantly and adjust the route to whatever the Gulf handed us that week, which is a real advantage over trying to plan a fixed itinerary yourself months in advance.

Wildlife to Watch For in September

Bottlenose dolphins live in these waters year-round, and September is no exception — you'll often see them working a pass or riding a bow wake somewhere along the route, though as with any wild sighting, nothing is ever guaranteed on a given day. September also marks the closing stretch of loggerhead nesting season, which runs May through October, so it's possible to spot the last hatchlings making their run to the surf on an evening trip, even as the season winds down. Wading birds and shorebirds work the exposed strandlines at low tide with none of the summer crowds to compete with, and if you want a deeper look at what's typically moving through these waters this time of year, our wildlife guide covers it season by season.

What to Pack & How to Book Flexibly

Pack for heat and a possible afternoon downpour: light, breathable layers, real sun protection, water shoes for shell-strewn strandlines, and a dry bag for anything you don't want to get wet. Because September runs on the front-and-storm rhythm of hurricane season rather than February's cold-front pattern, the smartest booking move is to stay flexible on your date if your travel plans allow it and let your captain call the departure window. That's exactly how we plan trips this month, whether you're after a straightforward island-hopping run, want to fold it into a private charter, or just want the freedom to swap Cape Romano for a longer Keewaydin swim stop depending on what the tropics are doing that week.