Florida Keys in Fall: September, October & November

Fall in the Florida Keys moves at its own pace. September holds onto the warmth of summer, October brings long days by the water and the start of stone crab season, while November settles into milder temperatures and breezy evenings.

In Marathon, Isla Bella Beach Resort makes an effortless base for a fall escape, where slow mornings, poolside afternoons and warm evenings by the water set the pace.

Whether you are planning a long Labor Day weekend or a November escape, fall gives you three distinct ways to experience the Florida Keys.

Is Fall a Good Time to Visit the Florida Keys?

Yes. Fall stays warm enough for pool days, boating and time by the water, with temperatures gradually cooling from September through November.

Keep in mind that Atlantic hurricane season runs through November 30, so it is worth checking forecasts before you travel. Beyond that, each fall month offers a slightly different way to experience the Florida Keys.

Florida Keys in September

September keeps the feeling of summer going a little longer. Warm days, tropical air and turquoise water make this a month for spending as much time outside as possible, whether that means an afternoon beside the pool or getting out onto the water.

Florida Keys Weather in September

September is warm in Marathon, with average daily highs around 90°F and lows around 78°F. It is also one of the wetter months of the year, with average monthly rainfall of just over six inches.

That makes flexibility important. Plan outdoor activities for the morning when conditions are most stable, and keep afternoons open in case of rain or heat.

Things to Do in the Florida Keys in September

September still carries the energy of summer, making it a natural month for time on the water. Plan a morning of snorkeling, fishing or paddleboarding, then slow the pace as the afternoon warms up.

Labor Day weekend adds another reason to visit. Isla Bella hosts seasonal resort activities, giving guests an easy way to mix pool time and oceanfront relaxation with holiday-weekend programming.

Check the resort activity calendar for the latest Labor Day programming.

Florida Keys in October

October still feels unmistakably tropical, but the shift into fall becomes easier to notice. The days begin to feel a little more comfortable, the water remains part of the daily rhythm and seasonal flavors start arriving on menus across the Keys.

Florida Keys Weather in October

In Marathon, October brings average highs around 86°F and average lows around 76°F. Rainfall remains part of the month, with close to six inches falling on average, so there is still reason to keep plans flexible.

For many travelers, that combination creates an easy balance: warm enough for the pool and ocean, with temperatures beginning to ease from the height of summer.

Pack light layers for the evening, keep swimwear close and leave space in the schedule for wherever the day takes you.

Things to Do in the Florida Keys in October

October brings a subtle seasonal shift to the Keys, with slightly cooler days that make exploring Marathon especially inviting.

It is also the start of Florida stone crab season on October 15, making this a great month to seek out one of the Keys’ signature seasonal flavors. Pair a day exploring the Middle Keys with waterfront dining, sunset views and an evening back at Isla Bella.

Florida Keys in November

November changes the rhythm again.

Temperatures ease, rainfall drops and mornings can feel especially inviting for getting outside. For travelers looking ahead to winter but hoping to arrive before the season is fully underway, November can be an appealing time to make Marathon home for a few days.

Florida Keys Weather in November

November is noticeably milder in Marathon, with average daytime highs around 81°F and lows around 71°F. Average rainfall drops to less than two inches for the month, compared with close to six inches in October.

The result is weather that lends itself naturally to long mornings outside, afternoons exploring Marathon and evenings dining by the ocean.

Atlantic hurricane season officially continues through November 30, so guests should still check current conditions before traveling.

Things to Do in the Florida Keys in November

By November, drier weather and milder temperatures make it easier to spend more of the day outdoors.

Take advantage of the conditions with fishing, boating, cycling or a walk along the Old Seven Mile Bridge, then settle in for an open-air dinner or a quiet evening by the water. It is a month that lends itself to slower days, longer evenings outside and a more relaxed pace across Marathon.

Stay at Isla Bella Beach Resort This Fall

However you choose to experience fall in the Florida Keys, Isla Bella gives you space to settle into it.

Every guest room and suite faces the ocean and includes private outdoor living space, keeping the water in view from the first coffee of the morning to the last moments of the evening. Across 24 oceanfront acres, five pools, white sand, dining, spa experiences and resort activities make it just as easy to stay in as it is to head out and explore Marathon.

September brings warm, sunlit days and Labor Day energy. October keeps the tropical feeling going with a subtle seasonal shift. November slows into breezier days and evenings made for staying outdoors.

Three months. Three ways to unwind.

One oceanfront escape waiting in Marathon.

Plan Your Fall Florida Keys Escape

Fall does not arrive all at once in the Florida Keys.

It moves gradually, from September sunshine to October evenings and November’s softer temperatures. Choose the month that feels right, leave room for the unexpected and make Isla Bella Beach Resort the place you return to at the end of each day.