MARCO ISLAND, Fla. — Saturday, September 5, 2026 — If you’re hoping September will bring an early taste of fall to Marco Island, you may have to wait a little longer.
Southwest Florida remains firmly locked into its late-summer weather pattern over the next seven days, with high temperatures around 89°F to 93°F (32°C to 34°C), plenty of humidity and recurring opportunities for showers and thunderstorms.
The good news? It won’t rain all day every day. There should still be plenty of usable beach, boating and outdoor time between storms. The greatest thunderstorm risk will generally develop as daytime heating builds, although morning showers are possible on some days.
High: 90°F (32°C) | Low: 78°F (26°C)
Expect a humid and rather cloudy Saturday with the potential for a heavy thunderstorm during the afternoon. Anyone heading to the beach or out on the water should keep an eye on the western and eastern skies for rapidly developing storms.
⚡ Main concern: Afternoon thunderstorms and locally heavy rainfall.
High: 90°F (32°C) | Low: 79°F (26°C)
Sunday looks more unsettled, with mostly cloudy skies and a couple of thunderstorms possible during the day.
Outdoor plans aren’t necessarily a washout, but having a backup plan will be a good idea.
🌧️ Main concern: Scattered thunderstorms and brief heavy downpours.
High: 89°F (32°C) | Low: 77°F (25°C)
Monday brings a mixture of clouds and sunshine with continued high humidity. A spotty afternoon thunderstormremains possible.
This could be one of the slightly cooler days of the week — although with the humidity, it probably won’t feel particularly cool.
High: 92°F (33°C) | Low: 76°F (24°C)
Temperatures begin climbing again Tuesday. Expect periods of clouds and sunshine with another chance for an afternoon thunderstorm.
The combination of heat and humidity could make afternoon conditions feel considerably hotter than the actual air temperature.
High: 93°F (34°C) | Low: 77°F (25°C)
Wednesday could be among the hottest days of the week, with temperatures reaching the lower 90s.
Variable cloudiness and another thunderstorm are possible as tropical moisture remains over Southwest Florida.
🥵 Main concern: Heat, humidity and thunderstorms.
High: 92°F (33°C) | Low: 76°F (24°C)
Thursday may start with a few spotty showers before additional thunderstorms develop during the afternoon.
There should still be periods of sunshine between showers and storms.
High: 93°F (34°C) | Low: 75°F (24°C)
The week finishes on another hot and humid note. Expect intervals of clouds and sunshine with a couple of thunderstorms possible, particularly later in the day.
The best strategy this week will be simple: get outside early.
Morning hours should generally offer the best opportunities for walking the beach, boating, fishing, golfing and other outdoor activities before daytime heating increases thunderstorm development.
Beachgoers should remember that lightning can occur well away from the heaviest rainfall. If thunder is audible, it’s time to leave the beach and seek shelter indoors.
Despite the calendar moving into September, summer isn’t finished with Marco Island.
Afternoon temperatures will generally reach the upper 80s to lower 90s, while high humidity will make conditions feel significantly hotter at times. Staying hydrated and taking breaks from direct sunshine will remain important, particularly during the afternoon.
☀️ Temperatures: 89–93°F (32–34°C)
🌙 Overnight lows: 75–79°F (24–26°C)
⛈️ Storm risk: Daily, especially afternoons
💧 Humidity: High
🥵 Heat: Hot and muggy throughout the week
🏖️ Best outdoor window: Generally mornings
🌧️ Washout expected? No — but thunderstorms could interrupt outdoor plans each day
Overall, Marco Island is looking at a classic September week: tropical heat, high humidity, sunshine mixed with clouds and almost daily thunderstorms.
For residents and visitors, mornings will generally be your friend. Enjoy the beach early, keep the radar handy, and be prepared to head inside when those familiar Southwest Florida afternoon thunderclouds start building.
Forecast information can change, particularly the timing and coverage of thunderstorms. Check the latest forecast before boating, beach trips or other outdoor activities.
Rain, wind, temperature and satellite — updates automatically, no refresh needed