September weather forecast
Marco Island, FL

September carries forward August’s weather patterns, with temperatures and rainfall remaining unchanged. The identical temperatures of 90°F (32.2°C) and 73°F (22.8°C) mark the highs and lows of the day. However, September sees a reduction in rainy days to 15, signaling the start of the gradual transition into the drier season. Despite the occasional showers, Marco Island remains an ideal destination for beachgoers, with clear days making way for beautiful sunsets over the oceanic horizon.

Temperature

The height of temperatures is seen during July through September, averaging a high-temperature of 89.6°F (32°C).

Rainfall

In Marco Island, in September, during 15 rainfall days, 8.11" (206mm) of precipitation is typically accumulated. Throughout the year, there are 111 rainfall days, and 51.57" (1310mm) of precipitation is accumulated.

Ocean temperature

In Marco Island, Florida, the average seawater temperature in September is 85.6°F (29.8°C).
Note: For swimming, diving, and enjoying other water activities, the range of 77°F (25°C) to 84.2°F (29°C) in water temperature is considered ideal, offering pleasure for extended periods without discomfort.

Daylight

In Marco Island, the average length of the day in September is 12h and 18min.
On the first day of the month, sunrise is at 7:07 am and sunset at 7:45 pm. On the last day of September, in Marco Island, Florida, sunrise is at 7:19 am and sunset at 7:14 pm EDT.

Sunshine

In September, the average sunshine is 9h.

UV index

The average daily maximum UV index in September is 10. A UV Index value of 8 to 10 symbolizes a very high health hazard from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The maximum UV index of 10 during September leads to these instructions:
Always be cautious. Skin and eyes can be affected swiftly without protection. Seek shade and limit direct Sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its peak, but be aware that not all shade structures provide complete sun protection. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades. A sunscreen with at least SPF 30 should be used liberally and reapplied frequently on cloudy days, especially after swimming or an outdoor workout. Be attentive! The UV exposure is heightened with reflections from sand and water.