September weather forecastMarco Island, FL
September
Weather in September
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.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Marco Island, FL
- Average high temperature in September: 90°F
The warmest months (with the highest average high temperature) are July, August and September (90°F).
The months with the lowest average high temperature are January, February and December (75°F).
- Average low temperature in September: 73°F
The month with the highest average low temperature is August (75°F).
The coldest months (with the lowest average low temperature) are January and February (55°F).
Average rainfall in September
Marco Island, FL
- Average rainfall in September: 8.1"
The wettest month (with the highest rainfall) is June (9.2").
The driest months (with the least rainfall) are November and December (1.5").
Average rainfall days in September
Marco Island, FL
- Average rainfall days in September: 15 days
The month with the highest number of rainy days is August (16 days).
The month with the least rainy days is April (4 days).
Average sea temperature in September
Marco Island, FL
- Average sea temperature in September: 85.7°F
The best month for swimming (with the highest average sea temperature) is August (87.3°F).
The coldest months (with the lowest average sea temperature) are January and February (67.2°F).
Average daylight in September /
Average sunshine in September
Marco Island, FL
- Average daylight in September: 12h and 18min
The month with the longest days is June (Average daylight: 13h and 42min).
The month with the shortest days is December (Average daylight: 10h and 30min).
- Average sunshine in September: 9h
The months with the most sunshine are April, May, June and July (Average sunshine: 10h).
The months with the least sunshine are January, November and December (Average sunshine: 7h).
Average UV index in September
Marco Island, FL
- Average UV index in September: 10
The months with the highest UV index are April, May, June, July and August (UV index 11).
The month with the lowest UV index is December (UV index 5).
