September weather forecast and climate
Marco Island, FL

Sunset over the beach in Marco Island Beach, Florida, along the Gulf of Mexico
Sunset over the beach in Marco Island Beach, Florida, along the Gulf of Mexico

Weather in September

The first month of the autumn, September, is still a tropical month in Marco Island, Florida, with average temperature fluctuating between 73.4°F (23°C) and 89.6°F (32°C).

Temperature

July through September, with an average high-temperature of 89.6°F (32°C), are the warmest months.

Rainfall

In Marco Island, it is raining for 15 days, with typically 8.11" (206mm) of accumulated precipitation. In Marco Island, during the entire year, the rain falls for 111 days and collects up to 51.57" (1310mm) of precipitation.

Ocean temperature

In Marco Island, the average seawater temperature is 85.6°F (29.8°C).
Note: Water temperature between 77°F (25°C) and 84.2°F (29°C) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

Daylight

In September, the average length of the day is 12.3h.

Sunshine

The average sunshine in Marco Island is 9h.

UV index

The average daily maximum UV index in September is 10. A UV Index of 8 to 10 symbolizes a very high health risk from unsafe exposure to the UV radiation for average individuals.
Note: The daily maximum UV index of 10 interpret into the following advice:
Take extra precautions. Fair-skinned individuals may get burned in less than 10 minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.
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FAQ

What is the warmest month in Marco Island?

July through September, with an average high-temperature of 89.6°F (32°C), are warmest months in Marco Island.

How many days does it rain in September in Marco Island?

In Marco Island, during September, the rain falls for 15 days and regularly aggregates up to 8.11" (206mm) of precipitation.

What is the ocean temperature in September in Marco Island?

In Marco Island, Florida, in September, the average water temperature is 85.6°F (29.8°C). Water temperature between 77°F (25°C) and 84.2°F (29°C) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

What is the average length of the day in September in Marco Island?

The average length of the day in September in Marco Island, Florida, is 12.3h.

How long on average sun shines in September in Marco Island?

In September, the average sunshine is 9h.

How high is the UV index in September in Marco Island?

The average daily maximum UV index in September in Marco Island is 10. A UV Index value of 8 to 10 symbolizes a very high health risk from the exposure to the Sun's UV radiation.

Average temperature in September
Marco Island, FL

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).
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).

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Average rainfall in September
Marco Island, FL

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").

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Average rainfall days in September
Marco Island, FL

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).

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Average sea temperature in September
Marco Island, FL

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).

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Average daylight in September /
Average sunshine in September
Marco Island, FL

Average daylight in September / Average sunshine in September - Marco Island, FL
  • Average daylight in September: 12.3h

The month with the longest days is June (Average daylight: 13.7h).
The month with the shortest days is December (Average daylight: 10.5h).

  • Average sunshine in September: 9h

Months with the most sunshine are April, May, June and July (Average sunshine: 10h).
Months with the least sunshine are January, November and December (Average sunshine: 7).

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Average UV index in September
Marco Island, FL

Average UV index in September - Marco Island, FL
  • Average UV index in September: 10

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).

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