Marco Island, Florida weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Good
Best time to visit: March – May, October – November
What is the weather like in Marco Island, Florida in September?
In September, Marco Island, Florida is hot: daytime highs average 30 °C, and even at night it stays warm at around 25 °C. The sea averages 29.7 °C – almost as warm as a bath. Expect around 6 hours of sunshine a day. It rains often – on about 21 days, adding up to 168 mm. On about 17 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, September is a good month for a holiday in Marco Island, Florida.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 74 | 71 | 85 |
| Day | 31° | 30° | 29° |
| Night | 26° | 25° | 23° |
| Sea | 30° | 30° | 28° |
| Sun | 7 h | 6 h | 7 h |
| Rain days | 24 | 21 | 9 |
More details for September
- Daylight
- 12 h 20 min07:12 – 19:32
- UV index
- 10 · very highclear sky, noon (estimate)All months
- Muggy days
- 30 daysdew point 18 °C or moreAll months
- Wind
- 14 km/haverage daily peakAll months
- Cloud cover
- 65 %on averageAll months
- Hot days
- 17 days30 °C or moreAll months
- Time zone
- UTC−4America/New_York
How the score comes together
- Temperatureweight 35 %100 %
- Seaweight 25 %100 %
- Sunshineweight 20 %55 %
- Few rainy daysweight 20 %0 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in September
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Water bottle – drink plenty
- Insect repellent
- Rain jacket or umbrella
Marco Island, Florida in September: quick answers
Is Marco Island, Florida hot in September?
Yes. In September, Marco Island, Florida is hot: daytime highs average 30 °C and nights stay around 25 °C. On about 17 days the thermometer climbs to 30 °C or more.
Can you swim in Marco Island, Florida in September?
Yes. In September the sea averages 29.7 °C – almost as warm as a bath.
Does it rain much in Marco Island, Florida in September?
It rains often – on about 21 days, adding up to 168 mm.
Marco Island, Florida month by month
The whole year in Marco Island, FloridaAll destinations: USAFlorida weather in SeptemberWhere to go in SeptemberSea temperature in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences