September weather forecast
Fort Myers Beach, FL

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Weather in September

A notable change in Fort Myers Beach's weather is observed in September, with a reduction in the high temperatures and rainfall that dominated August. However, the month does not bring a significant drop in humidity. The sea remains warm enough for bathing, but a decrease in the average daylight hours indicates the onset of fall. The winds gain speed, further contributing to the climate shift. As September ends, it paves the way for the cooler autumn months ahead.

Temperature

With September's advent, Fort Myers Beach, Florida, sees an average high-temperature of a still hot 86.5°F (30.3°C), subtly shifted from August's 88°F (31.1°C). Fort Myers Beach maintains a minor drop in temperature during September nights, with averages of 79.2°F (26.2°C).

Heat index

September's heat index is computed to be a sweltering 98.6°F (37°C). Ensure additional precautions, heat exhaustion and heat cramps may be expected. Heatstroke could occur from sustained activity.
Realize that the values for the heat index are set for shaded places and light winds. Direct sunlight can cause a surge in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', joins air temperature with relative humidity to produce a temperature perception for humans. The effect is experienced differently by individuals, hinging on unique characteristics such as body mass, stature, and level of activity. Always consider that direct sunlight exposure might heighten the heat's effects, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young ones often disregard the necessity to rest and hydrate. Thirst usually indicates advanced dehydration - hence, it is key to stay hydrated, particularly during ongoing physical activities.
Perspiration and the resultant sweat evaporation are the body's natural thermostat, helping regulate temperature. When the air contains significant moisture, the efficiency of the evaporation process decreases, preventing the body from cooling down effectively and creating a feeling of overheating. When body temperature rises due to excess heat gain beyond its removal capability, one might experience heat-related disorders.

Humidity

In Fort Myers Beach, the average relative humidity in September is 75%.

Rainfall

In Fort Myers Beach, in September, it is raining for 25.3 days, with typically 6.18" (157mm) of accumulated precipitation. In Fort Myers Beach, Florida, during the entire year, the rain falls for 190.9 days and collects up to 41.73" (1060mm) of precipitation.

Ocean temperature

In September, the average ocean temperature in Fort Myers Beach is 85.6°F (29.8°C).
Note: Between the temperatures of 77°F (25°C) and 84.2°F (29°C), water is considered very warm, providing pleasure in water activities without discomfort over lengthy periods.

Daylight

In September, the average length of the day in Fort Myers Beach is 12h and 18min.
On the first day of the month, sunrise is at 7:07 am and sunset at 7:47 pm. On the last day of September, sunrise is at 7:20 am and sunset at 7:14 pm EDT.

Sunshine

In Fort Myers Beach, the average sunshine in September is 9.1h.

UV index

May through September, with an average maximum UV index of 7, are months with the highest UV index. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: A maximum UV index of 7 in September translates into the following recommendations:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. UV radiation from the Sun is most intense between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes. Attention! UV strength is notably upped by the reflection of sand and water.
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Frequently asked questions

Is it hot in Fort Myers Beach during September?

September temperatures in Fort Myers Beach, Florida, vary between a high-temperature of 86.5°F (30.3°C) and a low-temperature of 79.2°F (26.2°C). The average heat index (a.k.a. 'felt air temperature', 'feels like'), which combines air temperature and relative humidity, in September is computed to be 98.6°F (37°C).

What is the average humidity in September in Fort Myers Beach?

The average relative humidity in September is 75%.

How many days does it rain in September in Fort Myers Beach?

In Fort Myers Beach, in September, it is raining for 25.3 days, with typically 6.18" (157mm) of accumulated precipitation.

How warm is the water in September in Fort Myers Beach?

In September, the average ocean temperature is 85.6°F (29.8°C). For any water activity, surface water temperatures between 77°F (25°C) and 84.2°F (29°C) are considered as excellent and extremely pleasant for lengthened periods.

How many hours of daylight does Fort Myers Beach have in September?

In Fort Myers Beach, Florida, the average day length in September is 12h and 18min.

What time are sunrise and sunset in September in Fort Myers Beach?

In September, on the first day of the month, sunrise is at 7:07 am and sunset at 7:47 pm. On the last day of the month, in Fort Myers Beach, sunrise is at 7:20 am and sunset at 7:14 pm EDT.

How many hours of sunshine does Fort Myers Beach have in September?

In September, the average sunshine duration in Fort Myers Beach is 9.1h.

When is the highest UV index in Fort Myers Beach?

May through September, with an average maximum UV index of 7, are months with the highest UV index in Fort Myers Beach, Florida.

What is the UV index intensity in September in Fort Myers Beach?

The average daily maximum UV index in September in Fort Myers Beach, Florida, is 7. A UV Index estimate of 6 to 7 represents a high health threat from exposure to the Sun's UV radiation.

Average temperature in September
Fort Myers Beach, FL

Average temperature in September - Fort Myers Beach, FL
  • Average high temperature in September: 86.5°F

The warmest month (with the highest average high temperature) is August (88°F).
The month with the lowest average high temperature is January (69.8°F).

  • Average low temperature in September: 79.2°F

The month with the highest average low temperature is August (81.1°F).
The coldest month (with the lowest average low temperature) is January (59.5°F).

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Average pressure in September
Fort Myers Beach, FL

Average pressure in September - Fort Myers Beach, FL
  • Average pressure in September: 29.95"Hg

The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is September (29.95"Hg).

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Average wind speed in September
Fort Myers Beach, FL

Average wind speed in September - Fort Myers Beach, FL
  • Average wind speed in September: 7.9mph

The windiest months (with the highest average wind speed) are October and November (10.1mph).
The calmest month (with the lowest average wind speed) is July (6.9mph).

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Average humidity in September
Fort Myers Beach, FL

Average humidity in September - Fort Myers Beach, FL
  • Average humidity in September: 75%

The month with the highest relative humidity is December (77%).
The months with the lowest relative humidity are March, May, July, August and October (73%).

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Average rainfall in September
Fort Myers Beach, FL

Average rainfall in September - Fort Myers Beach, FL
  • Average rainfall in September: 6.18"

The wettest month (with the highest rainfall) is August (8.54").
The driest month (with the least rainfall) is February (1.06").

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Average rainfall days in September
Fort Myers Beach, FL

Average rainfall days in September - Fort Myers Beach, FL
  • Average rainfall days in September: 25.3 days

The month with the highest number of rainy days is August (27.3 days).
The month with the least rainy days is February (8.2 days).

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Average sea temperature in September
Fort Myers Beach, FL

Average sea temperature in September - Fort Myers Beach, FL
  • Average sea temperature in September: 85.6°F

The best month for swimming (with the highest average sea temperature) is August (87.2°F).
The coldest month (with the lowest average sea temperature) is January (66.6°F).

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Average daylight in September /
Average sunshine in September
Fort Myers Beach, FL

Average daylight in September / Average sunshine in September - Fort Myers Beach, FL
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 13h and 48min).
The month with the shortest days is December (Average daylight: 10h and 30min).

  • Average sunshine in September: 9h and 1min

The month with the most sunshine is May (Average sunshine: 11h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 36min).

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Average sunshine days in September
Fort Myers Beach, FL

Average sunshine days in September - Fort Myers Beach, FL
  • Average sunshine days in September: 3 days

The month with the most sunshine days is January (19.8 days).
The month with the least sunshine days is August (2.3 days).

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Average UV index in September
Fort Myers Beach, FL

Average UV index in September - Fort Myers Beach, FL
  • Average UV index in September: 7

The months with the highest UV index are May, June, July, August and September (UV index 7).
The months with the lowest UV index are January and February (UV index 5).

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Average cloud cover in September
Fort Myers Beach, FL

Average cloud cover in September - Fort Myers Beach, FL
  • Average cloud cover in September: 28

The month with the most cloud cover is January (Cloud cover 29).
The months with the least cloud cover are March and May (Cloud cover 23).

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Average visibility in September
Fort Myers Beach, FL

Average visibility in September - Fort Myers Beach, FL
  • Average visibility in September: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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Fort Myers Beach, Florida, USA

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