Fort Myers
Florida, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Fort Myers, FL

Dusk over the pier bridge in Fort Myers, Florida, with cloudy skies and calm waters below
Dusk over the pier bridge in Fort Myers, Florida, with cloudy skies and calm waters below
September, the first month of the autumn, in Fort Myers, is also a hot month, with average temperature fluctuating between 74.3°F (23.5°C) and 90.5°F (32.5°C).

Temperature

In September, the average high-temperature is relatively the same as in August - a still tropical 90.5°F (32.5°C). The average low-temperature, in Fort Myers, is 74.3°F (23.5°C).

Rainfall

In September, the rain falls for 15.4 days. Throughout September, 8" (202mm) of precipitation is accumulated. In Fort Myers, during the entire year, the rain falls for 110.5 days and collects up to 53.4" (1357mm) of precipitation.

Ocean temperature

In September, the average ocean temperature is 84.2°F (29°C).
Note: 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.

Daylight

In Fort Myers, the average length of the day is 12.3h.

Sunshine

In Fort Myers, the average sunshine in September is 8h.

UV index

In Fort Myers, Florida, the average daily maximum UV index in September is 10. A UV Index value of 8 to 10 symbolizes a very high health risk from the exposure to the Sun's UV rays for the ordinary person.
Note: In September, the average maximum UV index of 10 translate into the following recommendations:
Take extra precautions. Protection against sun damage is required. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Even on cloudy days, a sunscreen with a minimum 30 sun protection factor should be generously applied and frequently re-applied, including after every swim or outdoor exercise. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.

What is the temperature in September in Fort Myers?

In September, in Fort Myers, the average high-temperature is 90.5°F (32.5°C), and the average low-temperature is 74.3°F (23.5°C).

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

In Fort Myers, Florida, in September, it is raining for 15.4 days, with typically 8" (202mm) of accumulated precipitation.

What is the ocean temperature in September in Fort Myers?

In September, the average ocean temperature in Fort Myers, Florida, is 84.2°F (29°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 Fort Myers?

In Fort Myers, Florida, the average length of the day in September is 12.3h.

How long on average sun shines in September in Fort Myers?

In September, the average sunshine is 8h.

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

In Fort Myers, Florida, the average daily maximum UV index in September is 10. A UV Index reading of 8 to 10 represents a very high health threat from the exposure to the Sun's UV radiation.
Average temperature in September - Fort Myers, FL
  • Average high temperature in September: 90.5°F

The warmest month (with the highest average high temperature) is July (91.9°F).
The month with the lowest average high temperature is January (74.7°F).

  • Average low temperature in September: 74.3°F

The month with the highest average low temperature is August (74.9°F).
The coldest month (with the lowest average low temperature) is January (53.7°F).

Average rainfall in September - Fort Myers, FL
  • Average rainfall in September: 8"

The wettest month (with the highest rainfall) is June (9.3").
The driest month (with the lowest rainfall) is April (1.4").

Average rainfall days in September - Fort Myers, FL
  • Average rainfall days in September: 15.4 days

The month with the highest number of rainy days is August (17.9 days).
The month with the lowest number of rainy days is April (4.2 days).

Average sea temperature in September - Fort Myers, FL
  • Average sea temperature in September: 84°F

The best month for swimming (with the highest average sea temperature) is August (86°F).
The coldest month (with the lowest average sea temperature) is February (70°F).

Average daylight in September / Average sunshine in September - Fort Myers, FL
  • Average daylight in September: 12.3h

The month with the longest days is June (Average daylight: 13.8h).
The month with shortest days is December (Average daylight: 10.5h).

  • Average sunshine in September: 8h

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

Average UV index in September - Fort Myers, FL
  • Average UV index in September: 10

Months with the highest UV index are April, May, June, July and August (UV index 11).
Months with the lowest UV index are January and December (UV index 5).