Cape Coral
Florida, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Cape Coral, FL

September, the first month of the autumn, in Cape Coral, is still a tropical month, with temperature in the range of an average low of 77.5°F (25.3°C) and an average high of 87.3°F (30.7°C).

Temperature

In Cape Coral, Florida, the average high-temperature in September is practically the same as in August - a still tropical 87.3°F (30.7°C). The average low-temperature, in Cape Coral, is 77.5°F (25.3°C).

Heat index

The average heat index is evaluated at a very hot 101.5°F (38.6°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'real feel', 'felt air temperature', or 'feels like', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (wind, clothing, differences in body mass, height, and shape). Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. High relative humidity reduces the evaporation rate, resulting in a lower heat removal rate from the body, causing the perception of being overheated. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 99.5°F (37.5°C) to 100.9°F (38.3°C), thermal conditions are potentially life-threatening.

Humidity

Months with the highest humidity in Cape Coral are September and December, with an average relative humidity of 76%.

Rainfall

In September, in Cape Coral, the rain falls for 21.2 days. Throughout September, 2.6" (66mm) of precipitation is accumulated. Throughout the year, there are 156.4 rainfall days, and 17.95" (456mm) of precipitation is accumulated.

Ocean temperature

In Cape Coral, the average seawater temperature in September is 84.9°F (29.4°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

The average length of the day in Cape Coral is 12.3h.

Sunshine

In Cape Coral, the average sunshine 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 of 6 to 7 symbolizes a high health risk from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 7 in September interpret into the following advice:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. 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. 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. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.

What is the temperature in September in Cape Coral?

In September, in Cape Coral, the average high-temperature is 87.3°F (30.7°C), and the average low-temperature is 77.5°F (25.3°C). In September, the average heat index (a.k.a. 'real feel', 'apparent temperature'), that calculates temperature value influenced by the moisture in the air, is calculated to 101.5°F (38.6°C).

What is the most humid month in Cape Coral?

Months with the highest humidity are September and December, with an average relative humidity of 76%.

What is the average humidity in September in Cape Coral?

The average relative humidity in September in Cape Coral is 76%.

How many days does it rain in September in Cape Coral?

In Cape Coral, during September, the rain falls for 21.2 days and regularly aggregates up to 2.6" (66mm) of precipitation.

What is the ocean temperature in September in Cape Coral?

In September, the average ocean temperature in Cape Coral is 84.9°F (29.4°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 Cape Coral have in September?

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

How many hours of sunshine does Cape Coral have in September?

In Cape Coral, the average sunshine in September is 9.1h.

What is the month with the highest UV index in Cape Coral?

Months with the highest UV index in Cape Coral are May through September, with an average maximum UV index of 7.

What is the UV index intensity in September in Cape Coral?

In Cape Coral, the average daily maximum UV index in September is 7. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to the Sun's UV rays.
Average temperature in September - Cape Coral, FL
  • Average high temperature in September: 87.3°F

The warmest month (with the highest average high temperature) is August (88.9°F).
The month with the lowest average high temperature is January (70.7°F).

  • Average low temperature in September: 77.5°F

The month with the highest average low temperature is August (79.7°F).
The coldest month (with the lowest average low temperature) is January (57.7°F).

Average humidity in September - Cape Coral, FL
  • Average humidity in September: 76%

Months with the highest relative humidity are September and December (76%).
The month with the lowest relative humidity is March (71%).

Average rainfall in September - Cape Coral, FL
  • Average rainfall in September: 2.6"

The wettest month (with the highest rainfall) is August (3.94").
The driest months (with the least rainfall) are February and March (0.43").

Average rainfall days in September - Cape Coral, FL
  • Average rainfall days in September: 21.2 days

The month with the highest number of rainy days is August (24 days).
The month with the least rainy days is February (6.2 days).

Average sea temperature in September - Cape Coral, FL
  • Average sea temperature in September: 84.9°F

The best month for swimming (with the highest average sea temperature) is August (86.8°F).
The coldest month (with the lowest average sea temperature) is January (67°F).

Average daylight in September / Average sunshine in September - Cape Coral, FL
  • Average daylight in September: 12.3h

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

  • Average sunshine in September: 9.1h

The month with the most sunshine is July (Average sunshine: 11h).
The month with the least sunshine is December (Average sunshine: 6.6h).

Average UV index in September - Cape Coral, FL
  • Average UV index in September: 7

Months with the highest UV index are May, June, July, August and September (UV index 7).
The month with the lowest UV index is January (UV index 4).