September weather forecast and climate
Gandy, FL

Weather in September

September, the first month of the autumn, in Gandy, 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 87.1°F (30.6°C).

Temperature

In September, the average high-temperature is almost the same as in August - a still tropical 87.1°F (30.6°C). In September, the average low-temperature is 77.5°F (25.3°C).

Heat index

In September, the average heat index is computed to be a sweltering 99.9°F (37.7°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With 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 'feels like', 'felt air temperature', 'apparent temperature', or 'real feel', combines air temperature and relative humidity to represent a human perceived temperature equivalent. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (metabolic differences, pregnancy, wind). Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. With a lot of moisture in the air, the evaporation process is not as effective, and the body does not cool down as efficiently, creating a perception of overheating. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

In Gandy, the average relative humidity is 74%.

Rainfall

In Gandy, during 20 rainfall days, 2.8" (71mm) of precipitation is typically accumulated. Throughout the year, there are 161.7 rainfall days, and 24.76" (629mm) of precipitation is accumulated.

Ocean temperature

In Gandy, the average seawater temperature in September is 84.7°F (29.3°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

The average length of the day in Gandy is 12.3h.

Sunshine

In September, the average sunshine in Gandy is 9.2h.

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 the exposure to the Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 7 in September interpret into the following advice:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. 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. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in September in Gandy?

In Gandy, Florida, in September, the average high-temperature is 87.1°F (30.6°C), and the average low-temperature is 77.5°F (25.3°C). In September, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which combines relative humidity and air temperature, is computed to be 99.9°F (37.7°C).

What is the average humidity in September in Gandy?

In Gandy, Florida, the average relative humidity in September is 74%.

How much does it rain in Gandy in September?

In September, in Gandy, the rain falls for 20 days. Throughout September, 2.8" (71mm) of precipitation is accumulated.

How warm is the water in September in Gandy?

In Gandy, Florida, the average seawater temperature in September is 84.7°F (29.3°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 Gandy have in September?

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

How many hours of sunshine does Gandy have in September?

In Gandy, Florida, the average sunshine in September is 9.2h.

When is the highest UV index in Gandy?

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

What is the UV index reading in September in Gandy?

In September, the average daily maximum UV index is 7. A UV Index reading of 6 to 7 represents a high health threat from the exposure to the Sun's UV rays.

Average temperature in September
Gandy, FL

Average temperature in September - Gandy, FL
  • Average high temperature in September: 87.1°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 (66.7°F).

  • Average low temperature in September: 77.5°F

The month with the highest average low temperature is August (80.4°F).
The coldest month (with the lowest average low temperature) is January (55.2°F).

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Average pressure in September
Gandy, FL

Average pressure in September - Gandy, FL
  • Average pressure in September: 29.96"

The month with the highest atmospheric pressure is January (30.14").
The month with the lowest atmospheric pressure is September (29.96").

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Average wind speed in September
Gandy, FL

Average wind speed in September - Gandy, FL
  • Average wind speed in September: 7.3mph

The windiest month (with the highest average wind speed) is January (9.2mph).
The calmest month (with the lowest average wind speed) is July (6.6mph).

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Average humidity in September
Gandy, FL

Average humidity in September - Gandy, FL
  • Average humidity in September: 74%

The month with the highest relative humidity is December (76%).
The month with the lowest relative humidity is May (71%).

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Average rainfall in September
Gandy, FL

Average rainfall in September - Gandy, FL
  • Average rainfall in September: 2.8"

The wettest month (with the highest rainfall) is July (4.61").
The driest month (with the least rainfall) is November (0.83").

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Average rainfall days in September
Gandy, FL

Average rainfall days in September - Gandy, FL
  • Average rainfall days in September: 20 days

The month with the highest number of rainy days is July (24.3 days).
The month with the least rainy days is November (7.2 days).

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Average sea temperature in September
Gandy, FL

Average sea temperature in September - Gandy, FL
  • Average sea temperature in September: 84.7°F

The best month for swimming (with the highest average sea temperature) is August (86.7°F).
The coldest month (with the lowest average sea temperature) is January (64°F).

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Average daylight in September /
Average sunshine in September
Gandy, FL

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

The month with the longest days is June (Average daylight: 13.9h).
The month with the shortest days is December (Average daylight: 10.4h).

  • Average sunshine in September: 9.2h

The month with the most sunshine is May (Average sunshine: 11.2h).
The month with the least sunshine is December (Average sunshine: 6.5h).

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Average sunshine days in September
Gandy, FL

Average sunshine days in September - Gandy, FL
  • Average sunshine days in September: 7.5 days

The month with the most sunshine days is January (22.6 days).
The month with the least sunshine days is July (4.3 days).

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Average UV index in September
Gandy, FL

Average UV index in September - Gandy, 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).

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Average cloud cover in September
Gandy, FL

Average cloud cover in September - Gandy, FL
  • Average cloud cover in September: 27

Months with the most cloud cover are January and December (Cloud cover 30).
The month with the least cloud cover is May (Cloud cover 21).

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Average visibility in September
Gandy, FL

Average visibility in September - Gandy, FL
  • Average visibility in September: 6mi

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

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