September weather forecast and climate
Harbor Bluffs, FL

Weather in September

September, the first month of the autumn, in Harbor Bluffs, is still a hot month, with temperature in the range of an average low of 77.9°F (25.5°C) and an average high of 86.2°F (30.1°C).

Temperature

In Harbor Bluffs, the average high-temperature in September is practically the same as in August - a still tropical 86.2°F (30.1°C). In September, in Harbor Bluffs, the average low-temperature is 77.9°F (25.5°C).

Heat index

The average heat index is calculated to a very hot 97.3°F (36.3°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'apparent temperature', 'real feel', or 'felt air temperature', 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, differences in body mass, height, and shape, wind). Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. 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.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

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

Rainfall

In Harbor Bluffs, during September, the rain falls for 20.7 days and regularly aggregates up to 2.17" (55mm) of precipitation. In Harbor Bluffs, Florida, during the entire year, the rain falls for 149.9 days and collects up to 16.18" (411mm) of precipitation.

Ocean temperature

In September, the average ocean temperature 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

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

Sunshine

The average sunshine in Harbor Bluffs is 9.1h.

UV index

May through September, with an average maximum UV index of 7, are months with the highest UV index in Harbor Bluffs. A UV Index reading of 6 to 7 represents a high health vulnerability from unsafe exposure to the UV radiation for ordinary individuals.
Note: In September, the average maximum UV index of 7 translate into the following recommendations:
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. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.
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FAQ

What is the temperature in September in Harbor Bluffs?

In September, the average high-temperature is 86.2°F (30.1°C), and the average low-temperature is 77.9°F (25.5°C). In September, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), that represents influence of the relative humidity to air temperaure, is appraised at 97.3°F (36.3°C).

What is the average humidity in September in Harbor Bluffs?

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

How much does it rain in Harbor Bluffs in September?

In Harbor Bluffs, in September, during 20.7 rainfall days, 2.17" (55mm) of precipitation is typically accumulated.

What is the ocean temperature in September in Harbor Bluffs?

In Harbor Bluffs, 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.

What is the average length of the day in September in Harbor Bluffs?

In Harbor Bluffs, Florida, the average length of the day in September is 12.3h.

How many hours of sunshine does Harbor Bluffs have in September?

In September, the average sunshine in Harbor Bluffs is 9.1h.

What are the months with the highest UV index in Harbor Bluffs?

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

What is the UV index reading in September in Harbor Bluffs?

The average daily maximum UV index in September in Harbor Bluffs is 7. A UV Index reading of 6 to 7 represents a high health threat from the exposure to the Sun's UV radiation.

Average temperature in September
Harbor Bluffs, FL

Average temperature in September - Harbor Bluffs, FL
  • Average high temperature in September: 86.2°F

The warmest month (with the highest average high temperature) is August (87.6°F).
The month with the lowest average high temperature is January (65.8°F).

  • Average low temperature in September: 77.9°F

The month with the highest average low temperature is August (80.6°F).
The coldest month (with the lowest average low temperature) is January (55.9°F).

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Average pressure in September
Harbor Bluffs, FL

Average pressure in September - Harbor Bluffs, 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
Harbor Bluffs, FL

Average wind speed in September - Harbor Bluffs, FL
  • Average wind speed in September: 8mph

The windiest months (with the highest average wind speed) are January and March (9.8mph).
The calmest month (with the lowest average wind speed) is July (7.1mph).

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Average humidity in September
Harbor Bluffs, FL

Average humidity in September - Harbor Bluffs, FL
  • Average humidity in September: 74%

The month with the highest relative humidity is December (77%).
The month with the lowest relative humidity is October (72%).

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Average rainfall in September
Harbor Bluffs, FL

Average rainfall in September - Harbor Bluffs, FL
  • Average rainfall in September: 2.17"

The wettest month (with the highest rainfall) is August (3.07").
The driest month (with the least rainfall) is March (0.39").

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Average rainfall days in September
Harbor Bluffs, FL

Average rainfall days in September - Harbor Bluffs, FL
  • Average rainfall days in September: 20.7 days

The month with the highest number of rainy days is August (22.7 days).
The month with the least rainy days is February (6.7 days).

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Average sea temperature in September
Harbor Bluffs, FL

Average sea temperature in September - Harbor Bluffs, 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
Harbor Bluffs, FL

Average daylight in September / Average sunshine in September - Harbor Bluffs, 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: 9.1h

The month with the most sunshine is May (Average sunshine: 11.3h).
The month with the least sunshine is December (Average sunshine: 6.5h).

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Average sunshine days in September
Harbor Bluffs, FL

Average sunshine days in September - Harbor Bluffs, FL
  • Average sunshine days in September: 5.5 days

The month with the most sunshine days is January (22.8 days).
The month with the least sunshine days is August (5 days).

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Average UV index in September
Harbor Bluffs, FL

Average UV index in September - Harbor Bluffs, 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
Harbor Bluffs, FL

Average cloud cover in September - Harbor Bluffs, FL
  • Average cloud cover in September: 26

Months with the most cloud cover are January and December (Cloud cover 30).
The month with the least cloud cover is May (Cloud cover 20).

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Average visibility in September
Harbor Bluffs, FL

Average visibility in September - Harbor Bluffs, 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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