August weather forecast
Siesta Key, FL

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Weather in August

The last month of the summer, August, is another hot month in Siesta Key, Florida, with an average temperature fluctuating between 79.7°F (26.5°C) and 88.5°F (31.4°C).

Temperature

August, with its average high-temperature of 88.5°F (31.4°C) and an average low-temperature of 79.7°F (26.5°C), holds the record as the warmest month.

Heat index

August's average heat index is evaluated at a blisteringly hot 104°F (40°C). Heightened safety actions are necessary, heat cramps and heat exhaustion are probable. Persistent activity may lead to heatstroke.
It is emphasized that the heat index's values are meant for shaded zones with mild winds. Exposure to direct sunlight may make the heat index values climb by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', is an estimation of the warmth sensation when considering humidity levels. One's perception of temperature is subjective, varying based on their activity and individual heat perception, influenced by factors like wind, clothing, and metabolic variations. In the direct sunlight, the weather's impact can be amplified, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Young ones generally face higher dangers than adults since they sweat less. Along with their large skin surface area compared totheir small bodies and increased heat production from their activities, the risks are heightened.
Sweat evaporation, driven by perspiration, is the method the human body uses to rid itself of excessive warmth. Elevated relative humidity diminishes evaporation, thereby reducing the body's ability to shed heat and creating a feeling of being too warm. 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

The average relative humidity in August is 74%.

Rainfall

August is the month with the most rainfall in Siesta Key. Rain falls for 26.8 days and accumulates 6.42" (163mm) of precipitation.

Ocean temperature

The month with the warmest seawater is August, with an average ocean temperature of 86.7°F (30.4°C).
Note: The allure of a refreshing swim can be decreased in waters that exceed 86°F (30°C).

Daylight

In August, the average length of the day is 13h and 5min.
On the first day of the month, sunrise is at 6:54 am and sunset at 8:18 pm. On the last day of August, in Siesta Key, Florida, sunrise is at 7:09 am and sunset at 7:51 pm EDT.

Sunshine

In Siesta Key, Florida, the average sunshine in August is 9.6h.

UV index

The months with the highest UV index are May through September, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health risk from unsafe exposure to UV radiation for average individuals.
Note: In August, the maximum UV index of 7 suggests this advice:
Eschew overexposure. Those with light skin may suffer burns in fewer than 20 minutes. Seek shade and limit direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Keep in mind that shade structures like parasols or canopies do not offer complete sun protection. Employ a wide-brim hat for potent defense against up to 50% of UV rays. Be alert! The reflection of water and sand augments UV radiation intensity.
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Frequently asked questions

What month is the hottest in Siesta Key?

Siesta Key, Florida, witnesses the warmest weather in August, with temperatures averaging a high of 88.5°F (31.4°C) and a low of 79.7°F (26.5°C).

How hot is August in Siesta Key?

The average high-temperature and low-temperature in Siesta Key during August are 88.5°F (31.4°C) and 79.7°F (26.5°C) respectively. In August, the average heat index (a.k.a. 'feels like', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, is evaluated at 104°F (40°C).

What is the average humidity in August in Siesta Key?

In August, the average relative humidity in Siesta Key, Florida, is 74%.

What is the wettest month in Siesta Key?

The month with the most rainfall in Siesta Key is August, when the rain falls for 26.8 days and typically aggregates up to 6.42" (163mm) of precipitation.

How much does it rain in Siesta Key in August?

In Siesta Key, in August, during 26.8 rainfall days, 6.42" (163mm) of precipitation is typically accumulated.

When is the ocean warmest in Siesta Key?

The month with the warmest seawater is August, with an average ocean temperature of 86.7°F (30.4°C).

What is the ocean temperature in August in Siesta Key?

In Siesta Key, the average seawater temperature in August is 86.7°F (30.4°C). The surface water temperatures above 86°F (30°C) are arguably considered as unpleasant for swimming, and any intense water activity, as the refreshing effect of water is missing.

What is the average length of the day in August in Siesta Key?

The average day length in August is 13h and 5min.

When are sunrise and sunset in August in Siesta Key?

In August, on the first day of the month, sunrise is at 6:54 am and sunset at 8:18 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 7:51 pm EDT.

How many hours of sunshine does Siesta Key have in August?

In Siesta Key, the average sunshine duration in August is 9.6h.

What are the months with the highest UV index in Siesta Key?

The months with the highest UV index are May through September, with an average maximum UV index of 7.

What is the UV index reading in August in Siesta Key?

In August, the average daily maximum UV index in Siesta Key is 7. A UV Index of 6 to 7 symbolizes a high health threat from exposure to the Sun's UV radiation.

Average temperature in August
Siesta Key, FL

Average temperature in August - Siesta Key, FL
  • Average high temperature in August: 88.5°F

The warmest month (with the highest average high temperature) is August (88.5°F).
The month with the lowest average high temperature is January (68.5°F).

  • Average low temperature in August: 79.7°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 (56.1°F).

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Average pressure in August
Siesta Key, FL

Average pressure in August - Siesta Key, FL
  • Average pressure in August: 29.98"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is September (29.95"Hg).

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Average wind speed in August
Siesta Key, FL

Average wind speed in August - Siesta Key, FL
  • Average wind speed in August: 6.7mph

The windiest month (with the highest average wind speed) is January (9.3mph).
The calmest month (with the lowest average wind speed) is July (6.4mph).

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Average humidity in August
Siesta Key, FL

Average humidity in August - Siesta Key, FL
  • Average humidity in August: 74%

The month with the highest relative humidity is December (76%).
The months with the lowest relative humidity are March, April and May (72%).

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Average rainfall in August
Siesta Key, FL

Average rainfall in August - Siesta Key, FL
  • Average rainfall in August: 6.42"

The wettest month (with the highest rainfall) is August (6.42").
The driest months (with the least rainfall) are February and November (1.06").

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Average rainfall days in August
Siesta Key, FL

Average rainfall days in August - Siesta Key, FL
  • Average rainfall days in August: 26.8 days

The month with the highest number of rainy days is August (26.8 days).
The months with the least rainy days are January, February and November (8.3 days).

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Average sea temperature in August
Siesta Key, FL

Average sea temperature in August - Siesta Key, FL
  • Average sea temperature in August: 86.7°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 (64.1°F).

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Average daylight in August /
Average sunshine in August
Siesta Key, FL

Average daylight in August / Average sunshine in August - Siesta Key, FL
  • Average daylight in August: 13h and 1min

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 August: 9h and 4min

The month with the most sunshine is May (Average sunshine: 11h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 30min).

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Average sunshine days in August
Siesta Key, FL

Average sunshine days in August - Siesta Key, FL
  • Average sunshine days in August: 2.5 days

The month with the most sunshine days is January (21.1 days).
The month with the least sunshine days is August (2.5 days).

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Average UV index in August
Siesta Key, FL

Average UV index in August - Siesta Key, FL
  • Average UV index in August: 7

The 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 August
Siesta Key, FL

Average cloud cover in August - Siesta Key, FL
  • Average cloud cover in August: 27

The months with the most cloud cover are January and December (Cloud cover 30).
The month with the least cloud cover is May (Cloud cover 22).

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Average visibility in August
Siesta Key, FL

Average visibility in August - Siesta Key, FL
  • Average visibility in August: 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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Siesta Key, Florida, USA

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