August weather forecast
Siesta Key, FL

Weather in August

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

Temperature

The warmest month is August, with an average high-temperature of 88.5°F (31.4°C) and an average low-temperature of 79.7°F (26.5°C).

Heat index

In August, the average heat index is computed to be a scorching 104°F (40°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Note that heat index values are valued for light wind and location in the shade. 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 'apparent temperature', 'felt air temperature', 'real feel', or 'feels like', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. This effect is individual, with diverse people perceiving weather differently for numerous reasons (clothing, wind, metabolic differences), and activity. 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 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.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. 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

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

Rainfall

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

Ocean temperature

With an average ocean temperature of 86.7°F (30.4°C), August is the month with the warmest seawater in Siesta Key.
Note: 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.

Daylight

The average length of the day in August in Siesta Key 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, sunrise is at 7:08 am and sunset at 7:51 pm EDT.

Sunshine

In August, the average sunshine 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 value of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: In August, the average maximum UV index of 7 translate into the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. 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.
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FAQ

What is the warmest month in Siesta Key?

August is the warmest month in Siesta Key, with an average high-temperature of 88.5°F (31.4°C) and an average low-temperature of 79.7°F (26.5°C).

What is the temperature in August in Siesta Key?

In August, in Siesta Key, Florida, the average high-temperature is 88.5°F (31.4°C), and the average low-temperature is 79.7°F (26.5°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which calculates the temperature value influenced by the moisture in the air, in August is computed to be 104°F (40°C).

What is the average humidity in August in Siesta Key?

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

What is the wettest month in Siesta Key?

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

How many days does it rain in August in Siesta Key?

In Siesta Key, Florida, in August, it is raining for 26.8 days, with typically 6.42" (163mm) of accumulated precipitation.

When is the ocean warmest in Siesta Key?

With an average ocean temperature of 86.7°F (30.4°C), August is the month with the warmest seawater in Siesta Key, Florida.

How warm is the water in August in Siesta Key?

In Siesta Key, the average seawater temperature in August is 86.7°F (30.4°C). The water temperature above 86°F (30°C) is arguably regarded as unpleasant. The primary purpose of entering the water - cooling down from sunshine and high temperatures - is lost.

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

In Siesta Key, Florida, the average day length in August is 13h and 5min.

What time 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, in Siesta Key, Florida, sunrise is at 7:08 am and sunset at 7:51 pm EDT.

How long on average sun shines in August in Siesta Key?

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

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

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

How high is the UV index in August in Siesta Key?

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

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 5min

The month with the longest days is June (Average daylight: 13h and 50min).
The month with the shortest days is December (Average daylight: 10h and 28min).

  • Average sunshine in August: 9h and 36min

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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