August weather forecast
Key Largo, FL

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A clear seascape and cloudy evening sky in Key Largo, Florida
A clear seascape and cloudy evening sky in Key Largo, Florida

Weather in August

August brings about the height of the summer season, with warmer temperatures than July and extended daylight hours. Equilibrium between sun-soaked and rainy days provides a perfectly balanced tropical weather experience. Despite the intense sun, the sea temperature remains invitingly warm for all sorts of water sports. This is the month with the maximum cloud cover and the most significant atmospheric pressure dip, adding an interesting dynamic to the weather pattern. The highest recorded temperature reaches 85.5°F (29.7°C) in August, with an impressive rainfall amount of 4.33" (110mm).

Temperature

With its high average temperature of 85.5°F (29.7°C) and a low of 82.9°F (28.3°C), August is regarded as the warmest month.

Heat index

Throughout August, the heat index is estimated at a torrid 95°F (35°C). More safety actions are required, heat exhaustion and heat cramps are probable. Long-term activity may precipitate heatstroke.
Research indicates the heat index considers values in shaded locales and with light winds. Facing direct sunlight may hike up the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', determines the feeling of heat when you account for the relative humidity. One's weather perception can be influenced by a range of factors including metabolic differences, being pregnant, and their level of physical activity. Realize that direct exposure to sunlight can augment the felt heat, leading to a potential increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for children. Younglings are generally more in peril than adults due to their reduced perspiration. Coupled with a larger skin surface relative to their tiny bodies and greater heat production because of their activity, they become more at risk.
The physiological way the human body responds to excessive heat is by inducing perspiration, using sweat evaporation as a cooling mechanism. Increased relative humidity slows down evaporation, thereby decreasing the rate of heat removal from the body, culminating in a sensation of overheating. When heat uptake goes beyond the body's cooling mechanisms, there's a surge in body temperature, posing health risks.

Humidity

The average relative humidity in August is 74%.

Rainfall

The month with the most rainfall in Key Largo is August, when the rain falls for 20.9 days and typically aggregates up to 4.33" (110mm) of precipitation.

Ocean temperature

August is the month with the warmest seawater in Key Largo, with an average ocean temperature of 86.5°F (30.3°C).
Note: For a cooling respite, water temperatures above 86°F (30°C) might not be the first choice for many.

Daylight

The average length of the day in August is 12h and 59min.
On the first day of the month, sunrise is at 6:49 am and sunset at 8:06 pm. On the last day of August, sunrise is at 7:02 am and sunset at 7:41 pm EDT.

Sunshine

In Key Largo, the average sunshine in August is 10.2h.

UV index

The months with the highest UV index are April through October, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV rays for ordinary individuals.
Note: A maximum high UV index of 7 in August translates into the following recommendations:
Enforce precautions and stick to sun safety measures. Preservation from skin and eye damage is essential. The time between 10 a.m. and 4 p.m. is when UV radiation is at its peak. Limit exposure to direct sunlight during these hours. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit. Take warning! Reflective sand and water surfaces intensify the Sun's UV rays.
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Frequently asked questions

What is the hottest time of year in Key Largo?

August, with its high-temperature average of 85.5°F (29.7°C) and a low-temperature average of 82.9°F (28.3°C), is the warmest month.

Is it hot in Key Largo during August?

In Key Largo, 85.5°F (29.7°C) is the average high-temperature and 82.9°F (28.3°C) is the average low-temperature during August. In August, the average heat index (a.k.a. 'feels like', 'real feel'), which combines relative humidity and air temperature, is estimated at 95°F (35°C).

What is the average humidity in August in Key Largo?

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

What is the wettest month in Key Largo?

August is the month with the most rainfall in Key Largo. Rain falls for 20.9 days and accumulates 4.33" (110mm) of precipitation.

How much does it rain in Key Largo in August?

In Key Largo, Florida, in August, during 20.9 rainfall days, 4.33" (110mm) of precipitation is typically accumulated.

When is the ocean warmest in Key Largo?

The month with the warmest seawater in Key Largo is August, with an average ocean temperature of 86.5°F (30.3°C).

What is the ocean temperature in August in Key Largo?

In Key Largo, Florida, the average seawater temperature in August is 86.5°F (30.3°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 Key Largo?

The average day length in August in Key Largo is 12h and 59min.

When is the sunrise / sunset in August in Key Largo?

On the first day of August, sunrise is at 6:49 am and sunset at 8:06 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 7:41 pm EDT.

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

The average sunshine duration in August in Key Largo, Florida, is 10.2h.

When is the highest UV index in Key Largo?

April through October, with an average maximum UV index of 7, are months with the highest UV index.

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

The average daily maximum UV index in August in Key Largo, Florida, is 7. A UV Index reading of 6 to 7 represents a high hazard to health from exposure to Sun's UV rays.

Average temperature in August
Key Largo, FL

Average temperature in August - Key Largo, FL
  • Average high temperature in August: 85.5°F

The warmest month (with the highest average high temperature) is August (85.5°F).
The month with the lowest average high temperature is January (72.7°F).

  • Average low temperature in August: 82.9°F

The month with the highest average low temperature is August (82.9°F).
The coldest month (with the lowest average low temperature) is January (66.9°F).

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Average pressure in August
Key Largo, FL

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

The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are September and October (29.94"Hg).

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Average wind speed in August
Key Largo, FL

Average wind speed in August - Key Largo, FL
  • Average wind speed in August: 9.3mph

The windiest month (with the highest average wind speed) is January (12.9mph).
The calmest month (with the lowest average wind speed) is July (8.9mph).

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Average humidity in August
Key Largo, FL

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

The months with the highest relative humidity are February, June and December (76%).
The month with the lowest relative humidity is March (73%).

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Average rainfall in August
Key Largo, FL

Average rainfall in August - Key Largo, FL
  • Average rainfall in August: 4.33"

The wettest month (with the highest rainfall) is August (4.33").
The driest month (with the least rainfall) is March (0.59").

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Average rainfall days in August
Key Largo, FL

Average rainfall days in August - Key Largo, FL
  • Average rainfall days in August: 20.9 days

The month with the highest number of rainy days is September (22.9 days).
The month with the least rainy days is February (9.7 days).

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Average sea temperature in August
Key Largo, FL

Average sea temperature in August - Key Largo, FL
  • Average sea temperature in August: 86.5°F

The best month for swimming (with the highest average sea temperature) is August (86.5°F).
The coldest month (with the lowest average sea temperature) is February (74°F).

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

Average daylight in August / Average sunshine in August - Key Largo, FL
  • Average daylight in August: 13h and 0min

The month with the longest days is June (Average daylight: 13h and 42min).
The month with the shortest days is December (Average daylight: 10h and 36min).

  • Average sunshine in August: 10h and 1min

The month with the most sunshine is July (Average sunshine: 11h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 24min).

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Average sunshine days in August
Key Largo, FL

Average sunshine days in August - Key Largo, FL
  • Average sunshine days in August: 7.8 days

The month with the most sunshine days is January (17.3 days).
The month with the least sunshine days is September (5.2 days).

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Average UV index in August
Key Largo, FL

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

The months with the highest UV index are April, May, June, July, August, September and October (UV index 7).
The month with the lowest UV index is January (UV index 5).

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Average cloud cover in August
Key Largo, FL

Average cloud cover in August - Key Largo, FL
  • Average cloud cover in August: 30

The month with the most cloud cover is October (Cloud cover 35).
The month with the least cloud cover is April (Cloud cover 26).

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Average visibility in August
Key Largo, FL

Average visibility in August - Key Largo, 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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Key Largo, Florida, USA

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