August weather forecast
Key Largo, FL

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

The last month of the summer, August, is another warm month in Key Largo, Florida, with temperature in the range of an average high of 85.5°F (29.7°C) and an average low of 82.9°F (28.3°C).

Temperature

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

Heat index

The average heat index in August is estimated at a torrid 95°F (35°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. 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', 'felt air temperature', or 'real feel', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. Additional factors like activity, clothing, differences in body mass, height, and shape, and pregnancy affect individual temperature impact. 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 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.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

The average relative humidity in August in Key Largo is 74%.

Rainfall

August is the month with the most rainfall in Key Largo. Rain falls for 20.9 days and accumulates 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: 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 is 12h and 59min.
On the first day of the month, sunrise is at 6:49 am and sunset at 8:07 pm. On the last day of August, in Key Largo, sunrise is at 7:02 am and sunset at 7:42 pm EDT.

Sunshine

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

UV index

The months with the highest UV index in Key Largo are April through October, 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 ordinary person.
Note: The daily maximum UV index of 7 in August interpret into the following advice:
Take precautions against overexposure. Protection against sun damage is needed. 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. 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 Key Largo?

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

What is the temperature in August in Key Largo?

The average high-temperature, in August, in Key Largo, is 85.5°F (29.7°C), while the average low-temperature is 82.9°F (28.3°C). in August, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), 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, Florida, the average relative humidity in August is 74%.

What is the wettest month in Key Largo?

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

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

In Key Largo, Florida, during August, the rain falls for 20.9 days and regularly aggregates up to 4.33" (110mm) of precipitation.

What is the month with the warmest ocean in Key Largo?

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

What is the ocean temperature in August in Key Largo?

In Key Largo, in August, the average water temperature is 86.5°F (30.3°C). For swimming, other intense water activities, temperature above 86°F (30°C) is arguably unpleasant, as the water cooling effect is missing.

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

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

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

In August, on the first day of the month, sunrise is at 6:49 am and sunset at 8:07 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 7:42 pm EDT.

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

The average sunshine duration in August is 10.2h.

What is the month with 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 in Key Largo.

What is the UV index reading 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 health risk 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: 12h and 59min

The month with the longest days is June (Average daylight: 13h and 40min).
The month with the shortest days is December (Average daylight: 10h and 37min).

  • Average sunshine in August: 10h and 12min

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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