August weather forecast and climate
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 average temperature fluctuating between 82.9°F (28.3°C) and 85.5°F (29.7°C).

Temperature

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

Heat index

The average heat index in August is appraised at a torrid 95.4°F (35.2°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'feels like', 'apparent temperature', or 'real feel', combines air temperature and relative humidity to represent a human perceived temperature equivalent. Additional factors like metabolic differences, clothing, pregnancy, and activity influence one's weather impression. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, 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 normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. With a lot of moisture in the air, the evaporation process is not as effective, and the body does not cool down as efficiently, creating a perception of overheating. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

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

Rainfall

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

Ocean temperature

With an average ocean temperature of 86.5°F (30.3°C), August is the month with the warmest seawater in Key Largo.
Note: For swimming, other intense water activities, temperature above 86°F (30°C) is arguably unpleasant, as the water cooling effect is missing.

Daylight

In August, the average length of the day is 13h.

Sunshine

In Key Largo, the average sunshine is 10.2h.

UV index

Months with the highest UV index are April through October, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high threat to health from the exposure to the Sun's UV rays for the ordinary person.
Note: In August, 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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.
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FAQ

What is the warmest month in Key Largo?

The warmest month in Key Largo is August, 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?

In August, in Key Largo, Florida, the average high-temperature is 85.5°F (29.7°C), and the average low-temperature is 82.9°F (28.3°C). In August, the average heat index (a.k.a. 'feels like', 'apparent temperature'), that factores the actual air temperature with the relative humidity, is calculated to 95.4°F (35.2°C).

What is the average humidity in August in Key Largo?

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

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

In August, in Key Largo, Florida, the rain falls for 20.9 days. Throughout August, 4.33" (110mm) of precipitation is accumulated.

What is the rainiest month in Key Largo?

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

What month is the ocean warmest in Key Largo?

The month with the warmest seawater in Key Largo, Florida, 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 August, the average ocean temperature in Key Largo 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 length of the day in August in Key Largo, Florida, is 13h.

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

The average sunshine 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 in Key Largo.

What is the UV index intensity in August in Key Largo?

In August, the average daily maximum UV index in Key Largo is 7. A UV Index estimate of 6 to 7 represents a high health risk from unsafe exposure to the 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"

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

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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%

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

The month with the longest days is June (Average daylight: 13.7h).
The month with the shortest days is December (Average daylight: 10.6h).

  • Average sunshine in August: 10.2h

The month with the most sunshine is July (Average sunshine: 11h).
The month with the least sunshine is December (Average sunshine: 6.4h).

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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

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

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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