May 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 May

May, the last month of the spring, in Key Largo, is also a moderately hot month, with average temperature ranging between max 80.6°F (27°C) and min 78.1°F (25.6°C).

Temperature

In May, the average high-temperature is relatively the same as in April - a still moderately hot 80.6°F (27°C). In May, in Key Largo, the average low-temperature is 78.1°F (25.6°C).

Heat index

The average heat index is calculated to 84.7°F (29.3°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
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 'apparent temperature', 'feels like', 'felt air temperature', or 'real feel', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (differences in body mass, height, and shape, clothing, pregnancy). 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. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

In Key Largo, the average relative humidity is 75%.

Rainfall

In Key Largo, during May, the rain falls for 15.3 days and regularly aggregates up to 2.64" (67mm) of precipitation. In Key Largo, during the entire year, the rain falls for 190.1 days and collects up to 27.05" (687mm) of precipitation.

Ocean temperature

In Key Largo, in May, the average water temperature is 81.1°F (27.3°C).
Note: For swimming, diving, and other water activities, temperatures between 77°F (25°C) and 84.2°F (29°C) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

Daylight

In Key Largo, the average length of the day in May is 13.4h.

Sunshine

In May, the average sunshine in Key Largo is 10.6h.

UV index

April through October, with an average maximum UV index of 7, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high health risk from unsafe exposure to the UV radiation for the ordinary person.
Note: In May, 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. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.
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FAQ

What is the temperature in May in Key Largo?

The average high-temperature, in May, in Key Largo, Florida, is 80.6°F (27°C), while the average low-temperature is 78.1°F (25.6°C). The average heat index (a.k.a. 'felt air temperature', 'feels like'), that represents influence of the relative humidity to air temperaure, in May is estimated at 84.7°F (29.3°C).

What is the average humidity in May in Key Largo?

In May, the average relative humidity is 75%.

How much does it rain in Key Largo in May?

In May, in Key Largo, Florida, the rain falls for 15.3 days. Throughout May, 2.64" (67mm) of precipitation is accumulated.

What is the water temperature in May in Key Largo?

In May, the average ocean temperature in Key Largo, Florida, is 81.1°F (27.3°C). For swimming, diving, and other water activities, temperatures between 77°F (25°C) and 84.2°F (29°C) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

How many hours of daylight does Key Largo have in May?

The average length of the day in May in Key Largo, Florida, is 13.4h.

How many hours of sunshine does Key Largo have in May?

In Key Largo, Florida, the average sunshine in May is 10.6h.

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.

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

The average daily maximum UV index in May in Key Largo is 7. A UV Index reading of 6 to 7 represents a high health threat from unprotected exposure to the UV radiation.

Average temperature in May
Key Largo, FL

Average temperature in May - Key Largo, FL
  • Average high temperature in May: 80.6°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 May: 78.1°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 May
Key Largo, FL

Average pressure in May - Key Largo, FL
  • Average pressure in May: 30"

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 May
Key Largo, FL

Average wind speed in May - Key Largo, FL
  • Average wind speed in May: 11.6mph

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 May
Key Largo, FL

Average humidity in May - Key Largo, FL
  • Average humidity in May: 75%

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 May
Key Largo, FL

Average rainfall in May - Key Largo, FL
  • Average rainfall in May: 2.64"

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 May
Key Largo, FL

Average rainfall days in May - Key Largo, FL
  • Average rainfall days in May: 15.3 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 May
Key Largo, FL

Average sea temperature in May - Key Largo, FL
  • Average sea temperature in May: 81.1°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 May /
Average sunshine in May
Key Largo, FL

Average daylight in May / Average sunshine in May - Key Largo, FL
  • Average daylight in May: 13.4h

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 May: 10.6h

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 May
Key Largo, FL

Average sunshine days in May - Key Largo, FL
  • Average sunshine days in May: 13 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 May
Key Largo, FL

Average UV index in May - Key Largo, FL
  • Average UV index in May: 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 May
Key Largo, FL

Average cloud cover in May - Key Largo, FL
  • Average cloud cover in May: 29

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 May
Key Largo, FL

Average visibility in May - Key Largo, FL
  • Average visibility in May: 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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