May 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 May

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

Temperature

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

Heat index

The average heat index in May is estimated at 84.2°F (29°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
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 'feels like', 'felt air temperature', 'real feel', or 'apparent temperature', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (metabolic differences, wind, 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 in May 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, Florida, 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, the average seawater temperature in May is 81.1°F (27.3°C).
Note: For any water activity, surface water temperatures between 77°F (25°C) and 84.2°F (29°C) are considered as excellent and extremely pleasant for lengthened periods.

Daylight

The average length of the day in May in Key Largo, Florida, is 13h and 22min.
On the first day of the month, sunrise is at 6:45 am and sunset at 7:51 pm. On the last day of May, in Key Largo, Florida, sunrise is at 6:31 am and sunset at 8:07 pm EDT.

Sunshine

In May, the average sunshine 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 of 6 to 7 symbolizes a high health risk from unsafe exposure to UV radiation for average individuals.
Note: In May, the average maximum UV index of 7 translate into the following recommendations:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. 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. 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. 'feels like', 'real feel'), which calculates the temperature value influenced by the moisture in the air, in May is estimated at 84.2°F (29°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.

How warm is the water in May in Key Largo?

In Key Largo, Florida, the average seawater temperature in May 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?

In May, the average day length in Key Largo, Florida, is 13h and 22min.

What time are sunrise and sunset in May in Key Largo?

On the first day of May, sunrise is at 6:45 am and sunset at 7:51 pm. On the last day of the month, sunrise is at 6:31 am and sunset at 8:07 pm EDT.

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

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

What are the months 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.

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

In Key Largo, the average daily maximum UV index in May is 7. A UV Index estimate of 6 to 7 represents a high health threat from unsafe exposure to Sun's UV rays.
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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"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 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%

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 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: 13h and 22min

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 May: 10h and 36min

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 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

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 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

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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