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

Key Largo ushers in the onset of summer in May, with a conspicuous heat influence compared to April. The sunshine hours plateau, giving way to longer daylight hours, resulting in predominantly sunny days. In consonance with the season, the sea temperature rises, further promoting water-based activities. Despite the high heat, May witnesses the start of the rainy season, with occasional showers predicted. This month's temperature soars to a high of 80.6°F (27°C) and rainfall amounts to 2.64" (67mm).

Temperature

The arrival of May is marked by an average high-temperature of a still moderately hot 80.6°F (27°C), bearing a close resemblance to April. The temperature during May sees a subtle transition from day to night, averaging a low of 78.1°F (25.6°C).

Heat index

In May, the average heat index is estimated at 84.2°F (29°C). Remaining active during long-lasting exposure could cause fatigue, leading to heat cramps.
Consider that heat index readings are for situations in the shade and light wind. Exposure to unobstructed sunshine could lead to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is a fusion of air temperature and moisture levels to demonstrate the sensation of heat. The influence of weather is personal, with varied individuals experiencing it differently due to differences in body mass, stature, and physical exertion levels. Should you be directly under the sun, anticipate a possible increase in the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Young kids are often more at risk than adults as they tend to perspire less. Besides, their skin surface is larger relative to their small bodies, and their increased heat output from their active lifestyle compounds their risk.

Humidity

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

Rainfall

In Key Largo, in May, it is raining for 15.3 days, with typically 2.64" (67mm) of accumulated 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 May, the average ocean temperature is 81.1°F (27.3°C).
Note: For engaging in any water activities, temperatures from 77°F (25°C) to 84.2°F (29°C) are viewed as outstanding and exceptionally pleasing for prolonged durations.

Daylight

In Key Largo, the average length of the day in May is 13h and 22min.
On the first day of the month, sunrise is at 6:45 am and sunset at 7:52 pm. On the last day of May, sunrise is at 6:31 am and sunset at 8:07 pm EDT.

Sunshine

The average sunshine in May is 10.6h.

UV index

The months with the highest UV index are April through October, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: In May, a daily maximum UV index of 7 leads to the following instructions:
Guard oneself from overexposure. Defence against sun injury is vital. UV radiation from the sun is at its strongest between 10 a.m. and 4 p.m. Try to limit direct exposure during these hours. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Be attentive! The UV exposure is heightened with reflections from sand and water.
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Frequently asked questions

What is the average May temperature in Key Largo?

The average high-temperature, in May, in Key Largo, is 80.6°F (27°C), while the average low-temperature is 78.1°F (25.6°C). In May, the average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which combines relative humidity and air temperature, is estimated at 84.2°F (29°C).

What is the average humidity in May in Key Largo?

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

How much does it rain in Key Largo in May?

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

How warm is the water in May in Key Largo?

In Key Largo, the average seawater temperature in May is 81.1°F (27.3°C). 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.

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

The average day length in May in Key Largo is 13h and 22min.

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

On the first day of May in Key Largo, sunrise is at 6:45 am and sunset at 7:52 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 Key Largo, Florida, the average sunshine duration 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.

What is the UV index reading in May in Key Largo?

The average daily maximum UV index in May is 7. A UV Index reading of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

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 2min

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 May: 10h and 4min

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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Key Largo, Florida, USA

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