May weather forecast
Key West, FL

A beach pier in Key West, Florida, with palm trees in the background
A beach pier in Key West, Florida, with palm trees in the background

Weather in May

The last month of the spring, May, is another warm month in Key West, Florida, with an average temperature ranging between max 80.2°F (26.8°C) and min 77.9°F (25.5°C).

Temperature

In Key West, the average high-temperature in May is relatively the same as in April - a still moderately hot 80.2°F (26.8°C). In May, the average low-temperature is 77.9°F (25.5°C).

Humidity

The average relative humidity in May in Key West, Florida, is 77%.

Rainfall

In Key West, Florida, in May, during 16.5 rainfall days, 3.5" (89mm) of precipitation is typically accumulated. Throughout the year, there are 199.2 rainfall days, and 31.61" (803mm) of precipitation is accumulated.

Ocean temperature

In Key West, Florida, in May, the average water temperature is 80.8°F (27.1°C).
Note: Water temperature between 77°F (25°C) and 84.2°F (29°C) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

Daylight

The average length of the day in May in Key West is 13h and 20min.
On the first day of May in Key West, sunrise is at 6:51 am and sunset at 7:56 pm. On the last day of the month, sunrise is at 6:38 am and sunset at 8:11 pm EDT.

Sunshine

The average sunshine in May in Key West is 10.9h.

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 risk from exposure to the Sun's UV radiation for the ordinary person.
Note: The daily maximum UV index of 7 in May interpret into the following advice:
Take precautions against overexposure. Protection against sun damage is needed. 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. 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 average humidity in May in Key West?

In May, the average relative humidity in Key West is 77%.

How much does it rain in Key West in May?

In Key West, during May, the rain falls for 16.5 days and regularly aggregates up to 3.5" (89mm) of precipitation.

How warm is the water in May in Key West?

In May, the average ocean temperature is 80.8°F (27.1°C). Water temperature between 77°F (25°C) and 84.2°F (29°C) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

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

In May, the average day length in Key West is 13h and 20min.

When are sunrise and sunset in May in Key West?

On the first day of May, sunrise is at 6:51 am and sunset at 7:56 pm. On the last day of the month, sunrise is at 6:38 am and sunset at 8:11 pm EDT.

How long on average sun shines in May in Key West?

In Key West, Florida, the average sunshine duration in May is 10.9h.

What is the month with the highest UV index in Key West?

The months with the highest UV index are April through October, with an average maximum UV index of 7.

What is the UV index intensity in May in Key West?

In May, the average daily maximum UV index in Key West, Florida, is 7. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to Sun's UV rays.

Average temperature in May
Key West, FL

Average temperature in May - Key West, FL
  • Average high temperature in May: 80.2°F

The warmest month (with the highest average high temperature) is August (85.3°F).
The month with the lowest average high temperature is January (72.7°F).

  • Average low temperature in May: 77.9°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 (68.5°F).

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Average pressure in May
Key West, FL

Average pressure in May - Key West, FL
  • Average pressure in May: 29.99"

The month with the highest atmospheric pressure is January (30.09").
The months with the lowest atmospheric pressure are September and October (29.93").

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Average wind speed in May
Key West, FL

Average wind speed in May - Key West, FL
  • Average wind speed in May: 12.2mph

The windiest months (with the highest average wind speed) are January and November (14.4mph).
The calmest month (with the lowest average wind speed) is July (9.5mph).

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Average humidity in May
Key West, FL

Average humidity in May - Key West, FL
  • Average humidity in May: 77%

The month with the highest relative humidity is February (78%).
The months with the lowest relative humidity are July, August and September (74%).

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Average rainfall in May
Key West, FL

Average rainfall in May - Key West, FL
  • Average rainfall in May: 3.5"

The wettest month (with the highest rainfall) is September (5.12").
The driest month (with the least rainfall) is March (0.67").

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Average rainfall days in May
Key West, FL

Average rainfall days in May - Key West, FL
  • Average rainfall days in May: 16.5 days

The months with the highest number of rainy days are August and September (23.1 days).
The month with the least rainy days is February (11 days).

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Average sea temperature in May
Key West, FL

Average sea temperature in May - Key West, FL
  • Average sea temperature in May: 80.7°F

The best month for swimming (with the highest average sea temperature) is August (86.9°F).
The coldest months (with the lowest average sea temperature) are January and February (71.2°F).

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Average daylight in May /
Average sunshine in May
Key West, FL

Average daylight in May / Average sunshine in May - Key West, FL
  • Average daylight in May: 13h and 20min

The month with the longest days is June (Average daylight: 13h and 38min).
The month with the shortest days is December (Average daylight: 10h and 39min).

  • Average sunshine in May: 10.9h

The month with the most sunshine is July (Average sunshine: 11h).
The month with the least sunshine is December (Average sunshine: 6.3h).

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Average sunshine days in May
Key West, FL

Average sunshine days in May - Key West, FL
  • Average sunshine days in May: 10.8 days

The month with the most sunshine days is March (17 days).
The month with the least sunshine days is September (4.5 days).

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Average UV index in May
Key West, FL

Average UV index in May - Key West, 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 West, FL

Average cloud cover in May - Key West, FL
  • Average cloud cover in May: 26

The month with the most cloud cover is January (Cloud cover 34).
The month with the least cloud cover is April (Cloud cover 23).

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Average visibility in May
Key West, FL

Average visibility in May - Key West, 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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