May weather forecast
Siesta Key, FL

Weather in May

May, the last month of the spring in Siesta Key, is also a moderately hot month, with an average temperature fluctuating between 72.7°F (22.6°C) and 84.2°F (29°C).

Temperature

In May, the average high-temperature is relatively the same as in April - a still moderately hot 84.2°F (29°C). In Siesta Key, in May, the average low-temperature is 72.7°F (22.6°C).

Heat index

The average heat index in May is computed to be a tropical 91.6°F (33.1°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
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 'felt air temperature', 'apparent temperature', 'feels like', or 'real feel', is a measure of how hot it feels when the actual air humidity is factored in. Additional factors like pregnancy, clothing, wind, and activity influence one's weather impression. Be aware that direct exposure to sunlight increases heat impact and may raise the 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

March through May, with an average relative humidity of 72%, are the least humid months.

Rainfall

In May, in Siesta Key, the rain falls for 15.1 days. Throughout May, 2.56" (65mm) of precipitation is accumulated. In Siesta Key, during the entire year, the rain falls for 183.1 days and collects up to 34.92" (887mm) of precipitation.

Ocean temperature

In Siesta Key, the average water temperature is 78.4°F (25.8°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

In May, the average length of the day is 13h and 30min.
On the first day of May in Siesta Key, sunrise is at 6:51 am and sunset at 8:03 pm. On the last day of the month, sunrise is at 6:35 am and sunset at 8:20 pm EDT.

Sunshine

May has the most sunshine of the year, with an average of 11.1h of sunshine.

UV index

The months with the highest UV index in Siesta Key, Florida, are May through September, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV radiation for average individuals.
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. 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 reflection of water and sand dramatically increases exposure to the UV rays.
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FAQ

What is the temperature in May in Siesta Key?

The average high-temperature, in May, in Siesta Key, is 84.2°F (29°C), while the average low-temperature is 72.7°F (22.6°C). In May, the average heat index (a.k.a. 'apparent temperature', 'real feel'), which represents the influence of relative humidity on air temperature, is computed to be 91.6°F (33.1°C).

What is the least humid month in Siesta Key?

March through May, with an average relative humidity of 72%, are the least humid months in Siesta Key, Florida.

What is the average humidity in May in Siesta Key?

In May, the average relative humidity is 72%.

How many days does it rain in May in Siesta Key?

In Siesta Key, Florida, in May, during 15.1 rainfall days, 2.56" (65mm) of precipitation is typically accumulated.

How warm is the water in May in Siesta Key?

In May, the average ocean temperature is 78.4°F (25.8°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 Siesta Key have in May?

The average day length in May in Siesta Key, Florida, is 13h and 30min.

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

On the first day of May in Siesta Key, sunrise is at 6:51 am and sunset at 8:03 pm. On the last day of the month, sunrise is at 6:35 am and sunset at 8:20 pm EDT.

What month has the most sunshine in Siesta Key?

The month with the most sunshine is May, with an average of 11.1h of sunshine.

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

In Siesta Key, Florida, the average sunshine duration in May is 11.1h.

When is the highest UV index in Siesta Key?

The months with the highest UV index in Siesta Key, Florida, are May through September, with an average maximum UV index of 7.

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

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

Average temperature in May
Siesta Key, FL

Average temperature in May - Siesta Key, FL
  • Average high temperature in May: 84.2°F

The warmest month (with the highest average high temperature) is August (88.5°F).
The month with the lowest average high temperature is January (68.5°F).

  • Average low temperature in May: 72.7°F

The month with the highest average low temperature is August (79.7°F).
The coldest month (with the lowest average low temperature) is January (56.1°F).

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Average pressure in May
Siesta Key, FL

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

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is September (29.95"Hg).

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Average wind speed in May
Siesta Key, FL

Average wind speed in May - Siesta Key, FL
  • Average wind speed in May: 8mph

The windiest month (with the highest average wind speed) is January (9.3mph).
The calmest month (with the lowest average wind speed) is July (6.4mph).

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Average humidity in May
Siesta Key, FL

Average humidity in May - Siesta Key, FL
  • Average humidity in May: 72%

The month with the highest relative humidity is December (76%).
The months with the lowest relative humidity are March, April and May (72%).

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Average rainfall in May
Siesta Key, FL

Average rainfall in May - Siesta Key, FL
  • Average rainfall in May: 2.56"

The wettest month (with the highest rainfall) is August (6.42").
The driest months (with the least rainfall) are February and November (1.06").

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Average rainfall days in May
Siesta Key, FL

Average rainfall days in May - Siesta Key, FL
  • Average rainfall days in May: 15.1 days

The month with the highest number of rainy days is August (26.8 days).
The months with the least rainy days are January, February and November (8.3 days).

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Average sea temperature in May
Siesta Key, FL

Average sea temperature in May - Siesta Key, FL
  • Average sea temperature in May: 78.4°F

The best month for swimming (with the highest average sea temperature) is August (86.7°F).
The coldest month (with the lowest average sea temperature) is January (64.1°F).

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

Average daylight in May / Average sunshine in May - Siesta Key, FL
  • Average daylight in May: 13h and 30min

The month with the longest days is June (Average daylight: 13h and 50min).
The month with the shortest days is December (Average daylight: 10h and 28min).

  • Average sunshine in May: 11h and 6min

The month with the most sunshine is May (Average sunshine: 11h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 30min).

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Average sunshine days in May
Siesta Key, FL

Average sunshine days in May - Siesta Key, FL
  • Average sunshine days in May: 14 days

The month with the most sunshine days is January (21.1 days).
The month with the least sunshine days is August (2.5 days).

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Average UV index in May
Siesta Key, FL

Average UV index in May - Siesta Key, FL
  • Average UV index in May: 7

The months with the highest UV index are May, June, July, August and September (UV index 7).
The month with the lowest UV index is January (UV index 4).

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Average cloud cover in May
Siesta Key, FL

Average cloud cover in May - Siesta Key, FL
  • Average cloud cover in May: 22

The months with the most cloud cover are January and December (Cloud cover 30).
The month with the least cloud cover is May (Cloud cover 22).

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Average visibility in May
Siesta Key, FL

Average visibility in May - Siesta Key, 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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