May weather forecast
Jacksonville, FL

Water geysers at the fountain of Jacksonville in Florida, USA, with the cityscape
Water geysers at the fountain of Jacksonville in Florida, USA, with the cityscape

Weather in May

May, the last month of the spring in Jacksonville, is another warm month, with an average temperature varying between 68°F (20°C) and 85.5°F (29.7°C).

Temperature

In May, the average high-temperature slightly increases from 80.1°F (26.7°C) in April to a still warm 85.5°F (29.7°C). In Jacksonville, the average low-temperature is 68°F (20°C).

Heat index

The average heat index in May is calculated to be a hot 93.2°F (34°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
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', 'real feel', 'feels like', or 'apparent temperature', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. Additional factors like activity, metabolic differences, clothing, and wind affect individual temperature impact. 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

In May, the average relative humidity in Jacksonville, Florida, is 70%.

Rainfall

In Jacksonville, Florida, in May, it is raining for 12.9 days, with typically 2.09" (53mm) of accumulated precipitation. In Jacksonville, during the entire year, the rain falls for 172.6 days and collects up to 25.35" (644mm) of precipitation.

Snowfall

January through November are months without snowfall in Jacksonville.

Ocean temperature

In May, the average ocean temperature is 74.8°F (23.8°C).
Note: Depending on a person's sensitivity to cold, with regards to sunshine, wind, and air temperature, a quick swim in 74.8°F (23.8°C) water may be enjoyable. (FYI: The official water temperature required for the Olympic swimming competition is 77°F (25°C) to 82.4°F (28°C).)

Daylight

In May, the average length of the day in Jacksonville is 13h and 41min.
On the first day of May in Jacksonville, sunrise is at 6:43 am and sunset at 8:04 pm. On the last day of the month, sunrise is at 6:25 am and sunset at 8:23 pm EDT.

Sunshine

The average sunshine in May in Jacksonville is 10.7h.

UV index

May through August, with an average maximum UV index of 7, are months with the highest UV index in Jacksonville. A UV Index estimate of 6 to 7 represents a high health risk from exposure to the Sun's UV rays for average individuals.
Note: In May, the average maximum UV index of 7 translate into the following recommendations:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. 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 temperature in May in Jacksonville?

In May, the average high-temperature is 85.5°F (29.7°C), and the average low-temperature is 68°F (20°C). The average heat index (a.k.a. 'apparent temperature', 'feels like'), which factors the actual air temperature with the relative humidity, in May is calculated to be 93.2°F (34°C).

What is the average humidity in May in Jacksonville?

The average relative humidity in May in Jacksonville, Florida, is 70%.

How much does it rain in Jacksonville in May?

In Jacksonville, Florida, in May, during 12.9 rainfall days, 2.09" (53mm) of precipitation is typically accumulated.

When it does not snow in Jacksonville?

January through November are months without snowfall.

What is the water temperature in May in Jacksonville?

In Jacksonville, the average seawater temperature in May is 74.8°F (23.8°C). Depending on a person's sensitivity to cold, with regards to sunshine, wind, and air temperature, a quick swim in 74.8°F (23.8°C) water may be enjoyable.

How many hours of daylight does Jacksonville have in May?

In Jacksonville, the average day length in May is 13h and 41min.

When is the sunrise / sunset in May in Jacksonville?

In May, on the first day of the month, sunrise is at 6:43 am and sunset at 8:04 pm. On the last day of the month, in Jacksonville, Florida, sunrise is at 6:25 am and sunset at 8:23 pm EDT.

How long on average sun shines in May in Jacksonville?

In May, the average sunshine duration in Jacksonville, Florida, is 10.7h.

What is the month with the highest UV index in Jacksonville?

May through August, with an average maximum UV index of 7, are months with the highest UV index.

What is the UV index intensity in May in Jacksonville?

In May, the average daily maximum UV index in Jacksonville, Florida, is 7. A UV Index of 6 to 7 symbolizes a high health threat from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Jacksonville, FL

Average temperature in May - Jacksonville, FL
  • Average high temperature in May: 85.5°F

The warmest months (with the highest average high temperature) are July and August (91.4°F).
The month with the lowest average high temperature is January (63.1°F).

  • Average low temperature in May: 68°F

The month with the highest average low temperature is August (76.6°F).
The coldest month (with the lowest average low temperature) is January (47.8°F).

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Average pressure in May
Jacksonville, FL

Average pressure in May - Jacksonville, FL
  • Average pressure in May: 30.02"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.98"Hg).

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Average wind speed in May
Jacksonville, FL

Average wind speed in May - Jacksonville, FL
  • Average wind speed in May: 6.2mph

The windiest month (with the highest average wind speed) is April (6.8mph).
The calmest months (with the lowest average wind speed) are July and August (5.2mph).

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Average humidity in May
Jacksonville, FL

Average humidity in May - Jacksonville, FL
  • Average humidity in May: 70%

The month with the highest relative humidity is December (76%).
The month with the lowest relative humidity is March (69%).

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Average rainfall in May
Jacksonville, FL

Average rainfall in May - Jacksonville, FL
  • Average rainfall in May: 2.09"

The wettest month (with the highest rainfall) is August (3.66").
The driest month (with the least rainfall) is January (1.1").

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Average rainfall days in May
Jacksonville, FL

Average rainfall days in May - Jacksonville, FL
  • Average rainfall days in May: 12.9 days

The month with the highest number of rainy days is August (23.3 days).
The month with the least rainy days is November (9 days).

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Average snowfall days in May
Jacksonville, FL

Average snowfall days in May - Jacksonville, FL
  • Average snowfall days in May: 0 days

The month with the highest number of snowfall days is December (0.1 days).
The months with the least snowfall days are January, February, March, April, May, June, July, August, September, October and November (0 days).

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Average sea temperature in May
Jacksonville, FL

Average sea temperature in May - Jacksonville, FL
  • Average sea temperature in May: 74.9°F

The best month for swimming (with the highest average sea temperature) is August (83.5°F).
The coldest month (with the lowest average sea temperature) is February (60.4°F).

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Average daylight in May /
Average sunshine in May
Jacksonville, FL

Average daylight in May / Average sunshine in May - Jacksonville, FL
  • Average daylight in May: 13h and 41min

The month with the longest days is June (Average daylight: 14h and 4min).
The month with the shortest days is December (Average daylight: 10h and 14min).

  • Average sunshine in May: 10h and 42min

The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 54min).

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Average sunshine days in May
Jacksonville, FL

Average sunshine days in May - Jacksonville, FL
  • Average sunshine days in May: 16.3 days

The month with the most sunshine days is January (18.8 days).
The month with the least sunshine days is August (6.3 days).

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Average UV index in May
Jacksonville, FL

Average UV index in May - Jacksonville, FL
  • Average UV index in May: 7

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

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Average cloud cover in May
Jacksonville, FL

Average cloud cover in May - Jacksonville, FL
  • Average cloud cover in May: 27

The month with the most cloud cover is December (Cloud cover 39).
The month with the least cloud cover is May (Cloud cover 27).

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Average visibility in May
Jacksonville, FL

Average visibility in May - Jacksonville, 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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