May weather forecast and climate
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 temperature in the range of an average high of 85.5°F (29.7°C) and an average low of 68°F (20°C).

Temperature

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

Heat index

In May, the average heat index is appraised at a tropical 93.7°F (34.3°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With the 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 'apparent temperature', 'felt air temperature', 'feels like', or 'real feel', is a measure that combines both air temperature and relative humidity into a single value that indicates how hot the weather feels. Additional factors like wind, pregnancy, differences in body mass, height, and shape, and activity influence one's weather impression. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

In May, the average relative humidity is 70%.

Rainfall

In Jacksonville, during 12.9 rainfall days, 2.09" (53mm) of precipitation is typically accumulated. Throughout the year, in Jacksonville, there are 172.6 rainfall days, and 25.35" (644mm) of precipitation is accumulated.

Snowfall

January through November are months without snowfall in Jacksonville.

Ocean temperature

In May, the average ocean temperature in Jacksonville 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 is 13.7h.

Sunshine

In May, the average sunshine is 10.7h.

UV index

Months with the highest UV index are May through August, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health vulnerability from the exposure to the Sun's UV rays for average individuals.
Note: The average daily UV index of 7 in May transform into the following instructions:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. 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. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. 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?

The average high-temperature, in May, in Jacksonville, is 85.5°F (29.7°C), while the average low-temperature is 68°F (20°C). The average heat index (a.k.a. 'feels like', 'real feel'), that takes the relative humidity and factores it into the air temperature reading, in May is appraised at 93.7°F (34.3°C).

What is the average humidity in May in Jacksonville?

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

How many days does it rain in May in Jacksonville?

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?

In Jacksonville, Florida, snow does not fall in January through November.

How warm is the water in May in Jacksonville?

In Jacksonville, in May, the average water temperature is 74.8°F (23.8°C). A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 74.8°F (23.8°C) water.

How many hours of daylight does Jacksonville have in May?

In May, the average length of the day in Jacksonville is 13.7h.

How long on average sun shines in May in Jacksonville?

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

When is the highest UV index in Jacksonville?

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

How high is the UV index in May in Jacksonville?

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

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"

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

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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).
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: 13.7h

The month with the longest days is June (Average daylight: 14.1h).
The month with the shortest days is December (Average daylight: 10.2h).

  • Average sunshine in May: 10.7h

The month with the most sunshine is July (Average sunshine: 10.9h).
The month with the least sunshine is December (Average sunshine: 5.9h).

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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

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

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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