May weather forecast
Jacksonville, FL

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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

In May, the city fully embraces spring. The increase in temperatures continues while weather conditions remain reasonably stable. The most notable shift is the substantial rise in daylight hours from 12.9 hours in April to 13.7 hours. Jacksonville's appeal heightens, fueled by the generally pleasant weather conditions, clear skies, and longer days. The tranquility experienced in the weather patterns progressively fades, building anticipation for the moderately harsher summer months.

Temperature

Entering May, Jacksonville notices a subtle temperature elevation, with the average high-temperature advancing from April's moderately hot 80.1°F (26.7°C) to a still warm 85.5°F (29.7°C). In May, Jacksonville experiences an average nighttime temperature of 68°F (20°C).

Heat index

For May, the heat index 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.
Take note of the fact that heat index values are based on shaded circumstances with light airflows. The presence of direct sunlight can raise the heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', is an amalgamation of air temperature and humidity to express the equivalent perceived temperature. The effect is experienced differently by individuals, hinging on unique characteristics such as body mass, stature, and level of activity. Direct exposure to sun rays can potentially augment the heat sensation, elevating the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for children. Children often overlook the necessity for resting and fluid replenishment. Thirst is a late sign of dehydration - thus, it is critical to stay hydrated, especially during extended periods of physical activities.

Humidity

The average relative humidity in May in Jacksonville 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

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

Ocean temperature

In May, the average ocean temperature is 74.8°F (23.8°C).
Note: People sensitive to cold might find swimming in 74.8°F (23.8°C) challenging. However, conditions like sunshine, wind, and ambient temperature play a significant role in the overall comfort. Wetsuits, while optional, might be beneficial.

Daylight

The average length of the day in May is 13h and 41min.
On the first day of May in Jacksonville, sunrise is at 6:42 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

The months with the highest UV index are May through August, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high threat to health from unsafe exposure to UV radiation for the ordinary person.
Note: The UV index of 7 in May translates into these instructions:
Act on precautions and pay attention to sun safety recommendations. Avoidance of sunburn is obligatory. Avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is most intense, and remember that not all shade structures provide full protection. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection. Caution! Sand and water surfaces escalate the UV intensity from the Sun.
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Frequently asked questions

How hot is it in Jacksonville in May?

The high-temperature in Jacksonville during May is 85.5°F (29.7°C) and the low-temperature is 68°F (20°C). The average heat index (a.k.a. 'apparent temperature', 'feels like'), which calculates the temperature value influenced by the moisture in the air, in May is calculated to be 93.2°F (34°C).

What is the average humidity in May in Jacksonville?

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

How much does it rain in Jacksonville in May?

In Jacksonville, in May, it is raining for 12.9 days, with typically 2.09" (53mm) of accumulated precipitation.

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?

The average day length in May in Jacksonville is 13h and 41min.

When are sunrise and sunset in May in Jacksonville?

In May, on the first day of the month, sunrise is at 6:42 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.

How long on average sun shines in May in Jacksonville?

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

When is the highest UV index in Jacksonville?

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

What is the UV index reading in May in Jacksonville?

In Jacksonville, the average daily maximum UV index in May is 7. A UV Index of 6 to 7 symbolizes a high health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
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 4min

The month with the longest days is June (Average daylight: 14h and 6min).
The month with the shortest days is December (Average daylight: 10h and 12min).

  • Average sunshine in May: 10h and 4min

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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Jacksonville, Florida, USA

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