August 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 August

The usually relentless summer heat in Jacksonville experiences a slight reprieve in August. In comparison to July, there isn’t a major fluctuation in terms of weather characteristics. A notably slight decrease in sunshine hours from 10.9 hours in July to 10.4 hours in August occurs. While the city retains a heightened level of rainfall and humidity, it proves only a minuscule drop from the peak month of July. Nevertheless, seaside activities remain popular due to high sea temperatures.

Temperature

July and August are the warmest months in Jacksonville, with an average high-temperature of 91.4°F.

Heat index

The heat index for August is evaluated at a blazing hot 114.8°F. Precaution: Heat cramps along with heat exhaustion are possible. Heatstroke is a serious risk with continued exertion.
Keep in mind the heat index values are meant for areas in shade and with light wind. Exposure to direct sunshine can increase 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 index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. The influence of weather is personal, differing among a variety of individuals based on differences in body mass, stature, and the level of physical activity. Given the impact of direct sunlight, it's noteworthy that the felt temperature can rise by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Children frequently underestimate the necessity to rest and hydrate. Thirst is a late sign of dehydration - thus, it is vital to stay hydrated, particularly during lengthy physical exercises.
Humans rely on perspiration as a cooling mechanism, wherein the evaporating sweat counteracts excessive warmth. Elevated relative humidity diminishes evaporation, thereby reducing the body's ability to shed heat and creating a feeling of being too warm. When the heat gained surpasses the body's cooling capacity, temperatures rise, signaling potential health concerns.

Humidity

The average relative humidity in August is 75%.

Rainfall

The month with the most rainfall is August, when the rain falls for 23.3 days and typically aggregates up to 3.66" of precipitation.

Snowfall

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

Ocean temperature

August is the month with the warmest seawater in Jacksonville, with an average ocean temperature of 83.5°F.
Note: Temperatures between 77°F and 84.2°F are ideal for swimming, diving, and similar water activities, ensuring pleasure and comfort for extended periods without feeling uneasy.

Daylight

In August, the average length of the day in Jacksonville is 13h and 13min.
On the first day of the month, sunrise is at 6:45 am and sunset at 8:20 pm. On the last day of August, in Jacksonville, sunrise is at 7:02 am and sunset at 7:51 pm EDT.

Sunshine

In August, the average sunshine is 10.4h.

UV index

The months with the highest UV index are May through August, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV radiation for the average person.
Note: The maximum daily UV index of 7 during August translates into the following directions:
Stick with precautions and abide by sun safety procedures. Evading sunburn is essential. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is particularly strong, noting that parasols or canopies may not offer total sun protection. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Heads up! UV intensity is amplified by reflections from water and sand.
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FAQ

What is the hottest time of year in Jacksonville?

The height of temperatures in Jacksonville is seen during July and August, averaging a high-temperature of 91.4°F.

How hot does it get in Jacksonville in August?

The high-temperature during August is 91.4°F and the low-temperature is 76.6°F. The average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which takes the relative humidity and factors it into the air temperature reading, in August is evaluated at 114.8°F.

What is the average humidity in August in Jacksonville?

In Jacksonville, Florida, the average relative humidity in August is 75%.

What is the rainiest month in Jacksonville?

August is the month with the most rainfall in Jacksonville. Rain falls for 23.3 days and accumulates 3.66" of precipitation.

How many days does it rain in August in Jacksonville?

In Jacksonville, Florida, during August, the rain falls for 23.3 days and regularly aggregates up to 3.66" of precipitation.

When it does not snow in Jacksonville?

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

What is the month with the warmest ocean in Jacksonville?

The month with the warmest seawater is August, with an average ocean temperature of 83.5°F.

What is the water temperature in August in Jacksonville?

In August, the average ocean temperature is 83.5°F. Water temperature between 77°F and 84.2°F 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 Jacksonville have in August?

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

When are sunrise and sunset in August in Jacksonville?

In August, on the first day of the month, sunrise is at 6:45 am and sunset at 8:20 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 7:51 pm EDT.

How long on average sun shines in August in Jacksonville?

In August, the average sunshine duration in Jacksonville, Florida, is 10.4h.

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.

How high is the UV index in August in Jacksonville?

In Jacksonville, Florida, the average daily maximum UV index in August is 7. A UV Index estimate of 6 to 7 represents a high health risk from exposure to Sun's UV rays.
Average high temperature
Average low temperature
Average pressure
Average wind speed
Average max. wind speed
Average wind speed gusts
Average humidity
Average rainfall
Average rainfall days
Average snowfall days
Average sea temperature
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in August
Jacksonville, FL

Average temperature in August - Jacksonville, FL
  • Average high temperature in August: 91.4°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 August: 76.6°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 August
Jacksonville, FL

Average pressure in August - Jacksonville, FL
  • Average pressure in August: 29.98"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 August
Jacksonville, FL

Average wind speed in August - Jacksonville, FL
  • Average wind speed in August: 5.2mph

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 August
Jacksonville, FL

Average humidity in August - Jacksonville, FL
  • Average humidity in August: 75%

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 August
Jacksonville, FL

Average rainfall in August - Jacksonville, FL
  • Average rainfall in August: 3.66"

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 August
Jacksonville, FL

Average rainfall days in August - Jacksonville, FL
  • Average rainfall days in August: 23.3 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 August
Jacksonville, FL

Average snowfall days in August - Jacksonville, FL
  • Average snowfall days in August: 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 August
Jacksonville, FL

Average sea temperature in August - Jacksonville, FL
  • Average sea temperature in August: 83.5°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 August /
Average sunshine in August
Jacksonville, FL

Average daylight in August / Average sunshine in August - Jacksonville, FL
  • Average daylight in August: 13h and 1min

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 August: 10h and 2min

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 August
Jacksonville, FL

Average sunshine days in August - Jacksonville, FL
  • Average sunshine days in August: 6.3 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 August
Jacksonville, FL

Average UV index in August - Jacksonville, FL
  • Average UV index in August: 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 August
Jacksonville, FL

Average cloud cover in August - Jacksonville, FL
  • Average cloud cover in August: 30

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 August
Jacksonville, FL

Average visibility in August - Jacksonville, FL
  • Average visibility in August: 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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