August weather forecast
Jacksonville, FL

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

In Jacksonville, the warmest period comes during July and August, when the average high-temperature touches 91.4°F (33°C).

Heat index

The heat index for August is evaluated at a burning hot 114.8°F (46°C). Heed: Expect heat cramps and heat exhaustion. Continued action may cause heatstroke.
Heat index specifics point out values are for conditions of shade and a slight breeze. Direct sunlight has the potential to heighten heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', integrates the air's temperature and its humidity to showcase the felt temperature by people. An individual's perception of weather can be influenced by a variety of factors including metabolic differences, being pregnant, and their degree of physical exertion. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to babies and toddlers. Youngsters frequently overlook the need for breaks and fluid intake. Thirst is an advanced sign of dehydration - thereby highlighting the importance of keeping hydrated, particularly during long physical activities.
When it comes to cooling down, the human body's primary method is through perspiration, making use of sweat evaporation to eliminate excess heat. With high air temperature and humidity (high heat index) conditions, sweat production is restricted, leading to an amplified perception of heat. With body temperatures on the rise, inefficient heat shedding can lead to dehydration and its associated complications.

Humidity

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

Rainfall

August is the month with the most rainfall. Rain falls for 23.3 days and accumulates 3.66" (93mm) of precipitation.

Snowfall

January through November are months without snowfall.

Ocean temperature

The month with the warmest seawater is August, with an average ocean temperature of 83.5°F (28.6°C).
Note: Between the temperatures of 77°F (25°C) and 84.2°F (29°C), water is considered very warm, providing pleasure in water activities without discomfort over lengthy periods.

Daylight

The average length of the day in August 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, sunrise is at 7:03 am and sunset at 7:50 pm EDT.

Sunshine

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

UV index

May through August, with an average maximum UV index of 7, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The UV index of 7 during August leads to these advisories:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. Between 10 a.m. and 4 p.m., the Sun's UV radiation is at its peak. Limit your exposure to direct sunlight during these hours. 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. Watch out! Sand and water enhance the UV exposure you receive.