July weather forecast
Jacksonville, FL

In the heart of summer, the weather in July substantiates Jacksonville's appeal. The warmth experienced in June escalates, generating a thriving, yet intense, summer. Rainfall hits the peak for the year at 3.23" (82mm), making July the wettest month. Pairing this with the soaring temperatures creates an authentic Floridian summer. Despite occasional bouts of high humidity, it remains a favorite holiday destination for sun and beach enthusiasts.

Temperature

Jacksonville's warmest season falls during July and August, averaging a high-temperature of 91.4°F (33°C).

Heat index

In July, the heat index is evaluated at a life-threatening hot 113°F (45°C). Remain alert: Heat exhaustion and heat cramps are predicted. Extended effort can lead to heatstroke.
It is emphasized that the heat index's values are meant for shaded zones with mild winds. A rise of up to 15 Fahrenheit (8 Celsius) degrees in the heat index could result from direct sunlight.
Note: The heat index, also known as 'feels like' or 'real feel', measures the perceived warmth when incorporating the humidity present in the air. This effect tends to be personal, with the weather perception differing among individuals due to variations in body mass, height, and exertion. By being directly under the sun, it's possible for the felt temperature to increase by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Children usually face more risks than adults as their ability to sweat is less. Additionally, their larger skin surface in relation to their petite bodies and higher heat output due to their activities increases their vulnerability.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. An upsurge in relative humidity affects normal body cooling mechanisms by slowing evaporation, hence reducing the rate at which the body cools and intensifying the perception of heat. As the body accumulates more heat than it can release, body temperature goes up, increasing the risk of heat-related health issues.

Humidity

In July, the average relative humidity is 74%.

Rainfall

In July, the rain falls for 22.1 days. Throughout July, 3.23" (82mm) of precipitation is accumulated. 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, snow does not fall in January through November.

Ocean temperature

In Jacksonville, in July, the average water temperature is 82°F (27.8°C).
Note: Engaging in water activities, such as swimming or diving, in temperatures from 77°F (25°C) to 84.2°F (29°C) is very pleasurable for extended periods, without any discomfort.

Daylight

In July, the average length of the day is 13h and 53min.
On the first day of July, sunrise is at 6:28 am and sunset at 8:32 pm. On the last day of the month, sunrise is at 6:44 am and sunset at 8:21 pm EDT.

Sunshine

July has the most sunshine of the year, with an average of 10.9h of sunshine.

UV index

May through August, with an average maximum UV index of 7, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV radiation for the average person.
Note: The UV index of 7 in July translates into these instructions:
Employ safeguards and advocate sun safety protocols. Shielding against skin and eye damage is crucial. Seek shade and limit direct Sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its peak, but be aware that not all shade structures provide complete sun protection. Boost your sun resistance with garments that are densely woven yet spacious. Heads up! Sand and water reflection magnifies the UV exposure from the Sun.