July weather forecast
Key West, FL

July weather in Key West exhibits hotter temperatures and higher humidity. However, the sea provides a constant, cooling breeze which moderates the heat. The sunny days and humid evenings become the routine daily weather pattern for July. Alongside this, Key West delights in the increased sea temperature that makes marine activities a delight. Significantly, July holds the lowest relative humidity of 74%, while still preserving the town's tropical climate attributes.

Temperature

The commencement of July brings an average high-temperature of a still moderately hot 84.7°F (29.3°C), marking an inconsequential divergence from June. Key West indicates a consistently low-temperature of 82.8°F (28.2°C) during the nights of July.

Heat index

In July, the average heat index is computed to be a tropical 93.2°F (34°C). Extra precautions are necessary, heat cramps and heat exhaustion are plausible outcomes. Extended activity could lead to heatstroke.
For clarity, heat index numbers account for light winds and areas under shade. The direct sun can potentially cause the heat index to increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', unifies temperature and humidity readings to offer a comprehensive feel of warmth. The influence of weather is personal, with varied individuals experiencing it differently due to differences in body mass, stature, and physical exertion levels. It is noteworthy to mention that direct sunlight exposure can augment the felt temperature, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. Typically, young kids are at a higher risk than adults since they sweat less. Also, the larger skin surface in proportion to their small bodies and the heightened heat production due to their active nature adds to their vulnerability.

Humidity

The months with the lowest humidity are July through September, with an average relative humidity of 74%.

Rainfall

In Key West, during July, the rain falls for 20.7 days and regularly aggregates up to 3.66" (93mm) of precipitation. In Key West, Florida, during the entire year, the rain falls for 199.2 days and collects up to 31.61" (803mm) of precipitation.

Ocean temperature

In July, the average ocean temperature is 85.5°F (29.7°C).
Note: Water temperatures between 77°F (25°C) and 84.2°F (29°C) are ideal for all water activities, offering enjoyment without causing discomfort over extended periods.

Daylight

In July, the average length of the day is 13h and 29min.
On the first day of July, sunrise is at 6:42 am and sunset at 8:20 pm. On the last day of the month, sunrise is at 6:55 am and sunset at 8:11 pm EDT.

Sunshine

With an average of 11h of sunshine, July has the most sunshine of the year.

UV index

The months with the highest UV index are April through October, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health risk from unprotected exposure to Sun's UV rays for the ordinary person.
Note: A maximum UV index of 7 in July translates into the following recommendations:
Steer clear of overexposure. Fair-skinned individuals can be scorched in less than 20 minutes. The Sun's UV radiation is most potent between the hours of 10 a.m. and 4 p.m. Try to avoid direct sunlight during this time. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Be alert! The reflection of water and sand augments UV radiation intensity.