July weather forecast
Key West, FL

July, the same as June, is a moderately hot summer month in Key West, Florida, with temperature in the range of an average high of 84.7°F (29.3°C) and an average low of 82.8°F (28.2°C).

Temperature

In Key West, the average high-temperature in July is relatively the same as in June - a still moderately hot 84.7°F (29.3°C). The average low-temperature, in Key West, is 82.8°F (28.2°C).

Heat index

The average heat index in July is computed 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 into consideration that the heat index values are calculated for shade and light wind conditions. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'feels like', 'apparent temperature', or 'real feel', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. This effect is individual, with diverse people perceiving weather differently for numerous reasons (differences in body mass, height, and shape, metabolic differences, wind), and activity. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

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

Rainfall

In Key West, in July, during 20.7 rainfall days, 3.66" (93mm) of precipitation is typically accumulated. In Key West, 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: For any water activity, surface water temperatures between 77°F (25°C) and 84.2°F (29°C) are considered as excellent and extremely pleasant for lengthened periods.

Daylight

In July, the average length of the day in Key West, Florida, is 13h and 29min.
On the first day of the month, sunrise is at 6:41 am and sunset at 8:20 pm. On the last day of July, in Key West, Florida, sunrise is at 6:55 am and sunset at 8:12 pm EDT.

Sunshine

July has the most sunshine of the year in Key West, Florida, with an average of 11h of sunshine.

UV index

April through October, with an average maximum UV index of 7, are months with the highest UV index in Key West. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for the ordinary person.
Note: In July, the average maximum UV index of 7 translate into the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.