Key West
Florida, USA
Long-term weather forecast
Long-term weather forecast

July weather forecast and climate
Key West, FL

A beach pier in Key West, Florida, with palm trees in the background
A beach pier in Key West, Florida, with palm trees in the background
July, like June, in Key West, Florida, is another warm summer month, with average temperature ranging between max 84.7°F (29.3°C) and min 82.8°F (28.2°C).

Temperature

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

Heat index

In July, the average heat index is appraised at a tropical 93.6°F (34.2°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'real feel', 'feels like', or 'apparent temperature', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (differences in body mass, height, and shape, wind, clothing). Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

July through September, with an average relative humidity of 74%, are the least humid months in Key West, Florida.

Rainfall

In July, the rain falls for 20.7 days. Throughout July, 3.66" (93mm) of precipitation is accumulated. Throughout the year, in Key West, there are 199.2 rainfall days, and 31.61" (803mm) of precipitation is accumulated.

Ocean temperature

In Key West, the average seawater temperature is 85.5°F (29.7°C).
Note: For swimming, diving, and other water activities, temperatures between 77°F (25°C) and 84.2°F (29°C) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

Daylight

The average length of the day in July is 13.5h.

Sunshine

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

UV index

Months with the highest UV index are April through October, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health risk from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 7 transform into the following instructions:
Take precautions against overexposure. Protection against sun damage is needed. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.

What is the temperature in July in Key West?

In Key West, Florida, in July, the average high-temperature is 84.7°F (29.3°C), and the average low-temperature is 82.8°F (28.2°C). The average heat index (a.k.a. 'feels like', 'felt air temperature'), that combines both air temperature and relative humidity, in July is calculated to 93.6°F (34.2°C).

What are the least humid months in Key West?

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

What is the average humidity in July in Key West?

In July, the average relative humidity is 74%.

How much does it rain in Key West in July?

In Key West, in July, it is raining for 20.7 days, with typically 3.66" (93mm) of accumulated precipitation.

What is the ocean temperature in July in Key West?

In July, the average ocean temperature in Key West, Florida, is 85.5°F (29.7°C). Water temperature between 77°F (25°C) and 84.2°F (29°C) 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 Key West have in July?

In Key West, Florida, the average length of the day in July is 13.5h.

What month has the most sunshine in Key West?

The month with the most sunshine in Key West, Florida, is July, with an average of 11h of sunshine.

How long on average sun shines in July in Key West?

The average sunshine in July in Key West, Florida, is 11h.

When is the highest UV index in Key West?

Months with the highest UV index are April through October, with an average maximum UV index of 7.

What is the UV index intensity in July in Key West?

In July, the average daily maximum UV index in Key West is 7. A UV Index of 6 to 7 symbolizes a high health vulnerability from the exposure to the Sun's UV radiation.
Average temperature in July - Key West, FL
  • Average high temperature in July: 84.7°F

The warmest month (with the highest average high temperature) is August (85.3°F).
The month with the lowest average high temperature is January (72.7°F).

  • Average low temperature in July: 82.8°F

The month with the highest average low temperature is August (82.9°F).
The coldest month (with the lowest average low temperature) is January (68.5°F).

Average humidity in July - Key West, FL
  • Average humidity in July: 74%

The month with the highest relative humidity is February (78%).
Months with the lowest relative humidity are July, August and September (74%).

Average rainfall in July - Key West, FL
  • Average rainfall in July: 3.66"

The wettest month (with the highest rainfall) is September (5.12").
The driest month (with the lowest rainfall) is March (0.67").

Average rainfall days in July - Key West, FL
  • Average rainfall days in July: 20.7 days

Months with the highest number of rainy days are August and September (23.1 days).
The month with the lowest number of rainy days is February (11 days).

Average sea temperature in July - Key West, FL
  • Average sea temperature in July: 85.5°F

The best month for swimming (with the highest average sea temperature) is August (86.9°F).
Coldest months (with the lowest average sea temperature) are January and February (71.2°F).

Average daylight in July / Average sunshine in July - Key West, FL
  • Average daylight in July: 13.5h

The month with the longest days is June (Average daylight: 13.6h).
The month with shortest days is December (Average daylight: 10.6h).

  • Average sunshine in July: 11h

The month with most sunshine is July (Average sunshine: 11h).
The month with least sunshine is December (Average sunshine: 6.3h).

Average UV index in July - Key West, FL
  • Average UV index in July: 7

Months with the highest UV index are April, May, June, July, August, September and October (UV index 7).
The month with the lowest UV index is January (UV index 5).