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

Weather in July

July, like June, in Key West, Florida, is another warm summer month, with average temperature fluctuating between 82.8°F (28.2°C) and 84.7°F (29.3°C).

Temperature

In July, the average high-temperature is essentially 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

In July, the average heat index is computed to be a tropical 93.6°F (34.2°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. 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', 'feels like', 'apparent temperature', or 'real feel', combines air temperature and relative humidity to represent a human perceived temperature equivalent. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (metabolic differences, wind, clothing). 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 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

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

Rainfall

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

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

The average length of the day in Key West is 13.5h.

Sunshine

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

UV index

Months with the highest UV index in Key West are April through October, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health risk from the exposure to the Sun's UV rays for average individuals.
Note: The average daily UV index of 7 in July 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. 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. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in July in Key West?

In Key West, 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. 'real feel', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, in July is computed to be 93.6°F (34.2°C).

What are the least humid months in Key West?

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

What is the average humidity in July in Key West?

In July, the average relative humidity in Key West is 74%.

How much does it rain in Key West in July?

In Key West, in July, during 20.7 rainfall days, 3.66" (93mm) of precipitation is typically accumulated.

What is the water temperature in July in Key West?

In July, the average ocean temperature is 85.5°F (29.7°C). 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.

What is the average length of the day in July in Key West?

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

What month has the most sunshine in Key West?

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

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

In July, the average sunshine is 11h.

What is the month with 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 Key West, the average daily maximum UV index in July is 7. A UV Index of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to the Sun's UV rays.

Average temperature in July
Key West, FL

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).

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Average pressure in July
Key West, FL

Average pressure in July - Key West, FL
  • Average pressure in July: 30.02"

The month with the highest atmospheric pressure is January (30.09").
Months with the lowest atmospheric pressure are September and October (29.93").

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Average wind speed in July
Key West, FL

Average wind speed in July - Key West, FL
  • Average wind speed in July: 9.5mph

The windiest months (with the highest average wind speed) are January and November (14.4mph).
The calmest month (with the lowest average wind speed) is July (9.5mph).

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Average humidity in July
Key West, FL

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%).

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Average rainfall in July
Key West, FL

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 least rainfall) is March (0.67").

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Average rainfall days in July
Key West, FL

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 least rainy days is February (11 days).

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Average sea temperature in July
Key West, FL

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).
The coldest months (with the lowest average sea temperature) are January and February (71.2°F).

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Average daylight in July /
Average sunshine in July
Key West, FL

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 the shortest days is December (Average daylight: 10.6h).

  • Average sunshine in July: 11h

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

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Average sunshine days in July
Key West, FL

Average sunshine days in July - Key West, FL
  • Average sunshine days in July: 8.5 days

The month with the most sunshine days is March (17 days).
The month with the least sunshine days is September (4.5 days).

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Average UV index in July
Key West, FL

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).

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Average cloud cover in July
Key West, FL

Average cloud cover in July - Key West, FL
  • Average cloud cover in July: 27

The month with the most cloud cover is January (Cloud cover 34).
The month with the least cloud cover is April (Cloud cover 23).

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Average visibility in July
Key West, FL

Average visibility in July - Key West, FL
  • Average visibility in July: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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