July weather forecast
Key West, FL

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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 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

Key West's average high-temperature in July sits at a still warm 84.7°F (29.3°C), showing little difference from the previous month. July's average low-temperature is a still moderately hot 82.8°F (28.2°C), reflecting a minor difference from the day's peak temperatures.

Heat index

July's mean heat index is appraised at a tropical 93.2°F (34°C). Take additional safety steps, risk of heat exhaustion and heat cramps is notable. Prolonged activity may cause heatstroke.
Heat index guidelines indicate values are for light wind scenarios and shaded regions. The heat index may scale up by 15 Fahrenheit (8 Celsius) degrees with direct sun exposure.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is a fusion of air temperature and moisture levels to demonstrate the sensation of heat. The individual's temperature perception can be influenced by numerous factors such as metabolic variations, physical activity, and clothing. It is noteworthy that being in direct sunlight can enhance the weather's impact, raising the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Children frequently do not comprehend the need for rest and hydration. Thirst is an advanced stage of dehydration - staying hydrated, especially during extended physical exercises, is essential.

Humidity

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

Rainfall

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

Ocean temperature

In Key West, in July, the average water temperature is 85.5°F (29.7°C).
Note: Surface water temperatures falling between 77°F (25°C) and 84.2°F (29°C) are regarded as prime and extremely agreeable for enduring periods during any water activity.

Daylight

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

Sunshine

The month with the most sunshine is July, 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 estimate of 6 to 7 represents a high health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: In July, the UV index of 7 transforms into the following advice:
Fend off overexposure. Sun protection is vital. Avoid direct sunlight between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Keep in mind that shade structures may not provide complete protection. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. Take caution! The UV rays from the Sun gain strength from sand and water reflections.
Updated: Feb 10, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is it hot in Key West during July?

In Key West, 84.7°F (29.3°C) is the average high-temperature and 82.8°F (28.2°C) is the average low-temperature during July. In July, the average heat index (a.k.a. 'feels like', 'real feel'), which combines air temperature and relative humidity, is appraised at 93.2°F (34°C).

What is the least humid month in Key West?

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

What is the average humidity in July in Key West?

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

How many days does it rain in July in Key West?

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

How warm is the water in July in Key West?

In Key West, Florida, in July, the average water temperature is 85.5°F (29.7°C). 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.

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

In Key West, Florida, the average day length in July is 13h and 29min.

When is the sunrise / sunset in July in Key West?

On the first day of July in Key West, 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.

What month has the most sunshine in Key West?

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

How many hours of sunshine does Key West have in July?

In July, the average sunshine duration in Key West, Florida, is 11h.

What are the months with the highest UV index in Key West?

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

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

In Key West, Florida, the average daily maximum UV index in July is 7. A UV Index value of 6 to 7 symbolizes a high health risk from unprotected exposure to UV radiation.

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).

Average pressure in July
Key West, FL

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

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

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).

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%).
The months with the lowest relative humidity are July, August and September (74%).

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").

Average rainfall days in July
Key West, FL

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

The 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).

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).

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: 13h and 3min

The month with the longest days is June (Average daylight: 13h and 36min).
The month with the shortest days is December (Average daylight: 10h and 36min).

  • Average sunshine in July: 11h and 0min

The month with the most sunshine is July (Average sunshine: 11h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 18min).

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).

Average UV index in July
Key West, FL

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

The 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).

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).

Average visibility in July
Key West, FL

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

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

Key West, Florida, USA

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