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 is hot and humid with regular rainfall. The average daily temperatures are in the range of 80°F (26.7°C) to 90°F (32.2°C) with an uncomfortable mugginess in the atmosphere. Prevailing easterly winds rarely allow the temperatures to cross 95°F (35°C). Carry an umbrella and rain gear during a visit in July, though it is a better idea to avoid Key West during this period.
There are plenty of seafood and fast food options on Duval Street for a busy traveler out to buy a souvenir on a hot July day.

What is the temperature in July in Key West?

In July, the average high-temperature is 89.2°F (31.8°C), and the average low-temperature is 79.9°F (26.6°C).

What is the average humidity in July in Key West?

In Key West, the average relative humidity in July is 72.2%.

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

In Key West, in July, during 11.7 rainfall days, 4.1" (104mm) of precipitation is typically accumulated.

How warm is the water in July in Key West?

In Key West, the average seawater temperature in July 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.

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

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

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

In Key West, the average sunshine in July is 10.5h.

When is the highest UV index in Key West?

Months with the highest UV index in Key West, Florida, are April through August, with an average UV index of 11.

How high is the UV index in July in Key West?

In Key West, the average UV index in July is 11.
Average temperature in July - Key West, FL
  • Average high temperature in July: 89.3°F

The warmest month (with the highest average high temperature) is August (89.4°F).
The month with the lowest average high temperature is January (74.3°F).

  • Average low temperature in July: 79.8°F

The month with the highest average low temperature is July (79.8°F).
The coldest month (with the lowest average low temperature) is January (64.2°F).

Average humidity in July - Key West, FL
  • Average humidity in July: 72.2%

The month with the highest relative humidity is December (76.2%).
The month with the lowest relative humidity is April (70.1%).

Average rainfall in July - Key West, FL
  • Average rainfall in July: 4.1"

The wettest month (with the highest rainfall) is September (6.5").
The driest month (with the lowest rainfall) is March (1.6").

Average rainfall days in July - Key West, FL
  • Average rainfall days in July: 11.7 days

The month with the highest number of rainy days is September (16.2 days).
The month with the lowest number of rainy days is April (4.5 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: 10.5h

The month with most sunshine is May (Average sunshine: 11h).
The month with least sunshine is December (Average sunshine: 7.6h).

Average UV index in July - Key West, FL
  • Average UV index in July: 11

Months with the highest UV index are April, May, June, July and August (UV index 11).
Months with the lowest UV index are January and December (UV index 6).

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