April 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 April

April in Key West, Florida, sees an uptick in temperature and an increase in rainfall levels, a hallmark of the city's hot, humid and wet climate pattern. Even as the rains intensify, the city dons an aesthetic beauty that is noticeable. The weather patterns of April further exemplify the city's tropical monsoon climate, which is characterized by constant humidity and ample rainfall. On the brighter side, despite the humidity, the city exhibits unmatched vitality in April. Notably, there is a spike in sea temperature reaching 77.7°F (25.4°C), providing an opportunity for water-related activities.

Temperature

The start of April marks an average high-temperature of a still moderately hot 77.4°F (25.2°C), hardly distinguishable from the conditions in March. Key West experiences a steady nighttime temperature of 74.8°F (23.8°C) throughout the month of April.

Humidity

In Key West, Florida, the average relative humidity in April is 77%.

Rainfall

In Key West, during April, the rain falls for 13.4 days and regularly aggregates up to 1.54" (39mm) of precipitation. 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 Key West, the average seawater temperature in April is 77.7°F (25.4°C).
Note: Water temperature ranging from 77°F (25°C) to 84.2°F (29°C) is seen as very warm and delightful by everyone. During these temperatures, water activities become enjoyable, without causing discomfort for extended periods.

Daylight

In Key West, the average length of the day in April is 12h and 45min.
On the first day of the month, sunrise is at 7:17 am and sunset at 7:43 pm. On the last day of April, sunrise is at 6:52 am and sunset at 7:56 pm EDT.

Sunshine

In Key West, the average sunshine in April is 9.7h.

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 of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV radiation for the ordinary person.
Note: During April, 7 as the daily maximum UV index converts into the following advice:
Exercise precautions and adapt sun safety practices. Defence against skin and eye affliction is paramount. Stay out of direct sunlight between 10 a.m. and 4 p.m., when UV radiation is most intense, and remember that not all shade structures provide complete protection. Tightly woven clothing, when worn loosely, shields effectively against the Sun. Warning! The reflection of sand and water increases the UV dose.

Frequently asked questions

What is the usual temperature for Key West in April?

During April, Key West experiences an average high-temperature of 77.4°F (25.2°C) and a low-temperature of 74.8°F (23.8°C).

What is the average humidity in April?

In April, the average relative humidity is 77%.

How much does it rain in April?

In April, the rain falls for 13.4 days. Throughout April, 1.54" (39mm) of precipitation is accumulated.

What is the water temperature in April in Key West?

In Key West, the average seawater temperature in April is 77.7°F (25.4°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 April?

The average day length in April is 12h and 45min.

What time are sunrise and sunset in April?

On the first day of April, sunrise is at 7:17 am and sunset at 7:43 pm. On the last day of the month, sunrise is at 6:52 am and sunset at 7:56 pm EDT.

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

The average sunshine duration in April is 9.7h.

What is the month with the highest UV index?

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

How high is the UV index in April?

The average daily maximum UV index in April is 7. A UV Index reading of 6 to 7 represents a high health threat from exposure to Sun's UV rays.

Average temperature in April
Key West, FL

Average temperature in April - Key West, FL
  • Average high temperature in April: 77.4°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 April: 74.8°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 April
Key West, FL

Average pressure in April - Key West, FL
  • Average pressure in April: 30.01"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 April
Key West, FL

Average wind speed in April - Key West, FL
  • Average wind speed in April: 13.1mph

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 April
Key West, FL

Average humidity in April - Key West, FL
  • Average humidity in April: 77%

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 April
Key West, FL

Average rainfall in April - Key West, FL
  • Average rainfall in April: 1.54"

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 April
Key West, FL

Average rainfall days in April - Key West, FL
  • Average rainfall days in April: 13.4 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 April
Key West, FL

Average sea temperature in April - Key West, FL
  • Average sea temperature in April: 77.7°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 April /
Average sunshine in April
Key West, FL

Average daylight in April / Average sunshine in April - Key West, FL
  • Average daylight in April: 12h and 4min

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 April: 9h and 4min

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 April
Key West, FL

Average sunshine days in April - Key West, FL
  • Average sunshine days in April: 13.6 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 April
Key West, FL

Average UV index in April - Key West, FL
  • Average UV index in April: 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 April
Key West, FL

Average cloud cover in April - Key West, FL
  • Average cloud cover in April: 23

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 April
Key West, FL

Average visibility in April - Key West, FL
  • Average visibility in April: 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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