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

April 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
April has perfect weather in the range of 72°F (22.2°C) to 82°F (27.8°C) with little rain and the least amount of humidity of the year at 70%. Key West is sunny with long days during this period, and there is no dearth of outdoor activities for the tourists.
April is an excellent time to hop onto one of the sailing tours or cruises and watch the dolphins in their natural environment. Take a sunset tour and head to Mallory Square to catch the most breath-taking sunset at the end of the day!
  • The average high temperature in April: 27.4°C

The warmest month (with the highest average high temperature) is August (31.9°C).
The month with the lowest average high temperature is January (23.5°C).

  • The average low temperature in April: 22°C

The month with the highest average low temperature is July (26.6°C).
The coldest month (with the lowest average low temperature) is January (17.9°C).

  • The average humidity in April: 70.1%

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

  • The average rainfall in April: 46mm

The wettest month (with the highest rainfall) is September (166mm).
The driest month (with the lowest rainfall) is March (40mm).

  • The average rainfall days in April: 4.5 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).

  • The average sea temperature in April: 25.4°C

The best month for swimming (with the highest average sea temperature) is August (30.5°C).
Coldest months (with the lowest average sea temperature) are January and February (21.8°C).

  • The average daylight in April: 13h

The month with the longest days is June (Average daylight: 14h).
Months with shortest days are January, February, November and December (Average daylight: 11h).

  • The average sunshine in April: 10.8h

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

  • The average UV index in April: 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).