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

March 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
The start of spring in March is the best time to visit Key West with the drop in tourist numbers and the temperatures averaging a warm 68°F (20°C) to 78°F (25.6°C).
It is a great time for swimming, boating, and kayaking with an average ocean temperature of 70°F (21.1°C). Do not miss snorkeling, as the Key West beaches are a paradise with one of the clearest waters and ample sunshine for 10 hours in March. The dry season is an excellent time for visitors to explore camping grounds and RV parks.
  • The average high temperature in March: 25.7°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 March: 20.2°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 March: 73%

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 March: 40mm

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 March: 5.8 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 March: 22.9°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 March: 12h

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 March: 10h

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 March: 10

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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