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

January 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
January is a delightful month in the mild winter of Key West when the average temperatures are in a comfortable range of 65°F (18.3°C) to 75°F (23.9°C). Rain is not a showstopper in the dry season. The weather is pleasant with a multitude of outdoor activities at disposal. Winter is usually devoid of extremely low temperatures.
Beware - Key West is a small place, a collection of a few islands, and it gets crowded with enthusiastic tourists in the winter. January is a beautiful time to traverse the island on foot, enjoy the food and wine festival, and explore the various attractions with the ultraviolet index of the sun at a relative low of 6.
  • The average high temperature in January: 23.5°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 January: 17.9°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 January: 76%

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 January: 47mm

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 January: 6.2 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 January: 21.8°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 January: 11h

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 January: 8.1h

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 January: 6

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).