Key West Weather in January
Despite January being the year's coldest month for Key West, Florida, the island still enjoys idyllic weather. Temperatures are warm and the days are mostly sunny.
This page gives detailed information on the typical January temperature, precipitation, sun, humidity, wind and storms for Key West. The numbers here are historical averages based on climate data gathered at the Key West International Airport, located on Key West Island.
|76 °F||January average high||24 °C|
|66 °F||January average low||19 °C|
January is the coldest month overall for Key West and the 12th to 20th are its chilliest days. That's when the daily maximum temperature averages 76 degrees Fahrenheit (24 degrees Celsius) and the minimum is 65 °F (18 °C).
|26 days||70 °F max. or more (21 °C)|
|7 days||60 °F min. or less (16 °C)|
Key West averages eight days in January when the thermometer reaches into the 80s °F (over 26 °C). Temperatures above 90 °F (32 °C) are not expected here this month.
The thermometer dips to 50 °F (10 °C) or below on an average of one night this month. But January does not normally get as cold as 40 °F (4 °C).
|1.8 in||total precipitation||46 mm|
|7 days||of rain|
Half the time, Key West receives 0.6 to 2.4 inches (14 to 61 mm) of rainfall in January. One in four years has drier weather, while another one in four is wetter.
|11 days||clear skies|
The sun's rays reach the ground in Key West during 74 percent of daylight hours on average in January, for a total of 248 hours in the month. Typically on 11 days this month the sky is mainly clear, with at most 30 percent cloud cover.
Sunlight in January at Key West lasts for 10 hours and 49 minutes a day on average. The shortest day of the month is the 1st with 10 hours and 39 minutes of daylight. By the end of the month, the days have lengthened to 11:03 from sunrise to sunset. These durations can vary by a minute or two from year to year.
|76 %||January average humidity|
The relative humidity in Key West during January usually peaks at 81 percent in the morning then drops to 69 percent by early afternoon.
|Local Time||1 am||4 am||7 am||10 am||1 pm||4 pm||7 pm||10 pm||Humidity %||80||81||81||74||69||69||76||78|
|11.7 mph||January wind speed average||18.8 kph|
January is a little windier than most other months in Key West.
|1 day||rainfall of 0.5 inches (13 mm) or more|
|1 day||with thunderstorms in January|
The weather data here are long-term averages provided by the US National Centers for Environmental Information (NCEI). Temperature and precipitation are 1991-2020 normals while humidity and thunderstorms are 1961-1990 normals.