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.

Temperature Weather iconTemperature

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).

Rainy Weather iconRain

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.

Sunny Weather iconSun

74 % sunshine
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.

Humid Weather iconHumidity

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 Time1 am4 am7 am10 am1 pm4 pm7 pm10 pm
Humidity % 80 81 81 74 69 69 76 78

Windy Weather iconWind

11.7 mph January wind speed average 18.8 kph

January is a little windier than most other months in Key West.

Stormy Weather iconStorms

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.

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