The highest day temperature in January 2026 was 80°F. The lowest night temperature was 61°F. The average values for day and night temperatures during January were 73.3°F и 70.8°F respectivly.

The average sea surface temperature in January 2026 for Key West was 75.3°F. The maximum and minimum values were 71.2°F and 78.2°F respectively.

You can expect various weather conditions during January. Be ready for sunny, cloudy or even gloomy days.

Precipitation total in January for Key West is 1.2 in. It makes january one of the least rainy months of the year.

The average wind speed in January is 13.8 mph. It makes January one of the most windy months of the year for Key West.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Key West in January is 6.2 hours.