The highest day temperature in January 2026 was 82°F. The lowest night temperature was 70°F. The average values for day and night temperatures during January were 78.5°F и 76.5°F respectivly.

The average sea surface temperature in January 2026 for Cayo Guillermo was 80.7°F. The maximum and minimum values were 78.2°F and 83.6°F respectively.

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

Precipitation total in January for Cayo Guillermo is 1.2 in.

The average wind speed in January is 13.2 mph.

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 Cayo Guillermo in January is 6.1 hours.