The highest day temperature in January 2026 was 85°F. The lowest night temperature was 37°F. The average values for day and night temperatures during January were 71.8°F и 56.9°F respectivly.

The average sea surface temperature in January 2026 for Siesta Key was 67.1°F. The maximum and minimum values were 62.4°F and 71.4°F respectively.

Most of the days in January are sunny but you can also expect cloudy and gloomy days.

Precipitation total in January for Siesta Key is 0.4 in. It makes january the least rainy month of the year.

The average wind speed in January is 10.4 mph. It makes January one of the most windy months of the year for Siesta Key.

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 Siesta Key in January is 6.8 hours.