The highest day temperature in December 2025 was 87°F. The lowest night temperature was 63°F. The average values for day and night temperatures during December were 79.2°F и 71.6°F respectivly.

The average sea surface temperature in December 2025 for Rio Grande was 79.2°F. The maximum and minimum values were 75.2°F and 85.4°F respectively.

Most of the days in December are cloudy but you can also expect sunny or gloomy days.

Precipitation total in December for Rio Grande is 1.3 in.

The average wind speed in December is 12.8 mph. This value is relatively stable throughout the year.

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 Rio Grande in December is 8.1 hours.