The highest day temperature in December 2025 was 86°F. The lowest night temperature was 48°F. The average values for day and night temperatures during December were 70.3°F и 54.8°F respectivly.

The average sea surface temperature in December 2025 for Irvine was 64.6°F. The maximum and minimum values were 63.6°F and 65.8°F respectively.

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

Precipitation total in December for Irvine is 0.7 in. It makes december the most rainy month of the year.

The average wind speed in December is 4.3 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 Irvine in December is 6.7 hours.