Costa Mesa Weather in December
Costa Mesa in December averages 19°C (66°F) during the day and 9°C (48°F) at night. This is the wettest month of the year.
Rainfall in Costa Mesa in December
As the month with the highest rainfall, make sure to have an umbrella to manage the showers. On average, there are about 7 days with rain during this month, averaging 55 mm (2.2 in). Rainfall intensity is on the higher side this month. Expect more substantial showers rather than light, passing rain.
Temperature in Costa Mesa in December
In December, expect pleasant temperatures in Costa Mesa, with highs of 19°C (66°F) and lows of 9°C (48°F) at night. Conditions are often most pleasant around the middle of the day. At 9°C (48°F) overnight, it gets properly cold after dark. On the bright side, cold nights tend to make for excellent sleeping conditions. While this is the time of year with slightly cooler averages, it remains comfortably warm.
Sunshine in Costa Mesa in December
Expect a lot of sunshine this month, with about 205 hours of sun. These sunny conditions add to the overall experience.Our weather planner can help you find worldwide destinations with pleasant weather during this period. January, February, March, April, May, June, July, August, September, October and November typically offer the best weather for Costa Mesa.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Costa Mesa's climate page.
Costa Mesa Temperature in December
Min Temperature
9°C (48°F)
Max Temperature
19°C (66°F)
Chance of Rain
24%
Precipitation
55 mm (2.2 in)
Rainy days
7 days
Sunshine
205 hours *
Percentage Sunshine
*
Best Places in the United States of America in December
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in December →
perfect weather
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tolerable
unpleasant
poor
What to Wear in Costa Mesa in December
Pleasant temperatures in December mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Rain gear is recommended, you can expect wet weather on multiple days. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.What To Do in Costa Mesa in December
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Costa Mesa's climate page.
See the full Costa Mesa climate overview or explore weather in the United States of America.
