Costa Mesa Weather in March

The climate in Costa Mesa during March can be summarized as mild and reasonably dry.

March is in the spring in Costa Mesa and is typically the 4th coldest month of the year. Daytime maximum temperatures average around 19°C (65°F), whilst at night 9°C (49°F) is normal.

On average March is the 3rd wettest month of the year in Costa Mesa with around 49mm 1.9 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 6 days, although this may vary considerably.

On the flip side this corresponds to an average of 9.1 hours of sunshine per day.

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Costa Mesa in March 2024.