Costa Mesa, CA Weather & Climate Normals
What a normal year in Costa Mesa actually looks like
On the 30-year record NOAA keeps for Costa Mesa, CA, the comfort score comes out to 93/100, very mild year-round: Many months fall in a comfortable temperature range with limited snow or seasonal extremes. Only 12 months a year land in the 55–75°F range this site treats as mild.
How much Costa Mesa's weather actually swings
Average temperatures in Costa Mesa run from 57°F in Dec up to 74°F in Aug, a 16.4°F seasonal swing, one of the smaller gaps in this dataset.
How wet Costa Mesa actually gets
Costa Mesa averages 11.18in of precipitation a year across roughly 41 days with measurable rain or snow; the nearest NOAA station does not record snowfall, so no snow figure is shown rather than guessed.
Costa Mesa against the rest of the country
Out of 4876 cities scored here, Costa Mesa comes in at 42; within CA alone it ranks 42 of 429. Population is about 109,131.
Checking the actual forecast
These figures come from SANTA ANA JOHN WAYNE AP, CA US, the NOAA station 2.8 miles from Costa Mesa, averaged over 30 years, not tomorrow's forecast.
More on how this is worked out
Why some cities show no snow or rain figure · Why this uses the nearest NOAA station