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Weather extremes
How extreme does Costa Mesa's weather get?
The hottest, coldest, wettest and snowiest days Costa Mesa has recorded — the outer limits of what its weather can do, and how far they sit beyond a normal day.
The four kinds of extreme
The hottest, coldest, wettest and snowiest single days Costa Mesa has recorded — each shown against what a normal day that time of year looks like.
That is about 30°F hotter than a normal September afternoon in Costa Mesa (typical high near 80°F).
The three most extreme on record
About 40°F colder than a normal March night in Costa Mesa (typical low near 52°F).
The three most extreme on record
More rain in a single day than Costa Mesa usually gets in the whole month of December (typical December total about 2.0 in).
The three most extreme on record
How hot and cold it gets, month by month
The shaded band is the normal range of daily temperatures for each month. The dots show the most extreme it has ever been — so you can see how far beyond a normal day the records really sit.
Costa Mesa's record heat sits well above even a hot day for the season — September's 110°F is about 30°F beyond a normal hot afternoon. Its record cold is just as far below a normal winter night — the dots mark how rare each extreme really is.
In plain terms
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Santa Ana Fire Stn (NOAA GHCN station USC00047888), about 12 km from the city centre.