Costa Mesa has milder winters than most of California
Costa Mesa has warm winters and pleasant summers, with very little rain. A typical July afternoon reaches 78°, a January night drops to 48°, and snow is almost unheard of. A typical November afternoon reaches 73°, and nights fall to 52°.
Getting the latest forecast from the National Weather Service…
What stands out about Costa Mesa’s weather
Read from 30 years of NOAA records. Each one opens the full story on the Climate page.
Where today sits in Costa Mesa’s year
Typical highs and lows month by month, from 30 years of NOAA records.
Weather talk
Road reports, first frosts and storm memories from neighbors in Costa Mesa.
Your answer becomes a post in Town Square.
Forecast, conditions and alerts: National Weather Service. Climate: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000. Temperatures and rainfall come from NOAA’s gridded normals for Costa Mesa itself (about a 3-mile square). Snow, frost dates and day counts: the NOAA station at Santa Ana Fire Stn, CA (6 mi, snow) and Santa Ana John Wayne Airport, CA (3 mi, frost, heat and degree days). Sunrise and sunset are calculated from the town’s position. Normals are 30-year averages, not a forecast.