Rain observed over the last two hours by official weather radars around Costa Mesa, followed by the radar forecast for the next hour where the weather service provides one.
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Rain radarLast two hours, then forecast where available · drag the timeline
Air you breathe in Costa Mesa: pollution and pollen
1/6
Good
European Air Quality Index (EAQI), from Copernicus CAMS
PM2.58µg/m³
PM109µg/m³
Copernicus CAMS model, updated several times a day.
Costa Mesa forecast in charts · next 7 days
The week ahead: highs and lows
▲ This week runs +4.7° warmer than usual
Highs Lows Usual for the season (1991–2020 average)
Hourly detail
Temperature (°C) Rain (mm) Wind (km/h)
Moon over Costa Mesa
Waning crescent
12 % illuminated · 26.3 days
Rise 03:47 Set 15:16
Sat7/116%
Sun8/112%
Mon9/110%
Tue10/111%New moon
Wed11/113%
Thu12/118%
Fri13/1115%
Sat14/1123%
Sun15/1133%
Mon16/1143%
Tue17/1154%First quarter
Wed18/1164%
Moonrise and moonset in local time (America/Los_Angeles); phase and lit fraction from a synodic calculation.
Heights above chart datum. Coefficient: 20 for the weakest tides, 120 for the strongest.
Look up a past day in Costa Mesa
Curious about the weather in Costa Mesa on a given day? Choose a date: we read it from the ERA5 reanalysis (ECMWF / Copernicus C3S), which runs until about a week ago.
Costa Mesa weather at a glance
This page gathers everything about the weather in Costa Mesa, California: conditions now, the forecast for each part of the day and the trend for the coming week. At the moment the sky is “clear sky”, it is 24 °C (feels like 25 °C) and the wind blows at 3 km/h.
Expected range today: 16 °C to 27 °C and a dry sky. The forecast comes from the AtmoAtlas engine, which combines ECMWF-AIFS, NOAA GFS and DWD ICON, adjusts cloud cover with METAR reports and uses convective energy (CAPE) to flag storms, plus the tide times for Costa Mesa.
Use the Costa Mesa forecast in your own website or app: one JSON call returns weather, air quality, tides and sun and moon times. The free key needs no card.
