Costa Mesa, CA Weather Forecast
Right now it is 63°F and clear in Costa Mesa (as of Fri, 12:30 AM PST). Friday: high near 83°F. Tomorrow: sunny, high near 86°F. Official NWS forecast and alerts, refreshed every 30 minutes.
Current conditions
Measured at John Wayne-Orange County Airport (4 mi from the city center).
Weather tomorrow in Costa Mesa
Sunny86°FSunny, with a high near 86. North wind 5 to 10 mph.
Clear63°FClear, with a low around 63. North wind around 5 mph.
Weather alerts
1 active alertCoastal Flood Advisory until Nov 10, 12:00 PM PST
Coastal Flood Advisory issued November 5 at 9:30PM PST until November 10 at 12:00PM PST by NWS San Diego CA
* WHAT...Minor to locally moderate coastal flooding expected. Dangerous rip currents and elevated surf expected along west- facing beaches. * WHERE...San Diego County Coastal Areas and Orange County Coastal Areas. * WHEN...From 4 AM Friday to noon PST Tuesday. * IMPACTS...Flooding of lots, parks, and roads with only isolated road closures expected. * ADDITIONAL DETAILS...Highest tides will occur in the late morning each day, peaking at 7.4-7.6 feet Sunday and Monday, which is 1.3 to 1.6 feet above astronomical tide predictions. Surf will increase Monday.
What to do: If travel is required, allow extra time as some roads may be closed. Do not drive around barricades or through water of unknown depth. Take the necessary actions to protect flood-prone property.
NWS San Diego CA · Severity: Minor
7-day forecast
Clear59°FOvernight: Clear, with a low around 59. North wind around 5 mph.
Sunny83°F / 64°FSunny, with a high near 83. North wind 5 to 10 mph. Friday Night: Mostly clear, with a low around 64. North wind 5 to 10 mph.
Sunny86°F / 63°FSunny, with a high near 86. North wind 5 to 10 mph. Saturday Night: Clear, with a low around 63. North wind around 5 mph.
Sunny86°F / 65°FSunny, with a high near 86. Sunday Night: Mostly clear, with a low around 65.
Sunny83°F / 64°FSunny, with a high near 83. Monday Night: Partly cloudy, with a low around 64.
Sunny82°F / 63°FSunny, with a high near 82. Tuesday Night: Clear, with a low around 63.
Sunny82°F / 62°FSunny, with a high near 82. Wednesday Night: Mostly clear, with a low around 62.
Mostly Sunny
11% chance of rain/snow79°FMostly sunny, with a high near 79.
Forecast issued by NWS forecast office SGX · updated Nov 6, 12:53 AM PST. Daytime highs and overnight lows are on the right.
Hourly forecast, radar & more on weather.gov
Nearby cities
Costa Mesa population: 108,881 (U.S. Census Bureau, July 1, 2025 estimate). More California cities · All US cities
Source: National Weather Service / NOAA (public domain), fetched live. Tachlis is not affiliated with the NWS.
Questions & answers
What is the weather tomorrow in Costa Mesa?
Saturday, November 7: Sunny, high near 86°F; night: clear, low around 63°F.
Where does the Costa Mesa forecast come from?
From the National Weather Service forecast office SGX, which writes the official forecast for Costa Mesa's 2.5 km grid square. Current conditions come from the nearest NWS/FAA weather station.
How often is the Costa Mesa weather updated?
This page fetches fresh data from the National Weather Service at most every 30 minutes, and checks for new watches and warnings every 5 minutes.
What time zone are the times shown in?
Local time for Costa Mesa (America/Los Angeles).
Why can the current temperature differ from the forecast?
The current reading is a real measurement at a weather station, often at an airport, while the forecast describes the whole grid square around the city. Temperatures can differ by a few degrees across a city.