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Costa Mesa, California Weather Forecast
Costa Mesa, California Weather
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Weather Forecast for Costa Mesa, California : Orange County
Issued: 2:24 am PST Dec 18, 2025 Latitude: 33.6411316 Longitude: -117.9186689 View on Google Maps

MouseOver for Detail Forecast
Today Tonight Friday Saturday Sunday Monday Tuesday Wednesday
Morning Fog on Today Morning Fog on Tonight Morning Fog on Friday Morning Fog on Saturday Morning Fog on Sunday Mostly Cloudy on Monday 20% chance of rain on Tuesday Rain on Wednesday
High: 74°F Low: 53°F High: 69°F High: 67°F High: 67°F High: 67°F High: 66°F High: 65°F
Low: 53°F Low: 52°F Low: 53°F Low: 53°F Low: 55°F  
Morning Fog Morning Fog Morning Fog Morning Fog Morning Fog Mostly Cloudy Rain Rain
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Current Conditions at
SANTA ANA - (KSNA)
54°
Partly Cloudy
Mist
as of 5:10 AM PST
Rel. Humidity: 87%
Dew Point: 50°F
Visibility: 6 Miles
Pressure: 29.94 in.
Flight Rule: VFR
Wind Data
3 MPH
080° East
Cloud Level(s): Scattered at 300ft
Current Conditions at
FULLERTON - (KFUL)
50°
Clear
Mist
as of 5:11 AM PST
Rel. Humidity: 93%
Dew Point: 48°F
Visibility: 3 Miles
Pressure: 29.94 in.
Flight Rule: MVFR
Wind Data
3 MPH
080° East
Cloud Level(s): Clear
Current Conditions at
LONG BEACH - (KLGB)
54°
Cloudy
Mist
as of 5:30 AM PST
Rel. Humidity: 100%
Dew Point: 54°F
Visibility: 1 1/2 Miles
Pressure: 29.95 in.
Flight Rule: LIFR
Wind Data
3 MPH
080° East
Cloud Level(s): Solid Overcast at 100ft
Morning Fog on Today Today... Patchy fog between 7am and 10am. Otherwise, sunny, with a high near 74. Calm wind becoming southwest around 5 mph in the afternoon.

Morning Fog on Tonight Tonight... Patchy fog after 4am. Otherwise, mostly clear, with a low around 53. Calm wind becoming south around 5 mph.

Morning Fog on Friday Friday... Patchy fog before 10am. Otherwise, mostly sunny, with a high near 69. Calm wind becoming southwest around 5 mph in the afternoon.

Patchy Fog on Friday Night Friday Night... Patchy fog after 10pm. Otherwise, partly cloudy, with a low around 53. Southwest wind around 5 mph becoming southeast after midnight.

Morning Fog on Saturday Saturday... Patchy fog before 10am. Otherwise, partly sunny, with a high near 67. South wind around 5 mph.

Patchy Fog on Saturday Night Saturday Night... Patchy fog after 10pm. Otherwise, increasing clouds, with a low around 52.

Morning Fog on Sunday Sunday... Patchy fog before 10am. Otherwise, mostly cloudy, with a high near 67.

Patchy Fog on Sunday Night Sunday Night... Patchy fog after 10pm. Otherwise, mostly cloudy, with a low around 53.

Mostly Cloudy on Monday Monday... Mostly cloudy, with a high near 67.

10% chance of rain Monday Night Monday Night... A slight chance of showers after 4am. Mostly cloudy, with a low around 53.

20% chance of rain Tuesday Tuesday... A chance of rain. Mostly cloudy, with a high near 66.

70% chance of rain Tuesday Night Tuesday Night... Rain likely. The rain could be heavy at times. Cloudy, with a low around 55.

Rain on Wednesday Wednesday... Rain. The rain could be heavy at times. Cloudy, with a high near 65.

Sun Almanac for Costa Mesa, California
Sunrise: 06:51 AM
Sunset: 4:46 PM
Civil Sunrise:06:23 AM
Civil Sunset: 5:14 PM
Nautical Sunrise: 05:52 AM
Nautical Sunset: 5:45 PM
Astro Sunrise: 05:22 AM
Astro Sunset: 6:15 PM
Any use of the information on this page is at your own risk. This information should not be relied upon in life-threatening situations, potential financial loss situations or in lieu of any officially disseminated information. Visit the National Weather Service for official information.