Monarch Beach, CA Weather Forecast
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Monarch Beach Weather Forecast
| TODAY | TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT |
| Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Mostly Clear | Partly Cloudy | Clear | Mostly Sunny | Clear |
| Hi: 78°FHi: 26°C | Lo: 66°FLo: 19°C | Hi: 76°FHi: 24°C | Lo: 64°FLo: 18°C | Hi: 79°FHi: 26°C | Lo: 63°FLo: 17°C | Hi: 77°FHi: 25°C | Lo: 63°FLo: 17°C | Hi: 76°FHi: 24°C | Lo: 64°FLo: 18°C | Hi: 80°FHi: 27°C | Lo: 66°FLo: 19°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 1221 AM PDT Sun Sep 13 2026 

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Issued: 1051 AM PDT Sun Sep 13 2026
Discussion
...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES...
...UPDATED AVIATION DISCUSSION...
The 00z San Diego sounding shows a well mixed marine layer in the lowest 2,000 feet of the atmosphere with a strong inversion above it. Nighttime satellite imagery also shows this as tonight`s clouds are filled in over a very broad extent, from over the coastal waters up to 20 miles inland throughout SD County and Orange Co...
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