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City of San Marcos, CASan Marcos, CA Weather Forecast
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San Marcos Weather Forecast
| TONIGHT | COLUMBUS DAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY |
 | |  |  |  |  | | | | | | |
| Showers | Showers | Chance of Showers | Partly Cloudy | Mostly Clear | Mostly Sunny | Clear | Sunny | Clear | Sunny | Mostly Clear | Mostly Sunny |
| Lo: 55°FLo: 13°C | Hi: 70°FHi: 21°C | Lo: 51°FLo: 11°C | Hi: 74°FHi: 23°C | Lo: 51°FLo: 11°C | Hi: 78°FHi: 26°C | Lo: 55°FLo: 13°C | Hi: 86°FHi: 30°C | Lo: 61°FLo: 16°C | Hi: 91°FHi: 33°C | Lo: 66°FLo: 19°C | Hi: 89°FHi: 32°C |
| POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 118 PM PDT Sun Oct 11 2026 
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Issued: 110 PM PDT Sun Oct 11 2026
Discussion
...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES...
Rachel`s remnants brought widespread rainfall across the region. Valleys and coastal areas west of the mountains saw near one half inch to over 2 inches of rainfall in total, with mountain areas receiving 3-5"+ of rainfall. Current radar mosaic depicts light showers weakening over the area. Low level cumulus will continue to funnel in off the ocean through...