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City of San Marcos, CASan Marcos, CA Weather Forecast
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San Marcos Weather Forecast
| TODAY | TONIGHT | COLUMBUS DAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT |
 | | |  |  |  |  | | | | | |
| Showers | Chance of Showers | Showers | Chance of Showers | Chance of Showers | Mostly Clear | Sunny | Clear | Sunny | Clear | Sunny | Clear |
| Hi: 71°FHi: 22°C | Lo: 55°FLo: 13°C | Hi: 68°FHi: 20°C | Lo: 51°FLo: 11°C | Hi: 71°FHi: 22°C | Lo: 51°FLo: 11°C | Hi: 76°FHi: 24°C | Lo: 55°FLo: 13°C | Hi: 84°FHi: 29°C | Lo: 60°FLo: 16°C | Hi: 90°FHi: 32°C | Lo: 65°FLo: 18°C |
| POP: 70% | POP: 70% | POP: 50% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 233 AM PDT Sun Oct 11 2026 
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Issued: 1037 AM PDT Sun Oct 11 2026
Discussion
...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES...
...UPDATED AVIATION DISCUSSION...
The low level circulation associated with Post-TS Rachel has moved well to the north into the Mojave Desert, moving much faster than the models anticipated. As a result, most of the strongest winds and widespread rainfall is now behind us. West winds are still expected to be elevated at times for coastal and foothill areas ...