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City of San Marcos, CASan Marcos, CA Weather Forecast
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San Marcos Weather Forecast
| TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY |
 |  | |  |  | | | | | | | |
| Partly Cloudy | Partly Cloudy | Partly Cloudy | Chance of Showers | Patchy Fog | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy |
| Lo: 67°FLo: 19°C | Hi: 86°FHi: 30°C | Lo: 65°FLo: 18°C | Hi: 84°FHi: 29°C | Lo: 63°FLo: 17°C | Hi: 83°FHi: 28°C | Lo: 62°FLo: 17°C | Hi: 81°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 80°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 82°FHi: 28°C |
| POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1226 PM PDT Sun Aug 09 2026 
San Marcos Radar Loop
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