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San Marin Weather Forecast
| TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | LABOR DAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY |
 |  |  | |  |  | | | | | | |
| Partly Cloudy | Partly Cloudy | Mostly Clear | Partly Cloudy | Chance of Showers | Chance of Showers | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy |
| Lo: 64°FLo: 18°C | Hi: 75°FHi: 24°C | Lo: 64°FLo: 18°C | Hi: 78°FHi: 26°C | Lo: 68°FLo: 20°C | Hi: 78°FHi: 26°C | Lo: 67°FLo: 19°C | Hi: 78°FHi: 26°C | Lo: 68°FLo: 20°C | Hi: 79°FHi: 26°C | Lo: 68°FLo: 20°C | Hi: 80°FHi: 27°C |
| POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1226 PM PDT Thu Sep 03 2026 
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Instant definitions for any meteorological term.
Issued: 516 PM PDT Thu Sep 3 2026
Discussion
...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES...
...UPDATED AVIATION DISCUSSION...
Today through Saturday...
Seasonably cool weather continues across the region with the upper level ridge displaced to the southeast US by a large trough across the West Coast. This large-scale trough features a strong upper low currently off the WA/OR coast. Consistent model guidance progs this feature to maintain intensity,...