Weather WorldUpper Oso Reservoir, CA Weather Forecast
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Upper Oso Reservoir Weather Forecast
| TODAY | TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT |
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| Patchy Fog | Patchy Fog | Patchy Fog | Patchy Fog | Patchy Fog | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Mostly Clear | Partly Cloudy | Partly Cloudy |
| Hi: 89°FHi: 32°C | Lo: 66°FLo: 19°C | Hi: 83°FHi: 28°C | Lo: 63°FLo: 17°C | Hi: 87°FHi: 31°C | Lo: 64°FLo: 18°C | Hi: 88°FHi: 31°C | Lo: 64°FLo: 18°C | Hi: 88°FHi: 31°C | Lo: 65°FLo: 18°C | Hi: 90°FHi: 32°C | Lo: 67°FLo: 19°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 1243 AM PDT Sun Aug 30 2026 
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Issued: 224 AM PDT Sun Aug 30 2026
Discussion
...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES...
...UPDATED AVIATION DISCUSSION...
Patchy low clouds are developing over the coastal areas and far western valleys this morning with just a few high clouds elsewhere. Marine layer low clouds will continue to develop through the morning with the greatest coverage in San Diego County, then clear by late morning.
Satellite water vapor imagery shows an upper leve...