Weather WorldUpper Oso Reservoir, CA Weather Forecast
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Upper Oso Reservoir Weather Forecast
| TODAY | TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT |
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| Mostly Sunny | Patchy Fog | Patchy Fog | Patchy Fog | Patchy Fog | Partly Cloudy | Mostly Cloudy | Partly Cloudy | Chance of Showers | Chance of Showers | Chance of Showers | Chance of Showers |
| Hi: 81°FHi: 27°C | Lo: 57°FLo: 14°C | Hi: 76°FHi: 24°C | Lo: 57°FLo: 14°C | Hi: 75°FHi: 24°C | Lo: 57°FLo: 14°C | Hi: 73°FHi: 23°C | Lo: 58°FLo: 14°C | Hi: 71°FHi: 22°C | Lo: 57°FLo: 14°C | Hi: 70°FHi: 21°C | Lo: 56°FLo: 13°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 1204 AM PDT Mon Oct 26 2026 
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Issued: 949 PM PDT Sun Oct 25 2026
Discussion
...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES...
...UPDATED AVIATION DISCUSSION...
Visible satellite at 11 AM was showing clear skies across Southern California. Highs today are expected to be in the upper 70s to upper 80s for most locations, with spots in the mountains in the 50 to 60 degree range. The pressure gradient between San Diego and Tonopah, NV was still weakly offshore this morning. Onshore flo...