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Stone Reservoir Weather Forecast
| TODAY | TONIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT |
 |  |  |  | | | | |  | | | |
| Patchy Fog | Partly Cloudy | Partly Cloudy | Mostly Clear | Partly Cloudy | Mostly Clear | Partly Cloudy | Mostly Clear | Mostly Sunny | Mostly Clear | Mostly Sunny | Mostly Clear |
| Hi: 92°FHi: 33°C | Lo: 64°FLo: 18°C | Hi: 95°FHi: 35°C | Lo: 65°FLo: 18°C | Hi: 97°FHi: 36°C | Lo: 66°FLo: 19°C | Hi: 98°FHi: 37°C | Lo: 67°FLo: 19°C | Hi: 100°FHi: 38°C | Lo: 68°FLo: 20°C | Hi: 100°FHi: 38°C | Lo: 68°FLo: 20°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 1210 AM PDT Sat Aug 15 2026 
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Stone Reservoir Forecast Discussion
Issued: 131 AM PDT Sat Aug 15 2026
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...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES...
Marine layer low clouds have spread into parts of the valleys this morning with otherwise mostly clear skies. Low clouds will continue to move into the inland valleys through sunrise, then retreat to the coast by late morning. Mid-level flow turns slightly m...