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Waterman Percolation Basins Weather Forecast
| TODAY | TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT |
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| Chance of T-Storm | Chance of Showers | Chance of Showers | Chance of Showers | Mostly Sunny | Clear | Mostly Sunny | Mostly Clear | Mostly Sunny | Mostly Clear | Mostly Sunny | Partly Cloudy |
| Hi: 66°FHi: 19°C | Lo: 53°FLo: 12°C | Hi: 68°FHi: 20°C | Lo: 52°FLo: 11°C | Hi: 76°FHi: 24°C | Lo: 55°FLo: 13°C | Hi: 80°FHi: 27°C | Lo: 56°FLo: 13°C | Hi: 80°FHi: 27°C | Lo: 56°FLo: 13°C | Hi: 80°FHi: 27°C | Lo: 57°FLo: 14°C |
| POP: 50% | POP: 20% | POP: 20% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 450 AM PDT Thu Oct 22 2026 
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Issued: 449 AM PDT Thu Oct 22 2026
Discussion
...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES...
...UPDATED AVIATION DISCUSSION...
.SHORT TERM (Today through Saturday)... Rainfall that has occurred across southwestern California since Wednesday afternoon through midnight has been from bands of showers with rainfall quite variable from the coast to the mountains. Some locations have received less than 0.10 inch of rainfall. A lot of areas have had 0.25 ...