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Keiller Park Weather Forecast
| TODAY | TONIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT |
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| Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Becoming Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy |
| Hi: 79°FHi: 26°C | Lo: 62°FLo: 17°C | Hi: 78°FHi: 26°C | Lo: 62°FLo: 17°C | Hi: 76°FHi: 24°C | Lo: 64°FLo: 18°C | Hi: 76°FHi: 24°C | Lo: 63°FLo: 17°C | Hi: 76°FHi: 24°C | Lo: 63°FLo: 17°C | Hi: 81°FHi: 27°C | Lo: 65°FLo: 18°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 1135 PM PDT Fri Sep 18 2026 
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Issued: 151 AM PDT Sat Sep 19 2026
Discussion
...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES...
The 00z sounding Friday afternoon shows a well mixed marine boundary layer, around 3000 feet deep. Low clouds will be patchy overnight through the coastal basin and scatter out to the coast between 8-11 AM this morning.
While the coastal basin will maintain modest minimum relative humidity values (30-60% inland, 60-80% coast) this afternoon, conditions will...