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Lake O'Neill, CA Weather Forecast
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Lake O'Neill Weather Forecast
| TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY |
 |  | | | | | | | | | | |
| Mostly Clear | Sunny | Clear | Mostly Sunny | Clear | Mostly Sunny | Clear | Mostly Sunny | Mostly Clear | Mostly Sunny | Clear | Mostly Sunny |
| Lo: 66°FLo: 19°C | Hi: 103°FHi: 39°C | Lo: 71°FLo: 22°C | Hi: 104°FHi: 40°C | Lo: 69°FLo: 21°C | Hi: 104°FHi: 40°C | Lo: 74°FLo: 23°C | Hi: 99°FHi: 37°C | Lo: 73°FLo: 23°C | Hi: 99°FHi: 37°C | Lo: 73°FLo: 23°C | Hi: 99°FHi: 37°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 125 PM PDT Thu Oct 01 2026 
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Issued: 548 PM PDT Thu Oct 1 2026
Discussion
...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES...
...UPDATED AVIATION DISCUSSION...
A building strong high pressure today will center itself over southern NV and northern AZ this weekend. Easterly flow aloft will allow for periods of offshore winds through the weekend, especially in San Diego County. This will amplify already hot and dry conditions in the coastal basin. Model guidance suggests 500 mb heigh...