Weather WorldSimpson Park, CA Weather Forecast
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Simpson Park Weather Forecast
| TODAY | TONIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT |
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| Mostly Sunny | Partly Cloudy | Partly Cloudy | Patchy Fog | Patchy Fog | Patchy Fog | Patchy Fog | Mostly Clear | Partly Cloudy | Mostly Clear | Partly Cloudy | Partly Cloudy |
| Hi: 80°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 80°FHi: 27°C | Lo: 63°FLo: 17°C | Hi: 78°FHi: 26°C | Lo: 62°FLo: 17°C | Hi: 80°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 80°FHi: 27°C | Lo: 63°FLo: 17°C | Hi: 82°FHi: 28°C | Lo: 64°FLo: 18°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 1228 AM PDT Fri Sep 18 2026 
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Issued: 232 AM PDT Fri Sep 18 2026
Discussion
...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES...
...UPDATED AVIATION DISCUSSION...
.SHORT TERM (Today through Sunday)... Low pressure over California will weaken and move inland today with high pressure aloft moving inland across California on Saturday. A low pressure system will develop off the California coast on Sunday and move inland into California on Monday.
High temperatures will warm a few degrees ...