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Foothill Ranch Weather Forecast
| TODAY | TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT |
 |  | |  | |  | | |  | | | |
| Partly Cloudy | Partly Cloudy | Partly Cloudy | Patchy Fog | Patchy Fog | Mostly Clear | Partly Cloudy | Clear | Mostly Sunny | Mostly Clear | Partly Cloudy | Partly Cloudy |
| Hi: 81°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 80°FHi: 27°C | Lo: 60°FLo: 16°C | Hi: 80°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 82°FHi: 28°C | Lo: 62°FLo: 17°C | Hi: 83°FHi: 28°C | Lo: 62°FLo: 17°C | Hi: 80°FHi: 27°C | Lo: 61°FLo: 16°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 1212 AM PDT Tue Sep 15 2026 
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Issued: 1235 AM PDT Tue Sep 15 2026
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...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES...
.SHORT TERM (Today through Thursday)... A low pressure system moving southward along the West Coast into California will continue the cooling trend through Wednesday with Wednesday high temperatures a few degrees below average near the coast and in the lower deserts to 5 to 10 degrees below average for the Inland Empire. High temperatures on Wednesday will...