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San Antonio Park Upland, CA Weather Forecast
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San Antonio Park Upland Weather Forecast
| TONIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY |
 |  | | |  |  | | | | |  |  |
| Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Mostly Clear | Mostly Sunny | Clear | Mostly Sunny | Mostly Clear | Mostly Sunny | Chance of Showers | Chance of Showers |
| Lo: 74°FLo: 23°C | Hi: 107°FHi: 42°C | Lo: 73°FLo: 23°C | Hi: 104°FHi: 40°C | Lo: 72°FLo: 22°C | Hi: 102°FHi: 39°C | Lo: 67°FLo: 19°C | Hi: 96°FHi: 36°C | Lo: 63°FLo: 17°C | Hi: 92°FHi: 33°C | Lo: 63°FLo: 17°C | Hi: 92°FHi: 33°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 1140 AM PDT Wed Aug 26 2026 
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Issued: 117 PM PDT Wed Aug 26 2026
Discussion
...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES...
This afternoon...Mid and high clouds moving into San Diego County from the south could produce isolated light showers and possibly a tstm or two over the next several hours, mainly in the mountains but a few light showers could develop over the valleys and coastal areas. Temperatures are mostly a few degrees higher than at this time yesterday.
Through frida...