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McCallum Trail Weather Forecast
| TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY |
 |  | | | | |  |  | | | | |
| Mostly Clear | Sunny | Mostly Clear | Mostly Sunny | Mostly Clear | Mostly Sunny | Chance of Showers | Chance of Showers | Mostly Clear | Sunny | Clear | Sunny |
| Lo: 66°FLo: 19°C | Hi: 90°FHi: 32°C | Lo: 67°FLo: 19°C | Hi: 88°FHi: 31°C | Lo: 66°FLo: 19°C | Hi: 86°FHi: 30°C | Lo: 63°FLo: 17°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 |
POP = Probability of Precipitation.
Weather Outlook Updated: 1123 AM PDT Sun Oct 18 2026 
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Issued: 532 PM PDT Sun Oct 18 2026
Discussion
...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES...
...UPDATED AVIATION DISCUSSION...
.SHORT TERM...Today Oct 18 through Tue Oct 20...Pretty big change in temperatures between today and yesterday; 24 hours ago temperatures were 5 to 12 degrees warmer in the coastal and valley areas and 3 to 9 degrees cooler for the mountains and deserts. The difference between this morning`s and yesterday`s low temperatures ...