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MacArthur Park Montclair Weather Forecast
| TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY |
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| Patchy Fog | Chance of Showers | Chance of T-Storm | Chance of T-Storm | Chance of Showers | Partly Cloudy | Mostly Clear | Sunny | Clear | Mostly Sunny | Partly Cloudy | Partly Cloudy |
| Lo: 58°FLo: 14°C | Hi: 78°FHi: 26°C | Lo: 58°FLo: 14°C | Hi: 68°FHi: 20°C | Lo: 52°FLo: 11°C | Hi: 72°FHi: 22°C | Lo: 52°FLo: 11°C | Hi: 77°FHi: 25°C | Lo: 55°FLo: 13°C | Hi: 79°FHi: 26°C | Lo: 57°FLo: 14°C | Hi: 81°FHi: 27°C |
| POP: 50% | POP: 70% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1150 AM PDT Tue Oct 20 2026 
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Issued: 119 PM PDT Tue Oct 20 2026
Discussion
...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES...
This afternoon...Skies are partly cloudy with only a few low clouds off the coast, some mid and high clouds streaming in from the southwest and cumulus clouds developing over the mountains. Isolated showers over the mtns this afternoon can`t be ruled out but the chances are very low. Temperatures are generally a few degrees lower than at this time yesterda...