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Arnold Heights, CA Weather Forecast
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Arnold Heights Weather Forecast
| TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY |
 |  | |  |  | | | | |  | | |
| Mostly Clear | Mostly Sunny | Mostly Clear | Partly Cloudy | Partly Cloudy | Partly Cloudy | Mostly Clear | Mostly Sunny | Mostly Clear | Chance of Showers | Mostly Clear | Mostly Sunny |
| Lo: 69°FLo: 21°C | Hi: 103°FHi: 39°C | Lo: 70°FLo: 21°C | Hi: 102°FHi: 39°C | Lo: 70°FLo: 21°C | Hi: 101°FHi: 38°C | Lo: 69°FLo: 21°C | Hi: 99°FHi: 37°C | Lo: 69°FLo: 21°C | Hi: 98°FHi: 37°C | Lo: 68°FLo: 20°C | Hi: 98°FHi: 37°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 1151 AM PDT Tue Aug 18 2026 
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Arnold Heights Forecast Discussion
Issued: 1035 AM PDT Tue Aug 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 Thursday)... High temperatures will continue to warm a few degrees for today and Wednesday with not much change for Thursday. High temperatures for Wednesday and Thursday will be around 5 degrees above average for inland areas with high temperatures ranging from the m...