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Thirteenth Street Reservoir, CA Weather Forecast
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Thirteenth Street Reservoir Weather Forecast
| TODAY | TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT |
 |  |  |  | | | | | | | | |
| Partly Cloudy | Partly Cloudy | Mostly Sunny | Mostly Clear | Mostly Sunny | Clear | Mostly Sunny | Mostly Clear | Mostly Sunny | Mostly Clear | Mostly Sunny | Mostly Clear |
| Hi: 102°FHi: 39°C | Lo: 69°FLo: 21°C | Hi: 101°FHi: 38°C | Lo: 69°FLo: 21°C | Hi: 101°FHi: 38°C | Lo: 69°FLo: 21°C | Hi: 100°FHi: 38°C | Lo: 69°FLo: 21°C | Hi: 101°FHi: 38°C | Lo: 70°FLo: 21°C | Hi: 101°FHi: 38°C | Lo: 71°FLo: 22°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 1232 AM PDT Thu Aug 20 2026 
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Issued: 121 AM PDT Thu Aug 20 2026
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...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES...
.SHORT TERM (Today through Saturday)... Monsoonal moisture will increase for today into Friday, then decrease during the weekend. There is a slight chance of afternoon showers and thunderstorms for the mountains and deserts for today and Friday with decreasing chances on Saturday.
High temperatures around 4 to 8 degrees above a...