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Riverside Weather Forecast
| TODAY | TONIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT |
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| Partly Sunny | Partly Cloudy | Chance of Rain | Chance of T-Storm | Chance of Rain | Mostly Cloudy | Mostly Cloudy | Mostly Cloudy | Partly Sunny | Chance of Showers | Chance of Showers | Chance of Showers |
| Hi: 69°FHi: 21°C | Lo: 51°FLo: 11°C | Hi: 65°FHi: 18°C | Lo: 51°FLo: 11°C | Hi: 65°FHi: 18°C | Lo: 49°FLo: 9°C | Hi: 61°FHi: 16°C | Lo: 45°FLo: 7°C | Hi: 61°FHi: 16°C | Lo: 45°FLo: 7°C | Hi: 61°FHi: 16°C | Lo: 45°FLo: 7°C |
| POP: 100% | POP: 100% | POP: 20% | POP: 30% | POP: 30% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 703 AM EDT Sat Sep 19 2026 
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Issued: 700 AM EDT Sat Sep 19 2026
Key Messages
1) Widespread rain with isolated thunder Sunday into Sunday night. Marginal flood threat.
2) Breezy and cool conditions likely mid to late next week, with periods of unsettled weather possible. Potential for minor to moderate coastal flood and shoreline impacts mid to late next week.
Discussion
... .KEY MESSAGE 1... Frontal system with wave of low pressure for the close of this weekend will eventually settle to the south of the region into early next week. Potential for heavy rain Sunda...