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Lewiston Weather Forecast
| TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY |
 |  |  | |  |  |  |  | |  | |  |
| Clear | Mostly Sunny | Chance of T-Storm | Mostly Sunny | Partly Cloudy | Chance of Showers | Chance of Showers | Chance of T-Storm | Chance of T-Storm | Mostly Cloudy | Partly Cloudy | Chance of Showers |
| Lo: 59°FLo: 15°C | Hi: 79°FHi: 26°C | Lo: 65°FLo: 18°C | Hi: 75°FHi: 24°C | Lo: 51°FLo: 11°C | Hi: 69°FHi: 21°C Lo: 51°FLo: 11°C | Hi: 69°FHi: 21°C Lo: 51°FLo: 11°C | Hi: 71°FHi: 22°C | Lo: 59°FLo: 15°C | Hi: 69°FHi: 21°C | Lo: 50°FLo: 10°C | Hi: 65°FHi: 18°C |
| POP: 50% | POP: 50% | POP: 50% | POP: 80% | POP: 70% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 342 PM CDT Thu Sep 10 2026 
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Issued: 150 PM CDT Thu Sep 10 2026
Key Messages
- Shower and storm chances return Friday night into Saturday morning (30 to 60%). Severe potential is low (<10%) with these storms.
- Widespread rain is likely Monday (70 to 90%) with some potential (15%) for heavy rain and localized flooding concerns.
Discussion
... Issued at 150 PM CDT Thu Sep 10 2026
Thunderstorm potential returns Friday night
Friday into Saturday, upper low churning over northern Saskatchewan should usher a weak front south through the CWA. As this occurs, disturbance within the quasi-zonal flo...