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Flat Lake, WA Weather Forecast
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Flat Lake Weather Forecast
| REST OF TODAY | TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | THURSDAY | FRIDAY | SATURDAY |
 | |  |  |  |  |  | | | |
| Rain Showers | Rain Showers | Partly Cloudy | Mostly Cloudy | Mostly Cloudy | Mostly Clear | Mostly Clear | Mostly Clear | Mostly Clear | Mostly Clear |
| Hi: 60°FHi: 16°C | Lo: 47°FLo: 8°C | Hi: 66°FHi: 19°C | Lo: 47°FLo: 8°C | Hi: 66°FHi: 19°C | Hi: 76°FHi: 24°C Lo: 46°FLo: 8°C | Hi: 76°FHi: 24°C Lo: 46°FLo: 8°C | Hi: 76°FHi: 24°C Lo: 46°FLo: 8°C | Hi: 80°FHi: 27°C Lo: 50°FLo: 10°C | Hi: 80°FHi: 27°C Lo: 50°FLo: 10°C |
| POP: 70% | POP: 70% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1133 AM PDT Sun Sep 13 2026 
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Issued: 1025 AM PDT Sun Sep 13 2026
Key Messages
- Widespread rain returns late Saturday night through Sunday. Most of the Inland Northwest has a 50-90% chance of receiving half an inch or more of rain with this system.
- Risk for debris flows and rock slides in Central Washington near sensitive burn scars and steep terrain.
- Isolated thunderstorms Saturday night into Sunday, especially for Eastern Washington and North Idaho.
- Gusty winds across the broader basin areas from Sunday morning through evening.
- Warming and drying trend Monday ...