Plain, WA Weather Forecast
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| TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | LABOR DAY | MONDAY NIGHT | TUESDAY | WEDNESDAY | THURSDAY |
| Chance of Showers | Chance of T-Storm | Chance of Showers | Chance of T-Storm | Chance of Showers | Partly Cloudy | Chance of Showers | Chance of Showers | Chance of Showers | Partly Cloudy | Partly Cloudy | Partly Cloudy |
| Lo: 45°FLo: 7°C | Hi: 65°FHi: 18°C | Lo: 47°FLo: 8°C | Hi: 66°FHi: 19°C | Lo: 46°FLo: 8°C | Hi: 70°FHi: 21°C | Lo: 50°FLo: 10°C | Hi: 66°FHi: 19°C Lo: 50°FLo: 10°C | Hi: 66°FHi: 19°C Lo: 50°FLo: 10°C | Hi: 76°FHi: 24°C Lo: 59°FLo: 15°C | Hi: 76°FHi: 24°C Lo: 59°FLo: 15°C | Hi: 76°FHi: 24°C Lo: 59°FLo: 15°C |
| POP: 50% | POP: 50% | POP: 50% | POP: 50% | POP: 40% | POP: 30% | POP: 20% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 207 PM PDT Thu Sep 03 2026 

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Issued: 447 PM PDT Thu Sep 3 2026
Key Messages
- Cool and showery weather expected through Labor Day Weekend with isolated thunderstorms.
- A warming and drying trend returns around the middle of next week.
Discussion
... Thursday night through Monday: A closed upper level low continues to spin along the WA/OR coast, keeping the Inland Northwest in an active pattern through Labor Day Weekend with periodic showers and cooler than normal temperatures. A shortwave pivoting around the low Thursday evening into early Friday will bring a mor...
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