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Flat Lake Weather Forecast
| TODAY | TONIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | THURSDAY | THURSDAY NIGHT | FRIDAY |
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| Mostly Cloudy | Mostly Cloudy | Mostly Cloudy | Partly Cloudy | Mostly Sunny | Mostly Clear | Mostly Sunny | Mostly Clear | Partly Cloudy | Partly Cloudy | Mostly Clear | Mostly Sunny |
| Hi: 69°FHi: 21°C | Lo: 50°FLo: 10°C | Hi: 61°FHi: 16°C | Lo: 49°FLo: 9°C | Hi: 70°FHi: 21°C | Lo: 51°FLo: 11°C | Hi: 75°FHi: 24°C | Lo: 55°FLo: 13°C | Hi: 79°FHi: 26°C Lo: 55°FLo: 13°C | Hi: 79°FHi: 26°C Lo: 55°FLo: 13°C | Lo: 55°FLo: 13°C | Hi: 79°FHi: 26°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 401 AM MDT Sat Sep 19 2026 
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Issued: 222 AM MDT Sat Sep 19 2026
Key Messages
- Issued Flood Watch for today through Sunday for Petroleum, Garfield, Prairie, Dawson and Wibaux Counties. Heavy rain is likely south of MT 200 from Winnett to Glendive as well as south of I-94 through Wibaux. Embedded thunderstorms are possible and can cause local heavier rainfall.
- Little or no rain is expected north of the Missouri River today through Sunday with a sharp gradient in forecast rainfall totals between the Missouri River and MT 200.
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