Johnstone Dam, ND Weather Forecast
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Johnstone Dam Weather Forecast
| REST OF TODAY | TONIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT |
| Chance of T-Storm | Showers | Chance of Showers | Chance of Showers | Mostly Sunny | Partly Cloudy | Mostly Sunny | Increasing Clouds | Sunny | Increasing Clouds | Mostly Sunny | Mostly Clear |
| Hi: 61°FHi: 16°C | Lo: 49°FLo: 9°C | Hi: 59°FHi: 15°C | Lo: 45°FLo: 7°C | Hi: 69°FHi: 21°C | Lo: 49°FLo: 9°C | Hi: 75°FHi: 24°C | Lo: 51°FLo: 11°C | Hi: 79°FHi: 26°C | Lo: 51°FLo: 11°C | Hi: 81°FHi: 27°C | Lo: 51°FLo: 11°C |
| POP: 60% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1106 AM MDT Sat Sep 19 2026 

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Issued: 1251 PM CDT Sat Sep 19 2026
Key Messages
- Cloudy, humid, and cool today.
- Rain chances increase south and west of the Missouri River today, then medium to high rain chances remain tonight and through the day Sunday, before tapering Sunday night.
- Seasonable temperatures through early next week, with highs mostly in the 60s and 70s.
Discussion
... Issued at 207 AM CDT Sat Sep 19 2026
An upper level lower pressure system currently spinning over Idaho, will move into Wyoming this evening, and eventually into western South Dakota by ...
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