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Ostby Weather Forecast
| REST OF TODAY | TONIGHT | LABOR DAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT |
 |  |  | |  |  |  |  | |  | | |
| Chance of T-Storm | Chance of T-Storm | Thunderstorms | Chance of T-Storm | Windy | Chance of Showers | Mostly Sunny | Mostly Clear | Sunny | Increasing Clouds | Mostly Sunny | Chance of Showers |
| Hi: 81°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 75°FHi: 24°C | Lo: 55°FLo: 13°C | Hi: 69°FHi: 21°C | Lo: 50°FLo: 10°C | Hi: 69°FHi: 21°C | Lo: 49°FLo: 9°C | Hi: 79°FHi: 26°C | Lo: 51°FLo: 11°C | Hi: 65°FHi: 18°C | Lo: 45°FLo: 7°C |
| POP: 30% | POP: 50% | POP: 30% | POP: 40% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 336 PM CDT Sun Sep 06 2026 
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Issued: 332 PM CDT Sun Sep 6 2026
Key Messages
- Moderate to high chances for showers and thunderstorms will remain tonight through Labor Day. Isolated to scattered severe thunderstorms are possible.
- Unseasonably warm and humid through the Labor Day, then trending cooler.
- Windy on Tuesday, with near-critical to critical fire weather conditions across southwest and south central North Dakota.
Discussion
... Issued at 332 PM CDT Sun Sep 6 2026
A general unsettled pattern to bring isolated to scattered thunderstorms, possibly severe, thr...