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| THIS AFTERNOON | TONIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT |
 |  |  |  |  | | |  | | | | |
| Mostly Sunny | Mostly Clear | Partly Cloudy | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Clearing | Partly Cloudy | Clearing | Mostly Clear | Mostly Sunny | Partly Cloudy |
| Hi: 89°FHi: 32°C | Lo: 59°FLo: 15°C | Hi: 85°FHi: 29°C | Lo: 61°FLo: 16°C | Hi: 89°FHi: 32°C | Lo: 61°FLo: 16°C | Hi: 91°FHi: 33°C | Lo: 59°FLo: 15°C | Hi: 89°FHi: 32°C | Lo: 55°FLo: 13°C | Hi: 89°FHi: 32°C | Lo: 59°FLo: 15°C |
| POP: 40% | POP: 30% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1247 PM MDT Fri Aug 21 2026 
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Dunn Forecast Discussion
Issued: 1203 PM MDT Fri Aug 21 2026
Key Messages
- Upper ridge will dominate the weather through early next week.
- Isolated severe thunderstorms may occur late this afternoon/evening in/near the Black Hills to SD/NE border
- Isolated severe thunderstorms may occur over northeastern WY late Saturday
- Temperatures will average about 4-8F above normal.
Discussion
...(This Afternoon Through Thursday) Issued at 1149 AM MDT Fri Aug 21 2026
Current upper-air analysis and water vapor imagery depict large- scale ridging continuing to strengthen over...