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Mayo School Weather Forecast
| THIS AFTERNOON | TONIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT |
 |  |  | |  | | | | | | | |
| Chance of T-Storm | Chance of T-Storm | Partly Cloudy | Chance of T-Storm | Mostly Sunny | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Mostly Sunny | Chance of T-Storm |
| Hi: 89°FHi: 32°C | Lo: 61°FLo: 16°C | Hi: 81°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 91°FHi: 33°C | Lo: 65°FLo: 18°C | Hi: 89°FHi: 32°C | Lo: 61°FLo: 16°C | Hi: 81°FHi: 27°C | Lo: 59°FLo: 15°C | Hi: 85°FHi: 29°C | Lo: 61°FLo: 16°C |
| POP: 20% | POP: 20% | POP: 50% | POP: 20% | POP: 30% | POP: 40% | POP: 30% | POP: 20% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1247 PM MDT Fri Aug 21 2026 
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Mayo School 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...