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Halley Park Weather Forecast
| THIS AFTERNOON | TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT |
 |  |  |  | | | | | | | |  |
| Chance of T-Storm | Partly Cloudy | Mostly Sunny | Mostly Clear | Sunny | Clear | Sunny | Mostly Clear | Mostly Sunny | Partly Cloudy | Chance of T-Storm | Chance of T-Storm |
| Hi: 79°FHi: 26°C | Lo: 59°FLo: 15°C | Hi: 91°FHi: 33°C | Lo: 65°FLo: 18°C | Hi: 91°FHi: 33°C | Lo: 65°FLo: 18°C | Hi: 95°FHi: 35°C | Lo: 65°FLo: 18°C | Hi: 91°FHi: 33°C | Lo: 65°FLo: 18°C | Hi: 85°FHi: 29°C | Lo: 61°FLo: 16°C |
| POP: 30% | POP: 30% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1047 AM MDT Tue Sep 01 2026 
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Issued: 1122 AM MDT Tue Sep 1 2026
Key Messages
- A few severe thunderstorms are possible this afternoon especially east of Oglala Lakota County and south of I-90; damaging winds and large hail could occur.
- Cooler today, then above average temperatures (10F+ above normal) for the latter half of the week.
- Near-critical to critical fire weather conditions expected Wednesday through at least Friday.
Discussion
...(This Evening Through Monday) Issued at 100 PM MDT Mon Aug 31 2026
Water vapor imagery shows upper low centered over eastern Sa...