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Roundup Lake, NE Weather Forecast
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Roundup Lake Weather Forecast
| REST OF TODAY | TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT |
 |  | |  |  | | | | | |  | |
| Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Mostly Clear | Sunny | Mostly Clear | Sunny | Mostly Clear | Mostly Sunny | Chance of T-Storm | Clearing | Chance of T-Storm |
| Hi: 85°FHi: 29°C | Lo: 59°FLo: 15°C | Hi: 81°FHi: 27°C | Lo: 59°FLo: 15°C | Hi: 89°FHi: 32°C | Lo: 61°FLo: 16°C | Hi: 91°FHi: 33°C | Lo: 61°FLo: 16°C | Hi: 89°FHi: 32°C | Lo: 61°FLo: 16°C | Hi: 90°FHi: 32°C | Lo: 61°FLo: 16°C |
| POP: 20% | POP: 50% | POP: 50% | POP: 30% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 711 AM MDT Tue Aug 18 2026 
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Roundup Lake Forecast Discussion
Issued: 154 PM CDT Tue Aug 18 2026
Key Messages
-Severe thunderstorms are possible this afternoon and evening, with the greatest threat across southwest Nebraska. Large to very large hail, damaging winds, and locally heavy rainfall are possible.
-Additional strong to severe thunderstorms are possible Wednesday and Thursday, though the exact coverage and location of the greatest threat remain uncertain.
-Warmer and drier conditions return Friday through the weekend, with highs climbing into the upper 80s...