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Union Weather Forecast
| REST OF TODAY | TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY |
| Chance of T-Storm | Chance of T-Storm | Windy | Chance of Showers | Windy | Mostly Clear | Mostly Clear | Mostly Sunny | Chance of Showers | Chance of Showers | Chance of Showers | Partly Sunny |
| Hi: 75°FHi: 24°C | Lo: 58°FLo: 14°C | Hi: 73°FHi: 23°C | Lo: 53°FLo: 12°C | Hi: 65°FHi: 18°C | Hi: 75°FHi: 24°C Lo: 53°FLo: 12°C | Hi: 75°FHi: 24°C Lo: 53°FLo: 12°C | Hi: 68°FHi: 20°C | Lo: 45°FLo: 7°C | Hi: 58°FHi: 14°C Lo: 43°FLo: 6°C | Hi: 58°FHi: 14°C Lo: 43°FLo: 6°C | Hi: 58°FHi: 14°C |
| POP: 100% | POP: 50% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1037 AM CDT Mon Sep 07 2026 

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Issued: 633 AM CDT Mon Sep 7 2026
Key Messages
- There is a level 1 out of 5 risk for severe storms today. The main impacts for any storms that become severe will be ping pong ball sized hail and winds to 60 mph. Flash Flooding is also possible.
Discussion
... Issued at 229 PM CDT Sun Sep 6 2026
...Synopsis...
Several weak shortwaves under the main upper ridge currently bringing some thunderstorms to central ND and eastern SD. The main surface low and inverted trough is still over the western Dakotas, and should begin to move eastward ...
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