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Union County, IA Weather Forecast
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Union County Weather Forecast
| REST OF TONIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY |
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| Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of Showers | Showers | Chance of Showers | Mostly Cloudy | Partly Cloudy | Mostly Sunny | Partly Cloudy | Chance of Showers |
| Lo: 70°FLo: 21°C | Hi: 81°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 65°FHi: 18°C | Lo: 59°FLo: 15°C | Hi: 59°FHi: 15°C | Lo: 51°FLo: 11°C | Hi: 59°FHi: 15°C | Lo: 49°FLo: 9°C | Hi: 61°FHi: 16°C | Lo: 51°FLo: 11°C | Hi: 65°FHi: 18°C |
| POP: 40% | POP: 40% | POP: 50% | POP: 60% | POP: 50% | POP: 60% | POP: 20% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 929 PM CDT Fri Sep 18 2026 
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Issued: 654 PM CDT Fri Sep 18 2026
Key Messages
- Thunderstorm and heavy rain potential tonight into Saturday morning. A few strong storms are possible across western into northern Iowa, with wind and hail the primary risks.
- Additional showers and storms possible Saturday afternoon and evening. Greatest severe risk over southern Iowa with wind and hail main risks.
- Active weather continues Sunday into early next week. Potential for reprieve through mid-week.
Aviation
/00Z TAFS THROUGH 00Z SUNDAY/... Issued at 643 PM CDT Fri Sep 18 2026
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