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Flat Lake, IA Weather Forecast
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Flat Lake Weather Forecast
| TODAY | TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT |
 |  |  |  | |  |  | | | | | |
| Chance of Showers | Mostly Clear | Chance of Showers | Chance of T-Storm | Showers | Chance of Showers | Chance of T-Storm | Chance of T-Storm | Showers | Chance of Showers | Showers Likely | Chance of Showers |
| Hi: 69°FHi: 21°C | Lo: 50°FLo: 10°C | Hi: 75°FHi: 24°C | Lo: 69°FLo: 21°C | Hi: 79°FHi: 26°C | Lo: 59°FLo: 15°C | Hi: 71°FHi: 22°C | Lo: 61°FLo: 16°C | Hi: 79°FHi: 26°C | Lo: 61°FLo: 16°C | Hi: 75°FHi: 24°C | Lo: 59°FLo: 15°C |
| POP: 40% | POP: 40% | POP: 100% | POP: 100% | POP: 50% | POP: 80% | POP: 80% | POP: 70% | POP: 50% | POP: 60% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 531 AM CDT Sun Sep 13 2026 
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Issued: 552 AM CDT Sun Sep 13 2026
Key Messages
- Active pattern this week to bring numerous rounds of showers and storms with heavy rain possible.
- There is a Marginal Risk, Level 1 out of 5, for severe storms north of I-80 Monday evening into the overnight hours. Primary hazards will be heavy rain and damaging winds.
- An elevated flash flood risk may develop mid-week with repeating rounds of storms. Rainfall totals over 2 inches are likely (60-80%), with localized areas of 5+ inches possible (10-20%), leading to rises on area creeks...