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Jefferson County, IA Weather Forecast
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Jefferson County Weather Forecast
| TODAY | TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT |
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| Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of Showers | Chance of Showers | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Showers | Mostly Cloudy | Mostly Cloudy | Partly Cloudy |
| Hi: 80°FHi: 27°C | Lo: 65°FLo: 18°C | Hi: 81°FHi: 27°C | Lo: 69°FLo: 21°C | Hi: 85°FHi: 29°C | Hi: 70°FHi: 21°C Lo: 65°FLo: 18°C | Hi: 70°FHi: 21°C Lo: 65°FLo: 18°C | Lo: 59°FLo: 15°C | Hi: 65°FHi: 18°C | Hi: 65°FHi: 18°C Lo: 55°FLo: 13°C | Hi: 65°FHi: 18°C Lo: 55°FLo: 13°C | Hi: 71°FHi: 22°C Lo: 55°FLo: 13°C |
| POP: 40% | POP: 20% | POP: 50% | POP: 40% | POP: 40% | POP: 60% | POP: 60% | POP: 70% | POP: 70% |
POP = Probability of Precipitation.
Weather Outlook Updated: 456 AM CDT Thu Sep 17 2026 
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Issued: 642 AM CDT Thu Sep 17 2026
Key Messages
- A Flood Watch remains in effect for areas south of Highway 20 through 10 AM this morning. Rainfall rates of 1-2 inches per hour at times will produce 1-3 inches of rain with localized areas of 3-5 inches possible (30-50%) north of I-80.
- A Dense Fog Advisory is in effect for the I-380 corridor and southeastern Iowa through 9 AM this morning. Visibility could drop to a quarter of a mile in some spots.
- The wet weather pattern will continue through the weekend with rounds of rain which m...