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Johnson County Weather Forecast
Johnson County, IA Weather Forecast Date: 1146 AM CDT Fri Sep 18 2026
Weather forecast for Johnson County, IA
Today Hi: 75°FHi: 24°C Lo: 69°F Lo: 21°C |
Rest of Today... Partly sunny with a chance of showers with a slight chance of thunderstorms. Highs in the mid 70s. East winds 10 to 15 mph. Chance of rain 50%. |
| Sat Hi: 81°FHi: 27°C Lo: 65°F Lo: 18°C |
Saturday... Mostly cloudy with a chance of thunderstorms. Showers likely, mainly in the morning. Humid with highs in the lower 80s. South winds 5 to 10 mph, becoming west in the afternoon. Chance of rain 70%. |
| Sun Hi: 65°FHi: 18°C Lo: 55°F Lo: 13°C |
Sunday... Showers in the morning, then showers likely with a chance of thunderstorms in the afternoon. Not as warm and humid. Near steady temperature in the mid 60s. Northeast winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 90%. |
Mon Hi: 61°FHi: 16°C Lo: 51°F Lo: 11°C |
Monday... Showers likely, mainly in the morning. Highs in the lower 60s. Chance of rain 70%. |
Tue Hi: 61°FHi: 16°C Lo: 50°F Lo: 10°C |
Tuesday... Mostly cloudy. Highs in the lower 60s. |
Wed Hi: 69°FHi: 21°C Lo: 50°F Lo: 10°C |
Wednesday... Partly cloudy. Lows around 50. Highs in the upper 60s. |
| Thu Hi: 69°FHi: 21°C Lo: 50°F Lo: 10°C |
Thursday... Partly cloudy. Lows around 50. Highs in the upper 60s. |
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