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City of Johnston, IAJohnston, IA 7-Day Weather Forecast
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Johnston Weather Forecast
Johnston, IA Weather Forecast Date: 518 AM CDT Sat Sep 19 2026
Weather forecast for Johnston, IA
Today Hi: 81°FHi: 27°C Lo: 61°F Lo: 16°C |
Today... Mostly cloudy with a chance of showers and thunderstorms this morning, then partly sunny with a slight chance of showers and thunderstorms this afternoon. Highs in the lower 80s. Southwest winds 5 to 10 mph, becoming west this afternoon. Chance of rain 50%. |
| Sun Hi: 65°FHi: 18°C Lo: 59°F Lo: 15°C |
Sunday... Cloudy. A chance of drizzle and showers in the morning, then a slight chance of showers, thunderstorms and drizzle in the afternoon. Cooler. Near steady temperature in the mid 60s. Northeast winds 10 to 15 mph. Chance of rain 50%. |
Mon Hi: 61°FHi: 16°C Lo: 51°F Lo: 11°C |
Monday... Cloudy with a 50% chance of showers. Highs in the lower 60s. Northeast winds around 10 mph with gusts up to 20 mph. |
Tue Hi: 60°FHi: 16°C Lo: 49°F Lo: 9°C |
Tuesday... Partly sunny. Highs around 60. |
Wed Hi: 65°FHi: 18°C Lo: 51°F Lo: 11°C |
Wednesday... Sunny. Highs in the mid 60s. |
Thu Hi: 65°FHi: 18°C Lo: 55°F Lo: 13°C |
Thursday... Partly sunny. A slight chance of showers in the morning. Highs in the mid 60s. Chance of rain 20%. |
| Fri Hi: 69°FHi: 21°C |
Friday... Partly sunny. Highs in the upper 60s. |
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