Weather World
City of Johnston, IAJohnston, IA 7-Day Weather Forecast
Quick Weather Clicks
Settings
Sun & Moon
Johnston Weather Forecast
Johnston, IA Weather Forecast Date: 603 PM CDT Thu Sep 24 2026
Weather forecast for Johnston, IA
Tonight Lo: 61°F Lo: 16°C |
Tonight... Cloudy. A chance of showers this evening, then showers likely after midnight. Lows in the lower 60s. East winds around 5 mph. Chance of rain 70%. |
| Fri Hi: 61°FHi: 16°C Lo: 60°F Lo: 16°C |
Friday... Showers. Near steady temperature in the lower 60s. Southeast winds 5 to 10 mph. Chance of rain 90%. |
| Sat Hi: 61°FHi: 16°C Lo: 60°F Lo: 16°C |
Saturday... Showers. Near steady temperature in the lower 60s. Southeast winds around 10 mph with gusts up to 20 mph. Chance of rain near 100%. |
Sun Hi: 69°FHi: 21°C Lo: 59°F Lo: 15°C |
Sunday... Mostly cloudy. A slight chance of showers in the morning. Highs in the upper 60s. Chance of rain 20%. |
Mon Hi: 70°FHi: 21°C Lo: 61°F Lo: 16°C |
Monday... Partly sunny. Highs around 70. |
Tue Hi: 69°FHi: 21°C Lo: 61°F Lo: 16°C |
Tuesday... Showers likely in the morning, then showers with a slight chance of thunderstorms in the afternoon. Highs in the upper 60s. Chance of rain 80%. |
| Wed Hi: 61°FHi: 16°C Lo: 60°F Lo: 16°C |
Wednesday... Mostly cloudy in the morning, then becoming partly sunny. A slight chance of thunderstorms. A chance of showers. Near steady temperature in the lower 60s. Chance of rain 50%. |
Johnston Radar Loop
Use the map search tool if you want to place a location marker on the radar map...