| National Weather Service Forecast for:
Johnston IA Issued by: National Weather Service Des Moines, IA |
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| Updated: 2:36 am CDT Apr 6, 2026 | ||||||||||||||||||
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| Today |
A 40 percent chance of showers, mainly after 3pm. Increasing clouds, with a high near 46. North wind 7 to 10 mph. |
| Tonight |
A chance of rain showers before 10pm, then a slight chance of snow showers after 5am. Cloudy, with a low around 28. North wind around 7 mph becoming east northeast after midnight. Chance of precipitation is 30%. New snow accumulation of less than a half inch possible. |
| Tuesday |
A chance of snow showers before 1pm, then rain likely, possibly mixed with snow showers. Cloudy, with a high near 40. East southeast wind 7 to 14 mph, with gusts as high as 21 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible. |
| Tuesday Night |
Rain likely, possibly mixed with snow showers before 7pm, then a chance of rain showers. Mostly cloudy, with a low around 36. Southeast wind around 14 mph, with gusts as high as 24 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible. |
| Wednesday |
A chance of showers, with thunderstorms also possible after 4pm. Partly sunny, with a high near 67. Windy, with a south southwest wind 16 to 22 mph, with gusts as high as 33 mph. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms. |
| Wednesday Night |
Showers likely and possibly a thunderstorm before 1am, then a chance of showers. Mostly cloudy, with a low around 46. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms. |
| Thursday |
Showers likely, mainly after 1pm. Mostly cloudy, with a high near 61. Chance of precipitation is 60%. |
| Thursday Night |
A 50 percent chance of showers. Mostly cloudy, with a low around 43. |
| Friday |
A 30 percent chance of showers after 1pm. Partly sunny, with a high near 61. |
| Friday Night |
A 50 percent chance of showers. Mostly cloudy, with a low around 46. |
| Saturday |
Showers likely. Mostly cloudy, with a high near 65. Chance of precipitation is 60%. |
| Saturday Night |
Showers likely. Cloudy, with a low around 56. Chance of precipitation is 60%. |
| Sunday |
Showers likely. Mostly cloudy, with a high near 75. Breezy. Chance of precipitation is 70%. |
Forecast from NOAA-NWS for Johnston IA.