National Weather Service Forecast for: Johnston IA
Issued by: National Weather Service Des Moines, IA
Updated: 6:18 pm CDT Apr 20, 2025
 
Tonight

Tonight: Showers, mainly before 1am. Low around 43. Breezy, with a north northeast wind 13 to 16 mph becoming west northwest after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Showers then
Chance
Showers and
Breezy
 Monday

Monday: Cloudy through mid morning, then gradual clearing, with a high near 67. West northwest wind 9 to 15 mph, with gusts as high as 24 mph.
Becoming
Sunny

 Monday
Night
Monday Night: A chance of showers between 1am and 4am, then a chance of showers and thunderstorms after 4am. Increasing clouds, with a low around 48. South southeast wind 5 to 7 mph. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Clear then
Chance
Showers
 Tuesday

Tuesday: A chance of showers and thunderstorms before 10am, then a chance of showers between 10am and 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 74. Southeast wind 9 to 13 mph becoming southwest in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Chance
Showers

 Tuesday
Night
Tuesday Night: A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Partly cloudy, with a low around 50. South southwest wind around 6 mph becoming calm after midnight. Chance of precipitation is 20%.
Slight Chance
T-storms then
Slight Chance
Showers
 Wednesday

Wednesday: A 40 percent chance of showers, mainly after 1pm. Mostly sunny, with a high near 75. New precipitation amounts of less than a tenth of an inch possible.
Chance
Showers

 Wednesday
Night
Wednesday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 55. Chance of precipitation is 60%.
Showers
Likely

 Thursday

Thursday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 74. Chance of precipitation is 70%.
Showers
Likely

 Thursday
Night
Thursday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers. Mostly cloudy, with a low around 53. Chance of precipitation is 60%.
Showers
Likely
Lo 43 °F Hi 67 °F Lo 48 °F Hi 74 °F Lo 50 °F Hi 75 °F Lo 55 °F Hi 74 °F Lo 53 °F

Hazardous Weather Outlook
 

Tonight
 
 Showers, mainly before 1am. Low around 43. Breezy, with a north northeast wind 13 to 16 mph becoming west northwest after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Monday
 
 Cloudy through mid morning, then gradual clearing, with a high near 67. West northwest wind 9 to 15 mph, with gusts as high as 24 mph.
Monday Night
 
 A chance of showers between 1am and 4am, then a chance of showers and thunderstorms after 4am. Increasing clouds, with a low around 48. South southeast wind 5 to 7 mph. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tuesday
 
 A chance of showers and thunderstorms before 10am, then a chance of showers between 10am and 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 74. Southeast wind 9 to 13 mph becoming southwest in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tuesday Night
 
 A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Partly cloudy, with a low around 50. South southwest wind around 6 mph becoming calm after midnight. Chance of precipitation is 20%.
Wednesday
 
 A 40 percent chance of showers, mainly after 1pm. Mostly sunny, with a high near 75. New precipitation amounts of less than a tenth of an inch possible.
Wednesday Night
 
 Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 55. Chance of precipitation is 60%.
Thursday
 
 Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 74. Chance of precipitation is 70%.
Thursday Night
 
 Showers likely and possibly a thunderstorm before 1am, then a chance of showers. Mostly cloudy, with a low around 53. Chance of precipitation is 60%.
Friday
 
 A 40 percent chance of showers. Partly sunny, with a high near 66.
Friday Night
 
 Mostly cloudy, with a low around 46.
Saturday
 
 Partly sunny, with a high near 65.
Saturday Night
 
 Mostly cloudy, with a low around 47.
Sunday
 
 A 40 percent chance of showers. Partly sunny, with a high near 66.

 

Forecast from NOAA-NWS for Johnston IA.