National Weather Service Forecast for: Johnston IA
Issued by: National Weather Service Des Moines, IA
Updated: 2:06 pm CST Nov 1, 2026
 
This
Afternoon
This Afternoon: Mostly cloudy, with a high near 65. Southeast wind around 8 mph.
Mostly Cloudy

 Tonight

Tonight: A 40 percent chance of showers, mainly after 2am. Cloudy, with a low around 57. Southeast wind 7 to 13 mph, with gusts as high as 18 mph. New precipitation amounts of less than a tenth of an inch possible.
Mostly Cloudy
then Chance
Showers
 Monday

Monday: Showers likely, then showers and possibly a thunderstorm after 9am. High near 68. Breezy, with a south southeast wind 13 to 17 mph, with gusts as high as 31 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Showers and
Breezy
 Monday
Night
Monday Night: Showers and thunderstorms. Low around 60. South southeast wind 9 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
Showers

 Tuesday

Tuesday: Showers and possibly a thunderstorm before noon, then showers likely. High near 67. South southeast wind 8 to 10 mph becoming southwest in the afternoon. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Showers then
Showers
Likely
 Tuesday
Night
Tuesday Night: A 30 percent chance of showers before midnight. Mostly cloudy, with a low around 47. New precipitation amounts of less than a tenth of an inch possible.
Chance
Showers then
Mostly Cloudy
 Wednesday

Wednesday: A 30 percent chance of showers before noon. Mostly cloudy, with a high near 57.
Chance
Showers then
Mostly Cloudy
 Wednesday
Night
Wednesday Night: Mostly cloudy, with a low around 44.
Mostly Cloudy

 Thursday

Thursday: Mostly cloudy, with a high near 58.
Mostly Cloudy
Hi 65 °F Lo 57 °F Hi 68 °F Lo 60 °F Hi 67 °F Lo 47 °F Hi 57 °F Lo 44 °F Hi 58 °F

 

This Afternoon
 
 Mostly cloudy, with a high near 65. Southeast wind around 8 mph.
Tonight
 
 A 40 percent chance of showers, mainly after 2am. Cloudy, with a low around 57. Southeast wind 7 to 13 mph, with gusts as high as 18 mph. New precipitation amounts of less than a tenth of an inch possible.
Monday
 
 Showers likely, then showers and possibly a thunderstorm after 9am. High near 68. Breezy, with a south southeast wind 13 to 17 mph, with gusts as high as 31 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Monday Night
 
 Showers and thunderstorms. Low around 60. South southeast wind 9 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
Tuesday
 
 Showers and possibly a thunderstorm before noon, then showers likely. High near 67. South southeast wind 8 to 10 mph becoming southwest in the afternoon. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tuesday Night
 
 A 30 percent chance of showers before midnight. Mostly cloudy, with a low around 47. New precipitation amounts of less than a tenth of an inch possible.
Wednesday
 
 A 30 percent chance of showers before noon. Mostly cloudy, with a high near 57.
Wednesday Night
 
 Mostly cloudy, with a low around 44.
Thursday
 
 Mostly cloudy, with a high near 58.
Thursday Night
 
 Mostly cloudy, with a low around 43.
Friday
 
 Partly sunny, with a high near 57.
Friday Night
 
 Mostly cloudy, with a low around 41.
Saturday
 
 Mostly sunny, with a high near 61.

 

Forecast from NOAA-NWS for Johnston IA.