50131 Weather (Johnston, IA)

Weather forecast for: Johnston IA

Last Update: 6:06 am CDT Sep 13, 2026

Today: Showers likely, mainly before 11am. Mostly cloudy, with a high near 68. Light and variable wind becoming east northeast 5 to 7 mph in the morning. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

Tonight: A 20 percent chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 58. East wind 3 to 8 mph.

Monday: Showers and thunderstorms likely, mainly before 4pm. Cloudy, then gradually becoming mostly sunny, with a high near 82. Breezy, with a southeast wind 13 to 18 mph, with gusts as high as 29 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Monday Night: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 11pm. Low around 66. South southeast wind 6 to 15 mph becoming west after midnight. Winds could gust as high as 26 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.

Tuesday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 73. Light and variable wind becoming north around 6 mph in the morning. Chance of precipitation is 70%. New precipitation amounts between a half and three quarters of an inch possible.

Tuesday Night: A chance of showers, with thunderstorms also possible after 1am. Mostly cloudy, with a low around 58. Chance of precipitation is 50%. New rainfall amounts between a half and three quarters of an inch possible.

Wednesday: Showers and possibly a thunderstorm. High near 68. Chance of precipitation is 90%.

Wednesday Night: Showers and possibly a thunderstorm. Low around 63. Chance of precipitation is 80%.

Thursday: Showers likely, mainly before 1pm. Mostly cloudy, with a high near 76. Chance of precipitation is 70%.

Thursday Night: A chance of showers and thunderstorms, then showers likely after 1am. Mostly cloudy, with a low around 62. Chance of precipitation is 60%.

Friday: A 50 percent chance of showers. Partly sunny, with a high near 74.

Friday Night: A 50 percent chance of showers. Mostly cloudy, with a low around 59.

Saturday: A 30 percent chance of showers. Partly sunny, with a high near 73.