Johnston, IA
Overnight: A 10 percent chance of showers and thunderstorms after 5am. Partly cloudy, with a low around 70. Calm wind becoming northeast around 5 mph.
Monday: A 20 percent chance of showers and thunderstorms before 9am. Mostly cloudy, then gradually becoming sunny, with a high near 88. East wind 5 to 8 mph.
Tuesday: A 30 percent chance of showers and thunderstorms, mainly before 7am. Mostly sunny, with a high near 90. Heat index values as high as 102. South southeast wind 5 to 7 mph becoming west in the afternoon. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tuesday Night: A 40 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 70. North northeast wind around 5 mph becoming light and variable after midnight. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday: A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 86.
Wednesday Night: A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 67.
Thursday: Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 75. Chance of precipitation is 70%.
Thursday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 64.
Friday: Showers likely, mainly before 1pm. Mostly cloudy, with a high near 74. Chance of precipitation is 60%.
Friday Night: Showers and thunderstorms likely. Mostly cloudy, with a low around 64. Chance of precipitation is 60%.
Saturday: A 40 percent chance of showers. Mostly cloudy, with a high near 77.
Saturday Night: A 40 percent chance of showers. Mostly cloudy, with a low around 64.
Sunday: A 30 percent chance of showers. Partly sunny, with a high near 75.
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