National Weather Service United States Department of Commerce

Heavy rain and flash flooding possible in the Desert Southwest and Great Lake States this evening and tonight

A slow moving cold front may bring heavy rain and localized flooding Wednesday to portions of the Great Plains. More heavy rain will be possible in the Desert Southwest again Wednesday. Hot temperatures will continue in the Mississippi Valley - and spread up the east coast Wednesday.
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Hazardous Weather Conditions

Current Conditions

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Johnston IA

7 Day Forecast

For More Weather Information:

Des Moines, IA Local Forecast Office

Today

Scattered Thunderstorms Chance for Measurable Precipitation 30%

Scattered
Thunderstorms

High: 79 °F

Tonight

Thunderstorms Likely Chance for Measurable Precipitation 60%

Thunderstorms
Likely

Low: 65 °F

Thursday

Thunderstorms Likely Chance for Measurable Precipitation 70%

Thunderstorms
Likely

High: 82 °F

Thursday
Night

Thunderstorms Likely Chance for Measurable Precipitation 60%

Thunderstorms
Likely

Low: 67 °F

Friday

Chance Thunderstorms Chance for Measurable Precipitation 40%

Chance
Thunderstorms

High: 81 °F

Friday
Night

Chance Thunderstorms Chance for Measurable Precipitation 40%

Chance
Thunderstorms

Low: 65 °F

Saturday

Chance Thunderstorms Chance for Measurable Precipitation 40%

Chance
Thunderstorms

High: 80 °F

Saturday
Night

Partly Cloudy

Partly
Cloudy

Low: 63 °F

Sunday

Mostly Sunny

Mostly
Sunny

High: 82 °F

Detailed Forecast

  • Today Scattered showers and thunderstorms, mainly before 10am. Mostly cloudy, with a high near 79. East southeast wind 3 to 6 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
  • Tonight Showers and thunderstorms likely, mainly after 3am. Mostly cloudy, with a low around 65. East southeast wind around 6 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
  • Thursday Showers and thunderstorms likely, mainly before 1pm. Mostly cloudy, with a high near 82. South wind around 9 mph. Chance of precipitation is 70%. New rainfall amounts between a half and three quarters of an inch possible.
  • Thursday Night Showers and thunderstorms likely, mainly before 1am. Mostly cloudy, with a low around 67. South wind 3 to 6 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
  • Friday A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 81. Southwest wind 5 to 7 mph. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
  • Friday Night A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 65. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
  • Saturday A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 80.
  • Saturday Night Partly cloudy, with a low around 63.
  • Sunday Mostly sunny, with a high near 82.
  • Sunday Night A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 67.
  • Labor Day A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 84.
  • Monday Night A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 64.
  • Tuesday A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 80.