Local Forecast

Johnston, IA Weather Forecast & Alerts

Current conditions, 5-day forecast, and active NWS weather alerts for Johnston, IA.

No Active Alerts

Hour-by-Hour  Current Observation

Monday 7:45 AM CDTMonday 7:45 AM

°F °C
Regional Observations →
71°F

Cloudy

  • 84° / 68° High / Low
  • 71° Feels Like
  • 0% Chance of Rain

Wind

3 mph

SSE

UV Index

4

Moderate

Humidity

94%

Dew 69°F

Sun

5:40 AM · 8:46 PM

Rise · Set

Source: AMES (KAMW). Slider scrubs the next 12 hours.

5-Day Outlook

Through Friday

Local Radar →

Today

84° 68°

Chance of Thunderstorms

Overnight: Partly Cloudy

Detailed forecast

Today

A chance of showers and thunderstorms before noon. Partly sunny, with a high near 84. Northeast wind around 5 mph. Chance of precipitation is 30%. New rainfall amounts between a quarter and half of an inch possible.

Night

Partly cloudy. Low around 68, with temperatures rising to around 70 overnight. South wind around 3 mph.

Tuesday

91° 73°

Mostly Cloudy

Overnight: Chance of Scattered Thunderstorms

Detailed forecast

Tuesday

Mostly sunny, with a high near 91. Heat index values as high as 103. South southeast wind 2 to 13 mph, with gusts as high as 20 mph.

Night

A chance of showers and thunderstorms between 7pm and 1am. Partly cloudy. Low around 73, with temperatures rising to around 76 overnight. Heat index values as high as 105. South wind around 14 mph, with gusts as high as 24 mph. Chance of precipitation is 30%.

Wednesday

91° 66°

Thunderstorms Likely

Overnight: Scattered Thunderstorms Likely

Detailed forecast

Wednesday

Showers and thunderstorms likely after 1pm. Mostly sunny, with a high near 91. South southwest wind 15 to 20 mph, with gusts as high as 32 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch possible.

Night

Showers and thunderstorms likely before 1am, then a chance of showers and thunderstorms. Partly cloudy, with a low around 65. Chance of precipitation is 70%. New rainfall amounts between three quarters and one inch possible.

Thursday

82° 60°

Chance of Scattered Thunderstorms

Overnight: Slight Chance of Showers

Detailed forecast

Thursday

A chance of showers and thunderstorms before 1pm, then a chance of showers and thunderstorms. Sunny, with a high near 85. Chance of precipitation is 50%.

Night

A chance of showers and thunderstorms. Mostly clear, with a low around 60. Chance of precipitation is 40%.

Friday

86° 64°

Isolated T-storm

Overnight: Chance of Scattered Thunderstorms

Detailed forecast

Friday

A slight chance of rain showers. Sunny, with a high near 85.

Night

A slight chance of rain showers before 7pm, then a chance of showers and thunderstorms. Mostly clear, with a low around 63. Chance of precipitation is 30%.

Johnston, IA Weather Analysis Tools