Weather Alert
Johnston Weather Warning NWS WEATHER ALERT FOR THE JOHNSTON, IA AREA - FLOOD WATCH Issued: 812 PM CDT Tue Sep 15 2026 Johnston Weather Warning

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Johnston, IA Weather - Hour by Hour Forecast

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Johnston, IA Weather - Hour by Hour Forecast

24 Hour Forecast

Current Conditions - Clear. Temperature is 62°F17°C, dew point 62°F17°C, humidity 100%. Wind direction is NNE at 3 mph5 km/h with visibility of 10 mi16 km. Barometric pressure is 30.17 in1022 mb.
Tonight - Mostly cloudy. A slight chance of showers this evening, then a chance of showers with a slight chance of thunderstorms after midni.. Full Forecast
Wednesday - Mostly cloudy with a chance of showers with a slight chance of thunderstorms. Some thunderstorms May produce heavy rainfall. Highs.. Full Forecast

Johnston Hourly Weather

24 Hour Forecast Scroll
Tue, Sep 15
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Johnston, IA Hourly Weather - Cloudy - 9:00 PM Johnston, IA Hourly Weather - Cloudy - 10:00 PM Johnston, IA Hourly Weather - Cloudy - 11:00 PM Johnston, IA Hourly Weather - Cloudy - 12:00 AM Johnston, IA Hourly Weather - Cloudy - 1:00 AM Johnston, IA Hourly Weather - Cloudy - 2:00 AM Johnston, IA Hourly Weather - Cloudy - 3:00 AM Johnston, IA Hourly Weather - Cloudy - 4:00 AM Johnston, IA Hourly Weather - Cloudy - 5:00 AM Johnston, IA Hourly Weather - Cloudy - 6:00 AM Johnston, IA Hourly Weather - Cloudy - 7:00 AM Johnston, IA Hourly Weather - Cloudy - 8:00 AM Johnston, IA Hourly Weather - Cloudy - 9:00 AM Johnston, IA Hourly Weather - Cloudy - 10:00 AM Johnston, IA Hourly Weather - Cloudy - 11:00 AM Johnston, IA Hourly Weather - Cloudy - 12:00 PM Johnston, IA Hourly Weather - Cloudy - 1:00 PM Johnston, IA Hourly Weather - Cloudy - 2:00 PM Johnston, IA Hourly Weather - Cloudy - 3:00 PM Johnston, IA Hourly Weather - Cloudy - 4:00 PM Johnston, IA Hourly Weather - Cloudy - 5:00 PM Johnston, IA Hourly Weather - Mostly Cloudy - 6:00 PM Johnston, IA Hourly Weather - Mostly Cloudy - 7:00 PM Johnston, IA Hourly Weather - Mostly Cloudy - 8:00 PM
Cloudy Cloudy Cloudy Cloudy Cloudy Cloudy Cloudy Cloudy Cloudy Cloudy Cloudy Cloudy Cloudy Cloudy Cloudy Cloudy Cloudy Cloudy Cloudy Cloudy Cloudy Mostly Cloudy Mostly Cloudy Mostly Cloudy
66°F19°C 66°F19°C 66°F19°C 66°F19°C 66°F19°C 66°F19°C 66°F19°C 66°F19°C 66°F19°C 65°F18°C 65°F18°C 67°F19°C 68°F20°C 70°F21°C 72°F22°C 73°F23°C 75°F24°C 76°F24°C 76°F24°C 77°F25°C 76°F24°C 74°F23°C 73°F23°C 72°F22°C
Rain Rain Rain Rain Rain Rain Rain Rain Rain Rain Rain Rain Rain Rain Rain Rain Rain Rain Rain Rain Rain Rain Rain Rain
37% 37% 37% 37% 37% 48% 48% 48% 48% 48% 48% 47% 47% 47% 47% 47% 47% 22% 22% 22% 22% 22% 22% 25%
66°F19°C 66°F19°C 66°F19°C 66°F19°C 66°F19°C 66°F19°C 66°F19°C 66°F19°C 66°F19°C 65°F18°C 65°F18°C 67°F19°C 68°F20°C 70°F21°C 70°F21°C 70°F21°C 70°F21°C 70°F21°C 71°F22°C 71°F22°C 71°F22°C 71°F22°C 71°F22°C 70°F21°C
100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% 93% 90% 84% 82% 85% 82% 85% 90% 93% 93%
E E E E ESE SE SE SE S SSW NW NW NNW N W S E E E ESE E E E E
4 mph 4 mph 4 mph 2 mph 2 mph 2 mph 1 mph 1 mph 1 mph 2 mph 2 mph 2 mph 2 mph 2 mph 2 mph 4 mph 4 mph 4 mph 4 mph 4 mph 4 mph 5 mph 5 mph 5 mph
5 mi8 km 5 mi8 km 3 mi5 km .5 mi1 km .25 mi0 km .25 mi0 km .25 mi0 km .25 mi0 km .5 mi1 km 3 mi5 km 5 mi8 km 5 mi8 km 5 mi8 km 5 mi8 km 6 mi10 km 6 mi10 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km
Hour (CDT)
Weather
Clouds
Temperature
Precip. Type
POP
Dewpoint
Humidity
Wind Direction
Wind Speed
Visibility
POP = Probability of Precipitation. ** Indicates missing data/values from KIKV model statistics.

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Prob Precip % = Probability of Precipitation.

Johnston 36 Hour Forecast

POP = Probability of Precipitation. ** Indicates missing data/values from model statistics.

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