National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Sioux City, Sioux Gateway Airport (KSUX)

Lat: 42.4°NLon: 96.38°WElev: 1099ft.

Fair and Breezy

85°F

29°C

Humidity 59%
Wind Speed S 21 G 41 mph
Barometer 29.53 in (998.8 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Heat Index89°F (32°C)
Last update 21 Jun 1:52 am CDT
Extended Forecast for

Sioux City IA

Extreme Heat Warning June 21, 03:23am until June 22, 09:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning June 21, 03:23am until June 22, 09:00pm

    NOW until 9:00pm Sun

    Extreme Heat Warning

  • Overnight

    Low: 78 °F

    Mostly Clear
    and Breezy

  • Saturday

    Saturday: Sunny and hot, with a high near 103. Heat index values as high as 110. Breezy, with a south southwest wind around 20 mph, with gusts as high as 35 mph.

    High: 103 °F

    Hot and
    Breezy

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 79. Breezy, with a south wind 15 to 20 mph, with gusts as high as 30 mph.

    Low: 79 °F

    Mostly Clear
    and Breezy
    then Mostly
    Clear

  • Sunday

    Sunday: Sunny and hot, with a high near 102. Heat index values as high as 108. Breezy, with a south wind 15 to 20 mph, with gusts as high as 35 mph.

    High: 102 °F

    Hot and
    Breezy

  • Sunday Night

    Sunday Night: A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69. South wind 10 to 15 mph, with gusts as high as 30 mph.

    Low: 69 °F

    Chance
    T-storms

  • Monday

    Monday: A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 82. North wind around 10 mph, with gusts as high as 20 mph.

    High: 82 °F

    Chance
    T-storms

  • Monday Night

    Monday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 63. Chance of precipitation is 70%.

    Low: 63 °F

    Chance
    T-storms then
    Showers
    Likely

  • Tuesday

    Tuesday: Showers and possibly a thunderstorm. High near 81. Chance of precipitation is 80%.

    High: 81 °F

    Showers

Detailed Forecast

Overnight
Mostly clear, with a low around 78. Breezy, with a south wind around 20 mph, with gusts as high as 30 mph.
Saturday
Sunny and hot, with a high near 103. Heat index values as high as 110. Breezy, with a south southwest wind around 20 mph, with gusts as high as 35 mph.
Saturday Night
Mostly clear, with a low around 79. Breezy, with a south wind 15 to 20 mph, with gusts as high as 30 mph.
Sunday
Sunny and hot, with a high near 102. Heat index values as high as 108. Breezy, with a south wind 15 to 20 mph, with gusts as high as 35 mph.
Sunday Night
A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69. South wind 10 to 15 mph, with gusts as high as 30 mph.
Monday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 82. North wind around 10 mph, with gusts as high as 20 mph.
Monday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 63. Chance of precipitation is 70%.
Tuesday
Showers and possibly a thunderstorm. High near 81. Chance of precipitation is 80%.
Tuesday Night
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 1am. Low around 66. Chance of precipitation is 80%.
Wednesday
Showers and possibly a thunderstorm. High near 84. Chance of precipitation is 80%.
Wednesday Night
Showers and possibly a thunderstorm. Low around 65. Chance of precipitation is 80%.
Thursday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 82.
Thursday Night
Partly cloudy, with a low around 62.
Friday
Mostly sunny, with a high near 86.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Sioux City IA
 42.5°N 96.39°W (Elev. 1099 ft)
Last Update:
2:45 am CDT Jun 21, 2025
Forecast Valid:
3am CDT Jun 21, 2025-6pm CDT Jun 27, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation