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

Hazardous Weather Conditions

Current conditions at

Sioux County Regional Airport (KSXK)

Lat: 42.99°NLon: 96.16°WElev: 1409ft.

Fair

88°F

31°C

Humidity 70%
Wind Speed S 14 mph
Barometer 29.89 in
Dewpoint 77°F (25°C)
Visibility 10.00 mi
Heat Index100°F (38°C)
Last update 16 Aug 3:55 pm CDT
Extended Forecast for

Alton IA

Heat Advisory until August 16, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory until August 16, 08:00pm

    NOW until 8:00pm Sat

    Heat Advisory

  • This Afternoon

    High: 91 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 72. Southeast wind 5 to 10 mph.

    Low: 72 °F

    Partly Cloudy

  • Sunday

    Sunday: A 10 percent chance of showers and thunderstorms after 5pm. Mostly sunny, with a high near 91. Heat index values as high as 102. Southeast wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 91 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 68. South southeast wind 5 to 10 mph.

    Low: 68 °F

    Chance
    T-storms

  • Monday

    Monday: A slight chance of thunderstorms before 7am. Mostly sunny, with a high near 89. South southwest wind around 5 mph becoming north in the afternoon. Chance of precipitation is 10%.

    High: 89 °F

    Slight Chance
    T-storms then
    Sunny

  • Monday Night

    Monday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 65. East northeast wind around 5 mph. Chance of precipitation is 30%.

    Low: 65 °F

    Chance
    T-storms

  • Tuesday

    Tuesday: Mostly sunny, with a high near 83.

    High: 83 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 61.

    Low: 61 °F

    Mostly Clear

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 91. Heat index values as high as 103. South wind around 10 mph.
Tonight
Partly cloudy, with a low around 72. Southeast wind 5 to 10 mph.
Sunday
A 10 percent chance of showers and thunderstorms after 5pm. Mostly sunny, with a high near 91. Heat index values as high as 102. Southeast wind 10 to 15 mph, with gusts as high as 20 mph.
Sunday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 68. South southeast wind 5 to 10 mph.
Monday
A slight chance of thunderstorms before 7am. Mostly sunny, with a high near 89. South southwest wind around 5 mph becoming north in the afternoon. Chance of precipitation is 10%.
Monday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 65. East northeast wind around 5 mph. Chance of precipitation is 30%.
Tuesday
Mostly sunny, with a high near 83.
Tuesday Night
Mostly clear, with a low around 61.
Wednesday
Sunny, with a high near 82.
Wednesday Night
Clear, with a low around 59.
Thursday
Sunny, with a high near 85.
Thursday Night
Mostly clear, with a low around 61.
Friday
Mostly sunny, with a high near 85.
Friday Night
A 30 percent chance of showers. Partly cloudy, with a low around 57.
Saturday
Mostly sunny, with a high near 79.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Alton IA
 42.98°N 96.01°W (Elev. 1283 ft)
Last Update:
3:56 pm CDT Aug 16, 2025
Forecast Valid:
4pm CDT Aug 16, 2025-6pm CDT Aug 23, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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