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

Sioux County Regional Airport (KSXK)

Lat: 42.99°NLon: 96.16°WElev: 1409ft.

Fair

66°F

19°C

Humidity 78%
Wind Speed Calm
Barometer 30.09 in
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 9 Sep 11:15 pm CDT
Extended Forecast for

Alton IA

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming clear, with a low around 51. Calm wind.

    Low: 51 °F

    Decreasing
    Clouds

  • Thursday

    Thursday: Sunny, with a high near 80. Light south wind becoming south southwest 5 to 10 mph in the afternoon.

    High: 80 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 61. South southeast wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 61 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 82. Breezy, with a south wind 15 to 25 mph, with gusts as high as 30 mph.

    High: 82 °F

    Mostly Sunny
    and Breezy

  • Friday Night

    Friday Night: A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 58. Breezy, with a south wind 10 to 20 mph becoming north after midnight. Winds could gust as high as 25 mph.

    Low: 58 °F

    Slight Chance
    T-storms and
    Breezy

  • Saturday

    Saturday: Mostly sunny, with a high near 73. North wind 5 to 10 mph.

    High: 73 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 52.

    Low: 52 °F

    Mostly Clear

  • Sunday

    Sunday: Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 71. Chance of precipitation is 60%.

    High: 71 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: Showers and possibly a thunderstorm. Low around 59. Chance of precipitation is 80%.

    Low: 59 °F

    Showers

Detailed Forecast

Tonight
Mostly cloudy, then gradually becoming clear, with a low around 51. Calm wind.
Thursday
Sunny, with a high near 80. Light south wind becoming south southwest 5 to 10 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 61. South southeast wind 10 to 15 mph, with gusts as high as 20 mph.
Friday
Mostly sunny, with a high near 82. Breezy, with a south wind 15 to 25 mph, with gusts as high as 30 mph.
Friday Night
A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 58. Breezy, with a south wind 10 to 20 mph becoming north after midnight. Winds could gust as high as 25 mph.
Saturday
Mostly sunny, with a high near 73. North wind 5 to 10 mph.
Saturday Night
Mostly clear, with a low around 52.
Sunday
Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 71. Chance of precipitation is 60%.
Sunday Night
Showers and possibly a thunderstorm. Low around 59. Chance of precipitation is 80%.
Monday
Showers likely, mainly before 1pm. Mostly cloudy, with a high near 76. Chance of precipitation is 60%.
Monday Night
Partly cloudy, with a low around 52.
Tuesday
Mostly sunny, with a high near 69.
Tuesday Night
Partly cloudy, with a low around 52.
Wednesday
A 40 percent chance of showers. Mostly cloudy, with a high near 71.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Alton IA
 43°N 96.01°W (Elev. 1289 ft)
Last Update:
9:48 pm CDT Sep 9, 2026
Forecast Valid:
11pm CDT Sep 9, 2026-6pm CDT Sep 16, 2026
 
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