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

Hazardous Weather Conditions

Current conditions at

Mason City Municipal Airport (KMCW)

Lat: 43.15°NLon: 93.33°WElev: 1188ft.

Fair

-3°F

-19°C

Humidity 86%
Wind Speed S 3 mph
Barometer 30.25 in (1027.2 mb)
Dewpoint -6°F (-21°C)
Visibility 10.00 mi
Last update 20 Jan 8:53 am CST
Extended Forecast for

Thornton IA

Winter Weather Advisory January 20, 03:00pm until January 21, 03:00am
Click here for hazard details and duration
Winter Weather Advisory

  • Today

    Today: Snow, mainly after 5pm. High near 17. Wind chill values as low as -10. South southwest wind 3 to 8 mph. Chance of precipitation is 80%. Total daytime snow accumulation of less than a half inch possible.

    High: 17 °F

    Mostly Sunny
    then Snow

  • Tonight

    Tonight: Snow before 3am, then a chance of flurries between 3am and 4am. Low around 11. Wind chill values as low as zero. South southeast wind 5 to 9 mph becoming north northwest after midnight. Chance of precipitation is 100%. New snow accumulation of 1 to 3 inches possible.

    Low: 11 °F

    Snow then
    Chance Snow

  • Wednesday

    Wednesday: A 50 percent chance of snow showers after noon. Patchy blowing snow after 2pm. Increasing clouds, with a high near 27. Wind chill values as low as zero. Windy, with a west southwest wind 9 to 14 mph increasing to 19 to 24 mph in the afternoon. Winds could gust as high as 30 mph. New snow accumulation of less than one inch possible.

    High: 27 °F

    Chance Snow
    Showers and
    Patchy
    Blowing Snow

  • Wednesday Night

    Wednesday Night: Patchy blowing snow before 9pm. Partly cloudy, with a low around 3. Wind chill values as low as -10. Windy, with a west northwest wind 18 to 23 mph decreasing to 9 to 14 mph after midnight. Winds could gust as high as 31 mph.

    Low: 3 °F

    Patchy
    Blowing Snow
    and Windy
    then Partly
    Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 14. West wind 9 to 14 mph, with gusts as high as 18 mph.

    High: 14 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around -18.

    Low: -18 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny and cold, with a high near -10.

    High: -10 °F

    Cold

  • Friday Night

    Friday Night: Partly cloudy, with a low around -18.

    Low: -18 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny and cold, with a high near -3.

    High: -3 °F

    Cold

Detailed Forecast

Today
Snow, mainly after 5pm. High near 17. Wind chill values as low as -10. South southwest wind 3 to 8 mph. Chance of precipitation is 80%. Total daytime snow accumulation of less than a half inch possible.
Tonight
Snow before 3am, then a chance of flurries between 3am and 4am. Low around 11. Wind chill values as low as zero. South southeast wind 5 to 9 mph becoming north northwest after midnight. Chance of precipitation is 100%. New snow accumulation of 1 to 3 inches possible.
Wednesday
A 50 percent chance of snow showers after noon. Patchy blowing snow after 2pm. Increasing clouds, with a high near 27. Wind chill values as low as zero. Windy, with a west southwest wind 9 to 14 mph increasing to 19 to 24 mph in the afternoon. Winds could gust as high as 30 mph. New snow accumulation of less than one inch possible.
Wednesday Night
Patchy blowing snow before 9pm. Partly cloudy, with a low around 3. Wind chill values as low as -10. Windy, with a west northwest wind 18 to 23 mph decreasing to 9 to 14 mph after midnight. Winds could gust as high as 31 mph.
Thursday
Partly sunny, with a high near 14. West wind 9 to 14 mph, with gusts as high as 18 mph.
Thursday Night
Partly cloudy, with a low around -18.
Friday
Mostly sunny and cold, with a high near -10.
Friday Night
Partly cloudy, with a low around -18.
Saturday
Partly sunny and cold, with a high near -3.
Saturday Night
Partly cloudy, with a low around -12.
Sunday
Mostly sunny and cold, with a high near 9.
Sunday Night
Partly cloudy, with a low around -6.
Monday
Sunny, with a high near 16.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Thornton IA
 42.95°N 93.37°W
Last Update:
6:43 am CST Jan 20, 2026
Forecast Valid:
9am CST Jan 20, 2026-6pm CST Jan 26, 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