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.

Overcast and Windy

-1°F

-18°C

Humidity 65%
Wind Speed NW 40 G 51 mph
Barometer 30.09 in (1021.4 mb)
Dewpoint -10°F (-23°C)
Visibility 7.00 mi
Wind Chill-30°F (-34°C)
Last update 18 Jan 10:53 pm CST
Extended Forecast for

Thornton IA

Cold Weather Advisory until January 19, 12:00pm
Winter Weather Advisory January 18, 11:10pm until January 19, 12:00am
Click here for hazard details and duration
Cold Weather Advisory
Winter Weather Advisory
  •  
    Cold Weather Advisory until January 19, 12:00pm
    Winter Weather Advisory January 18, 11:10pm until January 19, 12:00am

    NOW: Multiple hazards in effect

    Click HERE for Details

  • Tonight

    Low: -6 °F

    Slight Chance
    Snow and
    Patchy
    Blowing Snow

  • M.L.King Day

    M.L.King Day: Patchy blowing snow before 9am. Partly sunny and cold, with a high near 7. Wind chill values as low as -30. Windy, with a west wind 19 to 24 mph decreasing to 9 to 14 mph in the afternoon.

    High: 7 °F

    Patchy
    Blowing Snow
    and Windy
    then Partly
    Sunny and
    Blustery

  • Monday Night

    Monday Night: Mostly cloudy during the early evening, then gradual clearing, with a low around -3. Wind chill values as low as -10. West northwest wind 5 to 7 mph.

    Low: -3 °F

    Gradual
    Clearing

  • Tuesday

    Tuesday: Increasing clouds, with a high near 17. Wind chill values as low as -10. Light and variable wind becoming south 5 to 8 mph in the morning.

    High: 17 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: A 40 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 11. South southeast wind 6 to 8 mph becoming west northwest after midnight. New snow accumulation of less than one inch possible.

    Low: 11 °F

    Chance Snow

  • Wednesday

    Wednesday: A 20 percent chance of snow after noon. Partly sunny, with a high near 22. Blustery.

    High: 22 °F

    Partly Sunny
    then Slight
    Chance Snow
    and Blustery

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 2.

    Low: 2 °F

    Mostly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 15.

    High: 15 °F

    Partly Sunny

Detailed Forecast

Tonight
A slight chance of snow before midnight, then a chance of flurries between midnight and 1am. Patchy blowing snow. Mostly cloudy, with a low around -6. Wind chill values as low as -30. Windy, with a northwest wind 25 to 29 mph, with gusts as high as 37 mph. Chance of precipitation is 20%.
M.L.King Day
Patchy blowing snow before 9am. Partly sunny and cold, with a high near 7. Wind chill values as low as -30. Windy, with a west wind 19 to 24 mph decreasing to 9 to 14 mph in the afternoon.
Monday Night
Mostly cloudy during the early evening, then gradual clearing, with a low around -3. Wind chill values as low as -10. West northwest wind 5 to 7 mph.
Tuesday
Increasing clouds, with a high near 17. Wind chill values as low as -10. Light and variable wind becoming south 5 to 8 mph in the morning.
Tuesday Night
A 40 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 11. South southeast wind 6 to 8 mph becoming west northwest after midnight. New snow accumulation of less than one inch possible.
Wednesday
A 20 percent chance of snow after noon. Partly sunny, with a high near 22. Blustery.
Wednesday Night
Mostly cloudy, with a low around 2.
Thursday
Partly sunny, with a high near 15.
Thursday Night
Mostly cloudy, with a low around -1.
Friday
Partly sunny and cold, with a high near 7.
Friday Night
Partly cloudy, with a low around -12.
Saturday
Partly sunny and cold, with a high near -2.
Saturday Night
Mostly cloudy, with a low around -12.
Sunday
Mostly sunny and cold, with a high near 5.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Thornton IA
 42.95°N 93.37°W
Last Update:
9:51 pm CST Jan 18, 2026
Forecast Valid:
11pm CST Jan 18, 2026-6pm CST Jan 25, 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