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

Mason City Municipal Airport (KMCW)

Lat: 43.15°NLon: 93.33°WElev: 1188ft.

Fair

41°F

5°C

Humidity 82%
Wind Speed Calm
Barometer 29.84 in (1010.0 mb)
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Last update 30 Mar 2:53 am CDT
Extended Forecast for

Thornton IA

  • Overnight

    Overnight: Mostly clear, with a steady temperature around 46. South wind around 6 mph.

    Low: 46 °F

    Mostly Clear

  • Monday

    Monday: Increasing clouds, with a high near 80. Light south southeast wind becoming south 9 to 14 mph in the morning. Winds could gust as high as 21 mph.

    High: 80 °F

    Increasing
    Clouds

  • Monday Night

    Monday Night: A chance of showers and thunderstorms. Mostly cloudy, then gradually becoming mostly clear, with a low around 49. South southwest wind 7 to 10 mph. Chance of precipitation is 30%.

    Low: 49 °F

    Chance
    Showers

  • Tuesday

    Tuesday: A chance of showers before 7am, then a slight chance of showers and thunderstorms between 7am and 10am, then a slight chance of showers after 10am. Partly sunny, with a temperature falling to around 52 by 9am. Windy, with a west wind 11 to 16 mph becoming north 18 to 23 mph in the morning. Winds could gust as high as 32 mph. Chance of precipitation is 30%.

    High: 59 °F⇓

    Chance
    Showers and
    Windy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 31. Blustery, with a north wind 14 to 20 mph, with gusts as high as 24 mph.

    Low: 31 °F

    Mostly Cloudy
    and Blustery
    then Mostly
    Cloudy

  • Wednesday

    Wednesday: A chance of rain and snow showers after 1pm. Mostly cloudy, with a high near 42. Breezy. Chance of precipitation is 50%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 42 °F

    Mostly Cloudy
    then Chance
    Rain/Snow and
    Breezy

  • Wednesday Night

    Wednesday Night: Rain and snow showers, becoming all snow after 1am. Low around 30. Blustery. Chance of precipitation is 90%.

    Low: 30 °F

    Rain/Snow and
    Blustery

  • Thursday

    Thursday: Rain or freezing rain, becoming all rain after 1pm. High near 39. Breezy. Chance of precipitation is 80%.

    High: 39 °F

    Rain/Freezing
    Rain and
    Breezy

  • Thursday Night

    Thursday Night: A 30 percent chance of rain before 1am. Mostly cloudy, with a low around 30.

    Low: 30 °F

    Chance Rain

Detailed Forecast

Overnight
Mostly clear, with a steady temperature around 46. South wind around 6 mph.
Monday
Increasing clouds, with a high near 80. Light south southeast wind becoming south 9 to 14 mph in the morning. Winds could gust as high as 21 mph.
Monday Night
A chance of showers and thunderstorms. Mostly cloudy, then gradually becoming mostly clear, with a low around 49. South southwest wind 7 to 10 mph. Chance of precipitation is 30%.
Tuesday
A chance of showers before 7am, then a slight chance of showers and thunderstorms between 7am and 10am, then a slight chance of showers after 10am. Partly sunny, with a temperature falling to around 52 by 9am. Windy, with a west wind 11 to 16 mph becoming north 18 to 23 mph in the morning. Winds could gust as high as 32 mph. Chance of precipitation is 30%.
Tuesday Night
Mostly cloudy, with a low around 31. Blustery, with a north wind 14 to 20 mph, with gusts as high as 24 mph.
Wednesday
A chance of rain and snow showers after 1pm. Mostly cloudy, with a high near 42. Breezy. Chance of precipitation is 50%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday Night
Rain and snow showers, becoming all snow after 1am. Low around 30. Blustery. Chance of precipitation is 90%.
Thursday
Rain or freezing rain, becoming all rain after 1pm. High near 39. Breezy. Chance of precipitation is 80%.
Thursday Night
A 30 percent chance of rain before 1am. Mostly cloudy, with a low around 30.
Friday
A 40 percent chance of rain after 1pm. Mostly cloudy, with a high near 47. Breezy.
Friday Night
Rain likely and possibly a thunderstorm. Mostly cloudy, with a low around 35. Breezy. Chance of precipitation is 70%.
Saturday
A chance of rain and snow. Mostly cloudy, with a high near 46. Windy. Chance of precipitation is 50%.
Saturday Night
Mostly cloudy, with a low around 28. Windy.
Sunday
Mostly sunny, with a high near 46. Windy.
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ABOUT THIS FORECAST

 
Point Forecast:
Thornton IA
 42.95°N 93.37°W
Last Update:
3:31 am CDT Mar 30, 2026
Forecast Valid:
3am CDT Mar 30, 2026-6pm CDT Apr 5, 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