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

56°F

13°C

Humidity 49%
Wind Speed SE 14 mph
Barometer 29.91 in (1012.7 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Last update 20 Apr 8:53 pm CDT
Extended Forecast for

Thornton IA

  • Tonight

    Tonight: Partly cloudy, with a low around 47. South southeast wind 10 to 14 mph becoming southwest after midnight. Winds could gust as high as 21 mph.

    Low: 47 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 77. Southwest wind 6 to 8 mph becoming north in the afternoon.

    High: 77 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 46. North northeast wind around 6 mph becoming east southeast after midnight.

    Low: 46 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 80. Breezy, with a south wind 6 to 11 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 24 mph.

    High: 80 °F

    Sunny then
    Sunny and
    Breezy

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 57. Windy, with a south wind 17 to 21 mph, with gusts as high as 25 mph.

    Low: 57 °F

    Partly Cloudy
    and Windy

  • Thursday

    Thursday: A 50 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 72. Windy. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 72 °F

    Windy. Mostly
    Cloudy then
    Chance
    Showers

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers. Mostly cloudy, with a low around 45. Windy. Chance of precipitation is 70%.

    Low: 45 °F

    Showers
    Likely and
    Windy

  • Friday

    Friday: Mostly sunny, with a high near 62. Breezy.

    High: 62 °F

    Mostly Sunny
    and Breezy

  • Friday Night

    Friday Night: Mostly clear, with a low around 39.

    Low: 39 °F

    Mostly Clear

Detailed Forecast

Tonight
Partly cloudy, with a low around 47. South southeast wind 10 to 14 mph becoming southwest after midnight. Winds could gust as high as 21 mph.
Tuesday
Sunny, with a high near 77. Southwest wind 6 to 8 mph becoming north in the afternoon.
Tuesday Night
Mostly clear, with a low around 46. North northeast wind around 6 mph becoming east southeast after midnight.
Wednesday
Sunny, with a high near 80. Breezy, with a south wind 6 to 11 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 24 mph.
Wednesday Night
Partly cloudy, with a low around 57. Windy, with a south wind 17 to 21 mph, with gusts as high as 25 mph.
Thursday
A 50 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 72. Windy. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday Night
Showers likely and possibly a thunderstorm before 1am, then a chance of showers. Mostly cloudy, with a low around 45. Windy. Chance of precipitation is 70%.
Friday
Mostly sunny, with a high near 62. Breezy.
Friday Night
Mostly clear, with a low around 39.
Saturday
Mostly sunny, with a high near 56.
Saturday Night
Mostly cloudy, with a low around 37.
Sunday
Mostly sunny, with a high near 58.
Sunday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 39.
Monday
A 30 percent chance of showers. Partly sunny, with a high near 57.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Thornton IA
 42.95°N 93.37°W
Last Update:
5:43 pm CDT Apr 20, 2026
Forecast Valid:
9pm CDT Apr 20, 2026-6pm CDT Apr 27, 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