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

50°F

10°C

Humidity 96%
Wind Speed S 14 mph
Barometer 29.86 in (1011.2 mb)
Dewpoint 49°F (9°C)
Visibility 7.00 mi
Wind Chill45°F (7°C)
Last update 12 Apr 12:53 am CDT
Extended Forecast for

Thornton IA

  • Overnight

    Overnight: A 40 percent chance of showers and thunderstorms, mainly after 2am. Mostly cloudy, with a low around 48. South wind around 15 mph, with gusts as high as 21 mph. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 48 °F

    Chance
    T-storms

  • Sunday

    Sunday: Showers and thunderstorms likely, mainly before 3pm. Mostly cloudy, with a high near 74. Windy, with a south southwest wind 18 to 28 mph, with gusts as high as 37 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 74 °F

    Windy.
    Showers
    Likely then
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A slight chance of showers and thunderstorms between 10pm and 11pm. Partly cloudy, with a low around 56. Windy, with a south southwest wind 17 to 22 mph decreasing to 9 to 14 mph after midnight. Winds could gust as high as 26 mph. Chance of precipitation is 10%.

    Low: 56 °F

    Slight Chance
    T-storms and
    Windy then
    Partly Cloudy

  • Monday

    Monday: A 30 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 77. Breezy, with a south wind 6 to 11 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 25 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 77 °F

    Partly Sunny
    then Chance
    T-storms and
    Breezy

  • Monday Night

    Monday Night: A 40 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 54. Breezy, with a south southwest wind 13 to 18 mph decreasing to 6 to 11 mph after midnight. Winds could gust as high as 24 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 54 °F

    Chance
    T-storms and
    Breezy then
    Chance
    Showers

  • Tuesday

    Tuesday: A 50 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 78. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 78 °F

    Mostly Sunny
    then Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers. Mostly cloudy, with a low around 51. Chance of precipitation is 60%.

    Low: 51 °F

    Showers
    Likely

  • Wednesday

    Wednesday: A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 71. Chance of precipitation is 50%.

    High: 71 °F

    Chance
    Showers then
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 40 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 49.

    Low: 49 °F

    Chance
    T-storms

Detailed Forecast

Overnight
A 40 percent chance of showers and thunderstorms, mainly after 2am. Mostly cloudy, with a low around 48. South wind around 15 mph, with gusts as high as 21 mph. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday
Showers and thunderstorms likely, mainly before 3pm. Mostly cloudy, with a high near 74. Windy, with a south southwest wind 18 to 28 mph, with gusts as high as 37 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Sunday Night
A slight chance of showers and thunderstorms between 10pm and 11pm. Partly cloudy, with a low around 56. Windy, with a south southwest wind 17 to 22 mph decreasing to 9 to 14 mph after midnight. Winds could gust as high as 26 mph. Chance of precipitation is 10%.
Monday
A 30 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 77. Breezy, with a south wind 6 to 11 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 25 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Monday Night
A 40 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 54. Breezy, with a south southwest wind 13 to 18 mph decreasing to 6 to 11 mph after midnight. Winds could gust as high as 24 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tuesday
A 50 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 78. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tuesday Night
Showers likely and possibly a thunderstorm before 1am, then a chance of showers. Mostly cloudy, with a low around 51. Chance of precipitation is 60%.
Wednesday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 71. Chance of precipitation is 50%.
Wednesday Night
A 40 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 49.
Thursday
Sunny, with a high near 77.
Thursday Night
Mostly clear, with a low around 55.
Friday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 72. Windy. Chance of precipitation is 60%.
Friday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 36. Breezy.
Saturday
A 30 percent chance of showers. Partly sunny, with a high near 49. Breezy.
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ABOUT THIS FORECAST

 
Point Forecast:
Thornton IA
 42.95°N 93.37°W
Last Update:
1:26 am CDT Apr 12, 2026
Forecast Valid:
1am CDT Apr 12, 2026-6pm CDT Apr 18, 2026
 
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Additional Resources

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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