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

48°F

9°C

Humidity 93%
Wind Speed NW 9 mph
Barometer 29.73 in (1006.4 mb)
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Wind Chill44°F (7°C)
Last update 15 Apr 7:53 am CDT
Extended Forecast for

Thornton IA

  • Today

    Today: A slight chance of showers before noon, then a chance of showers and thunderstorms after 3pm. Partly sunny, with a high near 69. East northeast wind 5 to 8 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 69 °F

    Slight Chance
    Showers then
    Chance
    T-storms

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly before 8pm. Patchy fog after 3am. Otherwise, mostly cloudy, with a low around 49. East northeast wind 5 to 7 mph becoming north after midnight. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 49 °F

    Chance
    T-storms then
    Patchy Fog

  • Thursday

    Thursday: Patchy fog before 7am. Otherwise, sunny, with a high near 74. Northwest wind 5 to 11 mph becoming south southwest in the afternoon.

    High: 74 °F

    Patchy Fog
    then Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 54. South wind 10 to 14 mph, with gusts as high as 20 mph.

    Low: 54 °F

    Mostly Clear

  • Friday

    Friday: A slight chance of showers before 10am, then a slight chance of showers and thunderstorms between 10am and 1pm, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 76. Windy, with a south southeast wind 15 to 24 mph, with gusts as high as 30 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 76 °F

    Windy. Slight
    Chance
    T-storms then
    Showers
    Likely

  • Friday Night

    Friday Night: A chance of rain showers before 4am, then a slight chance of rain and snow showers. Some thunder is also possible. Mostly cloudy, with a low around 31. Windy. Chance of precipitation is 40%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 31 °F

    Windy. Chance
    Showers then
    Chance
    Rain/Snow

  • Saturday

    Saturday: A slight chance of rain and snow showers before 1pm, then a slight chance of snow showers. Mostly sunny, with a high near 45. Windy. Chance of precipitation is 20%.

    High: 45 °F

    Slight Chance
    Rain/Snow and
    Windy

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 28. Windy.

    Low: 28 °F

    Partly Cloudy
    and Windy
    then Partly
    Cloudy

  • Sunday

    Sunday: Sunny, with a high near 52.

    High: 52 °F

    Sunny

Detailed Forecast

Today
A slight chance of showers before noon, then a chance of showers and thunderstorms after 3pm. Partly sunny, with a high near 69. East northeast wind 5 to 8 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tonight
A 30 percent chance of showers and thunderstorms, mainly before 8pm. Patchy fog after 3am. Otherwise, mostly cloudy, with a low around 49. East northeast wind 5 to 7 mph becoming north after midnight. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday
Patchy fog before 7am. Otherwise, sunny, with a high near 74. Northwest wind 5 to 11 mph becoming south southwest in the afternoon.
Thursday Night
Mostly clear, with a low around 54. South wind 10 to 14 mph, with gusts as high as 20 mph.
Friday
A slight chance of showers before 10am, then a slight chance of showers and thunderstorms between 10am and 1pm, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 76. Windy, with a south southeast wind 15 to 24 mph, with gusts as high as 30 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday Night
A chance of rain showers before 4am, then a slight chance of rain and snow showers. Some thunder is also possible. Mostly cloudy, with a low around 31. Windy. Chance of precipitation is 40%. New precipitation amounts between a quarter and half of an inch possible.
Saturday
A slight chance of rain and snow showers before 1pm, then a slight chance of snow showers. Mostly sunny, with a high near 45. Windy. Chance of precipitation is 20%.
Saturday Night
Partly cloudy, with a low around 28. Windy.
Sunday
Sunny, with a high near 52.
Sunday Night
Mostly clear, with a low around 32.
Monday
Sunny, with a high near 67. Breezy.
Monday Night
Mostly clear, with a low around 46. Breezy.
Tuesday
Sunny, with a high near 71. Breezy.
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ABOUT THIS FORECAST

 
Point Forecast:
Thornton IA
 42.95°N 93.37°W
Last Update:
6:46 am CDT Apr 15, 2026
Forecast Valid:
8am CDT Apr 15, 2026-6pm CDT Apr 21, 2026
 
Forecast Discussion
 
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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