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.

Mostly Cloudy

44°F

7°C

Humidity 83%
Wind Speed E 5 mph
Barometer 30.08 in (1019.2 mb)
Dewpoint 39°F (4°C)
Visibility 10.00 mi
Wind Chill41°F (5°C)
Last update 3 Mar 2:53 pm CST
Extended Forecast for

Thornton IA

  • This Afternoon

    This Afternoon: Mostly cloudy, with a high near 43. Calm wind.

    High: 43 °F

    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy, with a low around 29. Calm wind.

    Low: 29 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Patchy fog before 8am. Otherwise, partly sunny, with a high near 49. Calm wind becoming east southeast around 6 mph.

    High: 49 °F

    Patchy Fog
    then Mostly
    Sunny

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers after midnight. Mostly cloudy, with a low around 36. Light southeast wind.

    Low: 36 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Thursday

    Thursday: Partly sunny, with a high near 56. Calm wind becoming south southeast 5 to 9 mph in the afternoon.

    High: 56 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm, mainly after 3am. Mostly cloudy, with a low around 43. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 43 °F

    Partly Cloudy
    then Showers
    Likely

  • Friday

    Friday: Showers and possibly a thunderstorm. High near 63. Breezy. Chance of precipitation is 100%.

    High: 63 °F

    Showers then
    Showers
    Likely and
    Breezy

  • Friday Night

    Friday Night: Rain likely and possibly a thunderstorm before midnight, then a chance of rain. Mostly cloudy, with a low around 33. Breezy. Chance of precipitation is 70%.

    Low: 33 °F

    Breezy. Rain
    Likely then
    Chance Rain

  • Saturday

    Saturday: Mostly sunny, with a high near 50.

    High: 50 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 43. Calm wind.
Tonight
Mostly cloudy, with a low around 29. Calm wind.
Wednesday
Patchy fog before 8am. Otherwise, partly sunny, with a high near 49. Calm wind becoming east southeast around 6 mph.
Wednesday Night
A 20 percent chance of showers after midnight. Mostly cloudy, with a low around 36. Light southeast wind.
Thursday
Partly sunny, with a high near 56. Calm wind becoming south southeast 5 to 9 mph in the afternoon.
Thursday Night
Showers likely and possibly a thunderstorm, mainly after 3am. Mostly cloudy, with a low around 43. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Friday
Showers and possibly a thunderstorm. High near 63. Breezy. Chance of precipitation is 100%.
Friday Night
Rain likely and possibly a thunderstorm before midnight, then a chance of rain. Mostly cloudy, with a low around 33. Breezy. Chance of precipitation is 70%.
Saturday
Mostly sunny, with a high near 50.
Saturday Night
Mostly clear, with a low around 36.
Sunday
Sunny, with a high near 62. Breezy.
Sunday Night
Partly cloudy, with a low around 38.
Monday
Mostly sunny, with a high near 66. Breezy.
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ABOUT THIS FORECAST

 
Point Forecast:
Thornton IA
 42.95°N 93.37°W
Last Update:
2:27 pm CST Mar 3, 2026
Forecast Valid:
3pm CST Mar 3, 2026-6pm CDT Mar 9, 2026
 
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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