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

84°F

29°C

Humidity 74%
Wind Speed E 6 mph
Barometer 29.91 in (1011.6 mb)
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index92°F (33°C)
Last update 1 Sep 5:53 pm CDT
Extended Forecast for

Clear Lake IA

  • Tonight

    Tonight: A 40 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 69. East southeast wind 5 to 7 mph becoming north after midnight. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 69 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: A 10 percent chance of showers and thunderstorms before 7am. Mostly sunny, with a high near 87. Southeast wind 5 to 7 mph becoming west southwest in the afternoon.

    High: 87 °F

    Slight Chance
    T-storms then
    Sunny

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm between 1am and 2am, then a chance of showers and thunderstorms after 2am. Increasing clouds, with a low around 69. Light and variable wind becoming east southeast around 5 mph after midnight. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 69 °F

    Mostly Clear
    then Showers
    Likely

  • Thursday

    Thursday: A 50 percent chance of showers and thunderstorms before 1pm. Mostly cloudy, then gradually becoming sunny, with a high near 87. East southeast wind 5 to 10 mph becoming south in the afternoon. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 87 °F

    Chance
    T-storms then
    Chance
    Showers

  • Thursday Night

    Thursday Night: A 50 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 70. South wind around 8 mph. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 70 °F

    Mostly Clear
    then Chance
    T-storms

  • Friday

    Friday: A 40 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 87. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 87 °F

    Chance
    T-storms then
    Chance
    Showers

  • Friday Night

    Friday Night: Partly cloudy, with a low around 69.

    Low: 69 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 88.

    High: 88 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 68.

    Low: 68 °F

    Partly Cloudy
    then Chance
    T-storms

Detailed Forecast

Tonight
A 40 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 69. East southeast wind 5 to 7 mph becoming north after midnight. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday
A 10 percent chance of showers and thunderstorms before 7am. Mostly sunny, with a high near 87. Southeast wind 5 to 7 mph becoming west southwest in the afternoon.
Wednesday Night
Showers likely and possibly a thunderstorm between 1am and 2am, then a chance of showers and thunderstorms after 2am. Increasing clouds, with a low around 69. Light and variable wind becoming east southeast around 5 mph after midnight. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday
A 50 percent chance of showers and thunderstorms before 1pm. Mostly cloudy, then gradually becoming sunny, with a high near 87. East southeast wind 5 to 10 mph becoming south in the afternoon. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday Night
A 50 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 70. South wind around 8 mph. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday
A 40 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 87. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday Night
Partly cloudy, with a low around 69.
Saturday
Mostly sunny, with a high near 88.
Saturday Night
A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 68.
Sunday
A 40 percent chance of showers. Mostly sunny, with a high near 84.
Sunday Night
Partly cloudy, with a low around 64.
Labor Day
Partly sunny, with a high near 79.
Monday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 62.
Tuesday
A 30 percent chance of showers. Partly sunny, with a high near 80.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Clear Lake IA
 43.13°N 93.37°W
Last Update:
5:32 pm CDT Sep 1, 2026
Forecast Valid:
6pm CDT Sep 1, 2026-6pm CDT Sep 8, 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