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

69°F

21°C

Humidity 87%
Wind Speed SE 6 mph
Barometer 29.93 in (1012.4 mb)
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Last update 2 Aug 9:53 pm CDT
Extended Forecast for

Clear Lake IA

  • Tonight

    Tonight: Mostly clear, with a low around 59. South southeast wind around 6 mph.

    Low: 59 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 82. South wind 7 to 15 mph, with gusts as high as 22 mph.

    High: 82 °F

    Sunny

  • Monday Night

    Monday Night: Increasing clouds, with a low around 63. South southeast wind 9 to 14 mph, with gusts as high as 22 mph.

    Low: 63 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: A chance of showers, then showers likely and possibly a thunderstorm after 4pm. Partly sunny, with a high near 77. South southwest wind 7 to 9 mph becoming north in the afternoon. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 77 °F

    Chance
    Showers then
    Showers
    Likely

  • Tuesday Night

    Tuesday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 56. North wind around 6 mph becoming calm after midnight. Chance of precipitation is 70%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 56 °F

    Showers
    Likely

  • Wednesday

    Wednesday: A slight chance of thunderstorms before 7am, then a chance of showers after 1pm. Partly sunny, with a high near 76. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 76 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers before 1am. Partly cloudy, with a low around 54.

    Low: 54 °F

    Slight Chance
    Showers

  • Thursday

    Thursday: Sunny, with a high near 80.

    High: 80 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 58.

    Low: 58 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 59. South southeast wind around 6 mph.
Monday
Sunny, with a high near 82. South wind 7 to 15 mph, with gusts as high as 22 mph.
Monday Night
Increasing clouds, with a low around 63. South southeast wind 9 to 14 mph, with gusts as high as 22 mph.
Tuesday
A chance of showers, then showers likely and possibly a thunderstorm after 4pm. Partly sunny, with a high near 77. South southwest wind 7 to 9 mph becoming north in the afternoon. Chance of precipitation is 60%. 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. Mostly cloudy, with a low around 56. North wind around 6 mph becoming calm after midnight. Chance of precipitation is 70%. New rainfall amounts between a half and three quarters of an inch possible.
Wednesday
A slight chance of thunderstorms before 7am, then a chance of showers after 1pm. Partly sunny, with a high near 76. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
A 20 percent chance of showers before 1am. Partly cloudy, with a low around 54.
Thursday
Sunny, with a high near 80.
Thursday Night
Mostly clear, with a low around 58.
Friday
Mostly sunny, with a high near 82.
Friday Night
Mostly clear, with a low around 62.
Saturday
Sunny, with a high near 84.
Saturday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 64.
Sunday
Mostly sunny, with a high near 84.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Clear Lake IA
 43.15°N 93.37°W
Last Update:
10:16 pm CDT Aug 2, 2026
Forecast Valid:
10pm CDT Aug 2, 2026-6pm CDT Aug 9, 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