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

69°F

21°C

Humidity 96%
Wind Speed NE 3 mph
Barometer 29.89 in (1011.0 mb)
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Last update 12 Aug 10:53 pm CDT
Extended Forecast for

Clear Lake IA

  • Tonight

    Tonight: A 10 percent chance of showers and thunderstorms after 5am. Patchy smoke before midnight. Increasing clouds, with a steady temperature around 70. East northeast wind around 6 mph.

    Low: 70 °F

    Slight Chance
    T-storms

  • Thursday

    Thursday: Showers and thunderstorms, mainly before noon. High near 75. East wind 6 to 10 mph. Chance of precipitation is 80%. New rainfall amounts between three quarters and one inch possible.

    High: 75 °F

    Showers then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A 30 percent chance of showers and thunderstorms, mainly after 2am. Increasing clouds, with a low around 63. East wind 8 to 10 mph. New rainfall amounts between a quarter and half of an inch possible.

    Low: 63 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Friday

    Friday: Showers before 10am, then showers likely and possibly a thunderstorm between 10am and 2pm, then a chance of showers and thunderstorms after 2pm. High near 77. East wind 10 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 77 °F

    Showers

  • Friday Night

    Friday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Cloudy, with a low around 65. East southeast wind 8 to 10 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 65 °F

    Chance
    T-storms then
    Showers
    Likely

  • Saturday

    Saturday: A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 81. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 81 °F

    Chance
    Showers then
    Chance
    T-storms

  • Saturday Night

    Saturday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 65. Chance of precipitation is 60%.

    Low: 65 °F

    Showers
    Likely

  • Sunday

    Sunday: A slight chance of showers and thunderstorms. Mostly cloudy, with a high near 77. Chance of precipitation is 20%.

    High: 77 °F

    Slight Chance
    T-storms

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 57.

    Low: 57 °F

    Partly Cloudy

Detailed Forecast

Tonight
A 10 percent chance of showers and thunderstorms after 5am. Patchy smoke before midnight. Increasing clouds, with a steady temperature around 70. East northeast wind around 6 mph.
Thursday
Showers and thunderstorms, mainly before noon. High near 75. East wind 6 to 10 mph. Chance of precipitation is 80%. New rainfall amounts between three quarters and one inch possible.
Thursday Night
A 30 percent chance of showers and thunderstorms, mainly after 2am. Increasing clouds, with a low around 63. East wind 8 to 10 mph. New rainfall amounts between a quarter and half of an inch possible.
Friday
Showers before 10am, then showers likely and possibly a thunderstorm between 10am and 2pm, then a chance of showers and thunderstorms after 2pm. High near 77. East wind 10 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Cloudy, with a low around 65. East southeast wind 8 to 10 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 81. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 65. Chance of precipitation is 60%.
Sunday
A slight chance of showers and thunderstorms. Mostly cloudy, with a high near 77. Chance of precipitation is 20%.
Sunday Night
Partly cloudy, with a low around 57.
Monday
Mostly sunny, with a high near 77.
Monday Night
Partly cloudy, with a low around 58.
Tuesday
Partly sunny, with a high near 78.
Tuesday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 61.
Wednesday
A 30 percent chance of showers. Partly sunny, with a high near 79.
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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:
10:47 pm CDT Aug 12, 2026
Forecast Valid:
11pm CDT Aug 12, 2026-6pm CDT Aug 19, 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