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.

Thunderstorm Heavy Rain Fog/Mist and Breezy

67°F

19°C

Humidity 91%
Wind Speed W 23 G 51 mph
Barometer 30.03 in (1015.7 mb)
Dewpoint 64°F (18°C)
Visibility 3.00 mi
Last update 2 Sep 3:53 am CDT
Extended Forecast for

Clear Lake IA

Severe T-storm Watch until September 2, 05:00am
Click here for hazard details and duration
Severe T-storm Watch
  •  
    Severe T-storm Watch until September 2, 05:00am

    NOW until 5:00am Wed

    Severe T-storm Watch

  • Overnight

    Low: 70 °F

    Severe
    Thunderstorms

  • Wednesday

    Wednesday: A 30 percent chance of showers and thunderstorms, mainly before 9am. Some of the storms could produce heavy rainfall. Mostly cloudy, then gradually becoming sunny, with a high near 85. East wind around 6 mph becoming calm in the afternoon. New precipitation amounts in excess of 4 inches possible.

    High: 85 °F

    Heavy Rain
    then Sunny

  • Wednesday Night

    Wednesday Night: A 40 percent chance of showers and thunderstorms, mainly after 1am. Increasing clouds, with a low around 69. East southeast wind 3 to 6 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 69 °F

    Mostly Clear
    then Chance
    T-storms

  • Thursday

    Thursday: Showers and thunderstorms likely, mainly before 10am. Mostly cloudy, then gradual clearing during the afternoon, with a high near 85. South wind 6 to 9 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 85 °F

    Showers
    Likely then
    Sunny

  • Thursday Night

    Thursday Night: A 50 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 71. South southeast wind around 8 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 71 °F

    Mostly Clear
    then Chance
    T-storms

  • Friday

    Friday: A 30 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 88. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 88 °F

    Chance
    Showers

  • Friday Night

    Friday Night: Partly cloudy, with a low around 70.

    Low: 70 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 88.

    High: 88 °F

    Mostly Sunny

Detailed Forecast

Overnight
Showers likely and possibly a thunderstorm. Some of the storms could be severe. Mostly cloudy, with a steady temperature around 70. Northeast wind 10 to 13 mph. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday
A 30 percent chance of showers and thunderstorms, mainly before 9am. Some of the storms could produce heavy rainfall. Mostly cloudy, then gradually becoming sunny, with a high near 85. East wind around 6 mph becoming calm in the afternoon. New precipitation amounts in excess of 4 inches possible.
Wednesday Night
A 40 percent chance of showers and thunderstorms, mainly after 1am. Increasing clouds, with a low around 69. East southeast wind 3 to 6 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday
Showers and thunderstorms likely, mainly before 10am. Mostly cloudy, then gradual clearing during the afternoon, with a high near 85. South wind 6 to 9 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday Night
A 50 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 71. South southeast wind around 8 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday
A 30 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 88. 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 70.
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 50 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 85.
Sunday Night
A 40 percent chance of showers. Partly cloudy, with a low around 66.
Labor Day
A 30 percent chance of showers. Partly sunny, with a high near 81.
Monday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 64.
Tuesday
A 30 percent chance of showers. Partly sunny, with a high near 81.
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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:
3:06 am CDT Sep 2, 2026
Forecast Valid:
3am CDT Sep 2, 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