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

92°F

33°C

Humidity 52%
Wind Speed S 20 G 38 mph
Barometer 29.61 in (1000.9 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index100°F (38°C)
Last update 21 Jun 4:53 pm CDT
Extended Forecast for

Clear Lake IA

Heat Advisory June 21, 05:10pm until June 22, 09:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory June 21, 05:10pm until June 22, 09:00pm

    NOW until 9:00pm Sun

    Heat Advisory

  • Tonight

    Low: 76 °F

    Mostly Clear
    and Windy

  • Sunday

    Sunday: Sunny, with a high near 93. Heat index values as high as 101. Windy, with a south wind 18 to 25 mph, with gusts as high as 36 mph.

    High: 93 °F

    Sunny and
    Windy

  • Sunday Night

    Sunday Night: A 20 percent chance of showers and thunderstorms after 4am. Mostly clear, with a low around 74. Windy, with a south wind 18 to 22 mph, with gusts as high as 32 mph.

    Low: 74 °F

    Windy. Clear
    then Slight
    Chance
    T-storms

  • Monday

    Monday: Showers and thunderstorms likely, mainly between 1pm and 4pm, then showers likely and possibly a thunderstorm after 4pm. Mostly sunny, with a high near 84. Breezy, with a south southwest wind 11 to 16 mph becoming west northwest in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

    High: 84 °F

    Slight Chance
    T-storms and
    Breezy then
    T-storms
    Likely

  • Monday Night

    Monday Night: Showers and possibly a thunderstorm. Low around 64. North northwest wind 6 to 8 mph. Chance of precipitation is 80%. New rainfall amounts between three quarters and one inch possible.

    Low: 64 °F

    Showers

  • Tuesday

    Tuesday: Showers and possibly a thunderstorm. High near 77. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 77 °F

    Showers

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm. Low around 65. Chance of precipitation is 90%.

    Low: 65 °F

    Showers

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm. High near 83. Chance of precipitation is 90%.

    High: 83 °F

    Showers

Detailed Forecast

Tonight
Mostly clear, with a low around 76. Windy, with a south southwest wind 20 to 23 mph, with gusts as high as 32 mph.
Sunday
Sunny, with a high near 93. Heat index values as high as 101. Windy, with a south wind 18 to 25 mph, with gusts as high as 36 mph.
Sunday Night
A 20 percent chance of showers and thunderstorms after 4am. Mostly clear, with a low around 74. Windy, with a south wind 18 to 22 mph, with gusts as high as 32 mph.
Monday
Showers and thunderstorms likely, mainly between 1pm and 4pm, then showers likely and possibly a thunderstorm after 4pm. Mostly sunny, with a high near 84. Breezy, with a south southwest wind 11 to 16 mph becoming west northwest in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Monday Night
Showers and possibly a thunderstorm. Low around 64. North northwest wind 6 to 8 mph. Chance of precipitation is 80%. New rainfall amounts between three quarters and one inch possible.
Tuesday
Showers and possibly a thunderstorm. High near 77. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
Tuesday Night
Showers and possibly a thunderstorm. Low around 65. Chance of precipitation is 90%.
Wednesday
Showers and possibly a thunderstorm. High near 83. Chance of precipitation is 90%.
Wednesday Night
Showers and possibly a thunderstorm. Low around 66. Chance of precipitation is 80%.
Thursday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 80. Chance of precipitation is 60%.
Thursday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 63.
Friday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 82.
Friday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 64.
Saturday
A 40 percent chance of showers and thunderstorms. 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:
2:36 pm CDT Jun 21, 2025
Forecast Valid:
5pm CDT Jun 21, 2025-6pm CDT Jun 28, 2025
 
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