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.

Partly Cloudy

84°F

29°C

Humidity 72%
Wind Speed SW 8 mph
Barometer 29.90 in (1011.1 mb)
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index91°F (33°C)
Last update 25 Jul 4:53 pm CDT
Extended Forecast for

Clear Lake IA

Extreme Heat Watch July 26, 09:00pm until July 27, 10:00pm
Heat Advisory July 25, 05:19pm until July 26, 12:00pm
Extreme Heat Warning July 26, 12:00pm until July 26, 09:00pm
Click here for hazard details and duration
Extreme Heat Watch
Heat Advisory
Extreme Heat Warning
  •  
    Heat Advisory July 25, 05:19pm until July 26, 12:00pm

    NOW until 12:00pm Sun

    Heat Advisory

  • Tonight

    Low: 73 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Sunday

    Sunday: A 10 percent chance of showers and thunderstorms before 7am. Mostly cloudy, then gradually becoming sunny, with a high near 92. Heat index values as high as 111. South wind 7 to 10 mph becoming west in the morning.

    High: 92 °F

    Slight Chance
    T-storms then
    Mostly Sunny

  • Sunday Night

    Sunday Night: A 10 percent chance of showers after 5am. Mostly cloudy, with a low around 74. South southwest wind around 11 mph, with gusts as high as 18 mph.

    Low: 74 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Monday

    Monday: A 10 percent chance of showers before 7am. Partly sunny, then gradually becoming sunny, with a high near 91. Heat index values as high as 102. South wind 8 to 11 mph becoming northwest in the afternoon. Winds could gust as high as 18 mph.

    High: 91 °F

    Slight Chance
    Showers then
    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 69. North northwest wind 6 to 10 mph.

    Low: 69 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 86.

    High: 86 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 65.

    Low: 65 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 86.

    High: 86 °F

    Sunny

Detailed Forecast

Tonight
A 20 percent chance of showers and thunderstorms after 3am. Increasing clouds, with a low around 73. South wind 5 to 7 mph.
Sunday
A 10 percent chance of showers and thunderstorms before 7am. Mostly cloudy, then gradually becoming sunny, with a high near 92. Heat index values as high as 111. South wind 7 to 10 mph becoming west in the morning.
Sunday Night
A 10 percent chance of showers after 5am. Mostly cloudy, with a low around 74. South southwest wind around 11 mph, with gusts as high as 18 mph.
Monday
A 10 percent chance of showers before 7am. Partly sunny, then gradually becoming sunny, with a high near 91. Heat index values as high as 102. South wind 8 to 11 mph becoming northwest in the afternoon. Winds could gust as high as 18 mph.
Monday Night
Mostly clear, with a low around 69. North northwest wind 6 to 10 mph.
Tuesday
Mostly sunny, with a high near 86.
Tuesday Night
Mostly clear, with a low around 65.
Wednesday
Sunny, with a high near 86.
Wednesday Night
Mostly clear, with a low around 66.
Thursday
Mostly sunny, with a high near 85.
Thursday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 66.
Friday
A 30 percent chance of showers. Mostly sunny, with a high near 84.
Friday Night
Mostly clear, with a low around 64.
Saturday
Sunny, with a high near 85.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Clear Lake IA
 43.13°N 93.37°W
Last Update:
4:06 pm CDT Jul 25, 2026
Forecast Valid:
5pm CDT Jul 25, 2026-6pm CDT Aug 1, 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