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.

Fog/Mist

66°F

19°C

Humidity 100%
Wind Speed Calm
Barometer 29.96 in (1013.3 mb)
Dewpoint 66°F (19°C)
Visibility 6.00 mi
Last update 1 Sep 2:53 am CDT
Extended Forecast for

Clear Lake IA

  • Overnight

    Overnight: Patchy fog. Otherwise, mostly cloudy, with a low around 68. Calm wind.

    Low: 68 °F

    Patchy Fog

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms after noon. Patchy fog before 9am. Otherwise, partly sunny, with a high near 86. Light south southwest wind.

    High: 86 °F

    Patchy Fog
    then Slight
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 50 percent chance of showers and thunderstorms, mainly after midnight. Mostly cloudy, with a low around 67. Calm wind becoming north northeast 5 to 8 mph in the evening. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 67 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Wednesday

    Wednesday: Mostly sunny, with a high near 87. East wind around 6 mph becoming light and variable in the afternoon.

    High: 87 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 68. Calm wind becoming east around 5 mph after midnight. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 68 °F

    Mostly Clear
    then Showers
    Likely

  • Thursday

    Thursday: Showers likely and possibly a thunderstorm before 1pm. Mostly sunny, with a high near 87. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 87 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: A 50 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 71.

    Low: 71 °F

    Mostly Clear
    then Chance
    T-storms

  • Friday

    Friday: A 40 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 89.

    High: 89 °F

    Chance
    T-storms

  • Friday Night

    Friday Night: Mostly clear, with a low around 70.

    Low: 70 °F

    Mostly Clear

Detailed Forecast

Overnight
Patchy fog. Otherwise, mostly cloudy, with a low around 68. Calm wind.
Tuesday
A 20 percent chance of showers and thunderstorms after noon. Patchy fog before 9am. Otherwise, partly sunny, with a high near 86. Light south southwest wind.
Tuesday Night
A 50 percent chance of showers and thunderstorms, mainly after midnight. Mostly cloudy, with a low around 67. Calm wind becoming north northeast 5 to 8 mph in the evening. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday
Mostly sunny, with a high near 87. East wind around 6 mph becoming light and variable in the afternoon.
Wednesday Night
Showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 68. Calm wind becoming east around 5 mph after midnight. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday
Showers likely and possibly a thunderstorm before 1pm. Mostly sunny, with a high near 87. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday Night
A 50 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 71.
Friday
A 40 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 89.
Friday Night
Mostly clear, with a low around 70.
Saturday
Sunny, with a high near 90.
Saturday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69.
Sunday
A 30 percent chance of showers. Mostly sunny, with a high near 85.
Sunday Night
Partly cloudy, with a low around 64.
Labor Day
Mostly sunny, with a high near 81.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Clear Lake IA
 43.13°N 93.37°W
Last Update:
3:17 am CDT Sep 1, 2026
Forecast Valid:
3am CDT Sep 1, 2026-6pm CDT Sep 7, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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