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.

Overcast

60°F

16°C

Humidity 56%
Wind Speed S 9 mph
Barometer 29.75 in (1006.5 mb)
Dewpoint 44°F (7°C)
Visibility 10.00 mi
Last update 15 May 2:53 am CDT
Extended Forecast for

Clear Lake IA

  • Overnight

    Overnight: Mostly clear, with a steady temperature around 57. South wind around 10 mph, with gusts as high as 18 mph.

    Low: 57 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 87. South wind 8 to 14 mph, with gusts as high as 18 mph.

    High: 87 °F

    Sunny

  • Friday Night

    Friday Night: Showers and thunderstorms likely, mainly before midnight. Cloudy, then gradually becoming partly cloudy, with a low around 52. South wind 8 to 13 mph becoming light and variable. Winds could gust as high as 18 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 52 °F

    T-storms
    Likely then
    Slight Chance
    T-storms

  • Saturday

    Saturday: A slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Increasing clouds, with a high near 82. North northwest wind 6 to 9 mph becoming east northeast in the afternoon. Chance of precipitation is 20%.

    High: 82 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 54. East wind 8 to 14 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 54 °F

    Chance
    T-storms then
    Showers
    Likely

  • Sunday

    Sunday: Showers and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. High near 83. Windy. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 83 °F

    Showers and
    Windy

  • Sunday Night

    Sunday Night: Showers and possibly a thunderstorm. Low around 58. Windy. Chance of precipitation is 80%.

    Low: 58 °F

    Showers and
    Windy

  • Monday

    Monday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 83. Windy. Chance of precipitation is 70%.

    High: 83 °F

    Showers
    Likely and
    Windy

  • Monday Night

    Monday Night: Showers and possibly a thunderstorm before 1am, then showers likely. Low around 52. Windy. Chance of precipitation is 80%.

    Low: 52 °F

    Showers and
    Windy

Detailed Forecast

Overnight
Mostly clear, with a steady temperature around 57. South wind around 10 mph, with gusts as high as 18 mph.
Friday
Sunny, with a high near 87. South wind 8 to 14 mph, with gusts as high as 18 mph.
Friday Night
Showers and thunderstorms likely, mainly before midnight. Cloudy, then gradually becoming partly cloudy, with a low around 52. South wind 8 to 13 mph becoming light and variable. Winds could gust as high as 18 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Saturday
A slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Increasing clouds, with a high near 82. North northwest wind 6 to 9 mph becoming east northeast in the afternoon. Chance of precipitation is 20%.
Saturday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 54. East wind 8 to 14 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday
Showers and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. High near 83. Windy. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday Night
Showers and possibly a thunderstorm. Low around 58. Windy. Chance of precipitation is 80%.
Monday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 83. Windy. Chance of precipitation is 70%.
Monday Night
Showers and possibly a thunderstorm before 1am, then showers likely. Low around 52. Windy. Chance of precipitation is 80%.
Tuesday
Mostly cloudy, with a high near 68. Windy.
Tuesday Night
Mostly cloudy, with a low around 40. Windy.
Wednesday
Mostly sunny, with a high near 63.
Wednesday Night
Partly cloudy, with a low around 41.
Thursday
Mostly sunny, with a high near 69.
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:
1:51 am CDT May 15, 2026
Forecast Valid:
3am CDT May 15, 2026-6pm CDT May 21, 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