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Watching Hurricane Erin; Heavy Rainfall Threat for Upper Midwest; Heatrisk for Mississippi Valley

Hurricane Erin continues to track westward with its outer bands bringing heavy rainfall and gusty winds for Puerto Rico and US Virgin Islands. Life-threatening surf and rip currents are occurring and will spread across the Atlantic coasts this week. Meanwhile, heavy rainfall and possible flooding are in the forecast for upper Midwest through Monday. Heatrisk continues for the Mississippi Valley. Read More >

Hazardous Weather Conditions

Current conditions at

Mason City Municipal Airport (KMCW)

Lat: 43.15°NLon: 93.33°WElev: 1188ft.

Overcast

85°F

29°C

Humidity 80%
Wind Speed E 8 mph
Barometer 29.95 in (1012.8 mb)
Dewpoint 78°F (26°C)
Visibility 10.00 mi
Heat Index97°F (36°C)
Last update 17 Aug 5:53 pm CDT
Extended Forecast for

3 Miles SE Mason City Municipal Airport IA

  • Tonight

    Tonight: A 40 percent chance of showers and thunderstorms, mainly after 3am. Increasing clouds, with a low around 71. Southeast wind 7 to 11 mph. New rainfall amounts between a quarter and half of an inch possible.

    Low: 71 °F

    Chance
    T-storms

  • Monday

    Monday: A chance of showers and thunderstorms before 2pm, then a slight chance of showers and thunderstorms after 3pm. Cloudy, then gradually becoming mostly sunny, with a high near 85. South southwest wind 9 to 11 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 85 °F

    Chance
    T-storms then
    Slight Chance
    T-storms

  • Monday Night

    Monday Night: A slight chance of showers and thunderstorms between 7pm and 1am. Partly cloudy, with a low around 67. West wind around 6 mph becoming north northwest after midnight. Chance of precipitation is 20%.

    Low: 67 °F

    Slight Chance
    T-storms

  • Tuesday

    Tuesday: Mostly sunny, with a high near 80. North wind 5 to 8 mph.

    High: 80 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 59. North northeast wind 3 to 7 mph.

    Low: 59 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 78.

    High: 78 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 58.

    Low: 58 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 78.

    High: 78 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 58.

    Low: 58 °F

    Mostly Clear

Detailed Forecast

Tonight
A 40 percent chance of showers and thunderstorms, mainly after 3am. Increasing clouds, with a low around 71. Southeast wind 7 to 11 mph. New rainfall amounts between a quarter and half of an inch possible.
Monday
A chance of showers and thunderstorms before 2pm, then a slight chance of showers and thunderstorms after 3pm. Cloudy, then gradually becoming mostly sunny, with a high near 85. South southwest wind 9 to 11 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Monday Night
A slight chance of showers and thunderstorms between 7pm and 1am. Partly cloudy, with a low around 67. West wind around 6 mph becoming north northwest after midnight. Chance of precipitation is 20%.
Tuesday
Mostly sunny, with a high near 80. North wind 5 to 8 mph.
Tuesday Night
Mostly clear, with a low around 59. North northeast wind 3 to 7 mph.
Wednesday
Sunny, with a high near 78.
Wednesday Night
Mostly clear, with a low around 58.
Thursday
Sunny, with a high near 78.
Thursday Night
Mostly clear, with a low around 58.
Friday
Mostly sunny, with a high near 79.
Friday Night
Mostly clear, with a low around 56.
Saturday
Sunny, with a high near 73.
Saturday Night
Mostly clear, with a low around 50.
Sunday
Sunny, with a high near 70.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SE Mason City Municipal Airport IA
 43.13°N 93.28°W
Last Update:
6:06 pm CDT Aug 17, 2025
Forecast Valid:
6pm CDT Aug 17, 2025-6pm CDT Aug 24, 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