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

78°F

26°C

Humidity 97%
Wind Speed S 6 mph
Barometer 29.82 in (1008.1 mb)
Dewpoint 77°F (25°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 26 Jul 9:53 pm CDT
Extended Forecast for

Sheffield IA

Heat Advisory until July 27, 10:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory until July 27, 10:00pm

    NOW until 10:00pm Mon

    Heat Advisory

  • Tonight

    Low: 77 °F

    Partly Cloudy

  • Monday

    Monday: Patchy smoke after 2pm. Sunny, with a high near 94. Heat index values as high as 107. Southwest wind 6 to 10 mph becoming north northwest in the afternoon.

    High: 94 °F

    Mostly Sunny
    then Patchy
    Smoke

  • Monday Night

    Monday Night: Patchy smoke. Increasing clouds, with a low around 69. North northwest wind 5 to 9 mph.

    Low: 69 °F

    Patchy Smoke

  • Tuesday

    Tuesday: Cloudy through mid morning, then gradual clearing, with a high near 86. East northeast wind 3 to 5 mph.

    High: 86 °F

    Gradual
    Clearing

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 65. Light and variable wind.

    Low: 65 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 87.

    High: 87 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 66.

    Low: 66 °F

    Mostly Clear

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 85.

    High: 85 °F

    Mostly Sunny
    then Chance
    T-storms

Detailed Forecast

Tonight
Partly cloudy, with a low around 77. Calm wind becoming south southwest 5 to 8 mph after midnight.
Monday
Patchy smoke after 2pm. Sunny, with a high near 94. Heat index values as high as 107. Southwest wind 6 to 10 mph becoming north northwest in the afternoon.
Monday Night
Patchy smoke. Increasing clouds, with a low around 69. North northwest wind 5 to 9 mph.
Tuesday
Cloudy through mid morning, then gradual clearing, with a high near 86. East northeast wind 3 to 5 mph.
Tuesday Night
Mostly clear, with a low around 65. Light and variable wind.
Wednesday
Sunny, with a high near 87.
Wednesday Night
Mostly clear, with a low around 66.
Thursday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 85.
Thursday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.
Friday
A 50 percent chance of showers before 1pm. Partly sunny, with a high near 82.
Friday Night
Mostly clear, with a low around 63.
Saturday
Sunny, with a high near 84.
Saturday Night
Mostly clear, with a low around 62.
Sunday
Sunny, with a high near 84.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Sheffield IA
 42.89°N 93.23°W
Last Update:
9:37 pm CDT Jul 26, 2026
Forecast Valid:
9pm CDT Jul 26, 2026-6pm CDT Aug 2, 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