Dangerous Heat in the Southwest; Severe Thunderstorms and Heavy Rain in the Northeast and Mid-Atlantic

Dangerous heat will persist across the Southwest U.S. through Friday with daytime highs of 110-115°F. Heat across the southern Plains will briefly ease to near-normal by late week. Strong to severe thunderstorms may produce damaging wind, hail, a tornado or two, heavy rain and flash flooding across parts of the Mid-Atlantic and Northeast. Heavy rainfall threat continues across the Gulf Coast. Read More >

Current conditions at

Mason City Municipal Airport (KMCW)

Lat: 43.15°NLon: 93.33°WElev: 1188ft.

Fair

76°F

24°C

Humidity 58%
Wind Speed N 8 mph
Barometer 30.11 in (1018.8 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 27 Aug 11:53 am CDT
Extended Forecast for

4 Miles NNW Grafton IA

  • This Afternoon

    This Afternoon: Sunny, with a high near 80. Northwest wind around 9 mph.

    High: 80 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 54. Light northwest wind.

    Low: 54 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 83. Calm wind becoming south southwest around 6 mph in the afternoon.

    High: 83 °F

    Sunny

  • Friday Night

    Friday Night: A 20 percent chance of showers and thunderstorms after 1am.  Mostly cloudy, with a low around 64. South wind 7 to 13 mph, with gusts as high as 21 mph.

    Low: 64 °F

    Mostly Cloudy
    then Slight
    Chance
    T-storms

  • Saturday

    Saturday: Showers and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms between 1pm and 4pm, then a chance of showers after 4pm.  High near 82. Breezy, with a south wind 14 to 18 mph, with gusts as high as 28 mph.  Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    High: 82 °F

    Showers and
    Breezy

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 69. Breezy.

    Low: 69 °F

    Partly Cloudy
    and Breezy

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms.  Mostly sunny, with a high near 89.

    High: 89 °F

    Slight Chance
    T-storms

  • Sunday Night

    Sunday Night: A 20 percent chance of showers and thunderstorms after 1am.  Partly cloudy, with a low around 70.

    Low: 70 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Monday

    Monday: Mostly sunny, with a high near 87.

    High: 87 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 80. Northwest wind around 9 mph.
Tonight
Clear, with a low around 54. Light northwest wind.
Friday
Sunny, with a high near 83. Calm wind becoming south southwest around 6 mph in the afternoon.
Friday Night
A 20 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 64. South wind 7 to 13 mph, with gusts as high as 21 mph.
Saturday
Showers and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms between 1pm and 4pm, then a chance of showers after 4pm. High near 82. Breezy, with a south wind 14 to 18 mph, with gusts as high as 28 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Saturday Night
Partly cloudy, with a low around 69. Breezy.
Sunday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 89.
Sunday Night
A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 70.
Monday
Mostly sunny, with a high near 87.
Monday Night
A 30 percent chance of showers after 1am. Partly cloudy, with a low around 67.
Tuesday
A 30 percent chance of showers. Partly sunny, with a high near 84.
Tuesday Night
A 40 percent chance of showers. Partly cloudy, with a low around 65.
Wednesday
Mostly sunny, with a high near 85.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles NNW Grafton IA
 43.38°N 93.1°W
10:02 am CDT Aug 27, 2026
12pm CDT Aug 27, 2026-6pm CDT Sep 2, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database