National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Dangerous Heat and Possible Flooding

Dangerous heat will persist across the Southwest U.S. through Saturday with daytime highs of 110-115°F. Extreme Heat Warnings remain in effect. Dangerous heat will build across the southern Plains again beginning this weekend. Heavy to excessive rain over the Carolinas Friday may lead to isolated areas of flash flooding. Read More >

Current conditions at

Mason City Municipal Airport (KMCW)

Lat: 43.15°NLon: 93.33°WElev: 1188ft.

Fair

63°F

17°C

Humidity 84%
Wind Speed NW 3 mph
Barometer 30.08 in (1017.7 mb)
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Last update 27 Aug 8:53 pm CDT
Extended Forecast for

Grafton IA

  • Tonight

    Tonight: Patchy fog after 5am. Otherwise, clear, with a low around 54. Light west northwest wind.

    Low: 54 °F

    Clear then
    Patchy Fog

  • Friday

    Friday: Patchy fog before 7am. Otherwise, sunny, with a high near 84. Calm wind becoming southwest around 6 mph in the afternoon.

    High: 84 °F

    Patchy Fog
    then Sunny

  • Friday Night

    Friday Night: A slight chance of showers, then a chance of showers and thunderstorms after 4am. Partly cloudy, with a low around 65. South wind 6 to 10 mph, with gusts as high as 18 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 65 °F

    Partly Cloudy
    then Chance
    T-storms

  • Saturday

    Saturday: Showers and thunderstorms before 10am, then showers between 10am and 1pm, then a chance of showers and thunderstorms after 1pm. High near 81. Breezy, with a south wind 14 to 18 mph, with gusts as high as 26 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    High: 81 °F

    Showers and
    Breezy

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 70. Breezy, with a south wind 13 to 16 mph, with gusts as high as 22 mph.

    Low: 70 °F

    Partly Cloudy
    and Breezy
    then Partly
    Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 90.

    High: 90 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 72.

    Low: 72 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Monday

    Monday: A 20 percent chance of showers before 1pm. Partly sunny, with a high near 89.

    High: 89 °F

    Slight Chance
    Showers

  • Monday Night

    Monday Night: A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 68.

    Low: 68 °F

    Partly Cloudy
    then Chance
    T-storms

Detailed Forecast

Tonight
Patchy fog after 5am. Otherwise, clear, with a low around 54. Light west northwest wind.
Friday
Patchy fog before 7am. Otherwise, sunny, with a high near 84. Calm wind becoming southwest around 6 mph in the afternoon.
Friday Night
A slight chance of showers, then a chance of showers and thunderstorms after 4am. Partly cloudy, with a low around 65. South wind 6 to 10 mph, with gusts as high as 18 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday
Showers and thunderstorms before 10am, then showers between 10am and 1pm, then a chance of showers and thunderstorms after 1pm. High near 81. Breezy, with a south wind 14 to 18 mph, with gusts as high as 26 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 70. Breezy, with a south wind 13 to 16 mph, with gusts as high as 22 mph.
Sunday
Mostly sunny, with a high near 90.
Sunday Night
A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 72.
Monday
A 20 percent chance of showers before 1pm. Partly sunny, with a high near 89.
Monday Night
A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 68.
Tuesday
A 30 percent chance of showers before 1pm. Partly sunny, with a high near 86.
Tuesday Night
A 30 percent chance of showers. Partly cloudy, with a low around 67.
Wednesday
Mostly sunny, with a high near 87.
Wednesday Night
A 30 percent chance of showers. Partly cloudy, with a low around 67.
Thursday
A 30 percent chance of showers. Partly sunny, with a high near 87.
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ABOUT THIS FORECAST

 
Point Forecast:
Grafton IA
 43.34°N 93.07°W
Last Update:
9:52 pm CDT Aug 27, 2026
Forecast Valid:
10pm CDT Aug 27, 2026-6pm CDT Sep 3, 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