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

Areas of Severe Thunderstorms and Excessive Rainfall Through This Weekend

Severe thunderstorms which can bring large hail, damaging winds, and isolated tornadoes will be possible over parts of the central U.S. through this weekend. Thunderstorms with heavy to excessive rainfall moving from Texas into the mid-Mississippi Valley through this weekend may produce areas of flooding. Read More >

Hazardous Weather Conditions

Current conditions at

Mason City Municipal Airport (KMCW)

Lat: 43.15°NLon: 93.33°WElev: 1188ft.

A Few Clouds

78°F

26°C

Humidity 67%
Wind Speed SW 10 mph
Barometer 29.77 in (1007.0 mb)
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 5 Jun 8:53 pm CDT
Extended Forecast for

Grafton IA

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly before midnight. Partly cloudy, with a low around 61. West southwest wind around 5 mph becoming light and variable after midnight. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 61 °F

    Chance
    Showers then
    Slight Chance
    T-storms

  • Saturday

    Saturday: Sunny, with a high near 87. Light and variable wind becoming north northeast around 5 mph in the afternoon.

    High: 87 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 63. East southeast wind 3 to 7 mph.

    Low: 63 °F

    Partly Cloudy

  • Sunday

    Sunday: A 50 percent chance of showers and thunderstorms, mainly after 1pm. Mostly cloudy, with a high near 85. Breezy, with a south southeast wind 8 to 16 mph, with gusts as high as 22 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 85 °F

    Slight Chance
    T-storms then
    Chance
    T-storms and
    Breezy

  • Sunday Night

    Sunday Night: Showers and possibly a thunderstorm. Low around 65. Southeast wind 13 to 15 mph, with gusts as high as 21 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 65 °F

    Showers

  • Monday

    Monday: Showers and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. High near 83. 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

  • Monday Night

    Monday Night: A 30 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 65.

    Low: 65 °F

    Chance
    T-storms

  • Tuesday

    Tuesday: Mostly sunny, with a high near 89.

    High: 89 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 69.

    Low: 69 °F

    Partly Cloudy
    then Chance
    T-storms

Detailed Forecast

Tonight
A 30 percent chance of showers and thunderstorms, mainly before midnight. Partly cloudy, with a low around 61. West southwest wind around 5 mph becoming light and variable after midnight. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday
Sunny, with a high near 87. Light and variable wind becoming north northeast around 5 mph in the afternoon.
Saturday Night
Partly cloudy, with a low around 63. East southeast wind 3 to 7 mph.
Sunday
A 50 percent chance of showers and thunderstorms, mainly after 1pm. Mostly cloudy, with a high near 85. Breezy, with a south southeast wind 8 to 16 mph, with gusts as high as 22 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Sunday Night
Showers and possibly a thunderstorm. Low around 65. Southeast wind 13 to 15 mph, with gusts as high as 21 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Monday
Showers and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. High near 83. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Monday Night
A 30 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 65.
Tuesday
Mostly sunny, with a high near 89.
Tuesday Night
A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 69.
Wednesday
Mostly sunny, with a high near 93. Windy.
Wednesday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 71. Windy.
Thursday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91. Windy.
Thursday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 68. Breezy.
Friday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 86. Breezy.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Grafton IA
 43.34°N 93.07°W
Last Update:
8:11 pm CDT Jun 5, 2026
Forecast Valid:
9pm CDT Jun 5, 2026-6pm CDT Jun 12, 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