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

Denison (KDNS)

Lat: 41.98°NLon: 95.38°WElev: 1273ft.

Fog/Mist

55°F

13°C

Humidity 100%
Wind Speed Calm
Barometer 30.17 in
Dewpoint 55°F (13°C)
Visibility 5.00 mi
Last update 28 Aug 7:15 am CDT
Extended Forecast for

Mapleton IA

  • Today

    Today: Mostly sunny, with a high near 84. Light south southeast wind becoming south 5 to 10 mph in the morning. Winds could gust as high as 20 mph.

    High: 84 °F

    Mostly Sunny

  • Tonight

    Tonight: A 40 percent chance of showers and thunderstorms, mainly after 4am. Increasing clouds, with a low around 68. South wind around 11 mph, with gusts as high as 25 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 68 °F

    Mostly Clear
    then Chance
    T-storms

  • Saturday

    Saturday: A 30 percent chance of showers and thunderstorms, mainly before 8am. Cloudy through mid morning, then gradual clearing, with a high near 90. South southeast wind 13 to 16 mph, with gusts as high as 30 mph. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 90 °F

    Chance
    T-storms then
    Sunny

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 74. South wind around 9 mph, with gusts as high as 22 mph.

    Low: 74 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Partly sunny, with a high near 92. South southwest wind 8 to 10 mph, with gusts as high as 21 mph.

    High: 92 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 72. South wind around 6 mph.

    Low: 72 °F

    Partly Cloudy

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 89. South wind around 6 mph becoming west in the afternoon.

    High: 89 °F

    Slight Chance
    T-storms

  • Monday Night

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

    Low: 68 °F

    Partly Cloudy
    then Chance
    T-storms

  • Tuesday

    Tuesday: A slight chance of showers and thunderstorms. Partly sunny, with a high near 87. Calm wind becoming southeast around 5 mph in the afternoon.

    High: 87 °F

    Slight Chance
    T-storms

Detailed Forecast

Today
Mostly sunny, with a high near 84. Light south southeast wind becoming south 5 to 10 mph in the morning. Winds could gust as high as 20 mph.
Tonight
A 40 percent chance of showers and thunderstorms, mainly after 4am. Increasing clouds, with a low around 68. South wind around 11 mph, with gusts as high as 25 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday
A 30 percent chance of showers and thunderstorms, mainly before 8am. Cloudy through mid morning, then gradual clearing, with a high near 90. South southeast wind 13 to 16 mph, with gusts as high as 30 mph. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday Night
Increasing clouds, with a low around 74. South wind around 9 mph, with gusts as high as 22 mph.
Sunday
Partly sunny, with a high near 92. South southwest wind 8 to 10 mph, with gusts as high as 21 mph.
Sunday Night
Partly cloudy, with a low around 72. South wind around 6 mph.
Monday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 89. South wind around 6 mph becoming west in the afternoon.
Monday Night
A chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 68. Light and variable wind.
Tuesday
A slight chance of showers and thunderstorms. Partly sunny, with a high near 87. Calm wind becoming southeast around 5 mph in the afternoon.
Tuesday Night
A chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 67. East northeast wind around 5 mph becoming calm in the evening.
Wednesday
Mostly sunny, with a high near 90. Calm wind becoming south around 6 mph in the afternoon.
Wednesday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 69. Southeast wind 3 to 5 mph.
Thursday
Mostly sunny, with a high near 90. South southwest wind 3 to 7 mph.
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ABOUT THIS FORECAST

 
Point Forecast:
Mapleton IA
 42.18°N 95.79°W (Elev. 1135 ft)
Last Update:
7:05 am CDT Aug 28, 2026
Forecast Valid:
7am CDT Aug 28, 2026-6pm CDT Sep 3, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation