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

Denison (KDNS)

Lat: 41.98°NLon: 95.38°WElev: 1273ft.

Fair

73°F

23°C

Humidity 53%
Wind Speed S 8 mph
Barometer 29.94 in
Dewpoint 55°F (13°C)
Visibility NA
Last update 20 Jun 6:15 pm CDT
Extended Forecast for

Defiance IA

  • Tonight

    Tonight: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after midnight. Low around 57. Light southeast wind becoming east 5 to 10 mph in the evening. Winds could gust as high as 18 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 57 °F

    Chance
    Showers then
    Showers

  • Sunday

    Sunday: Showers likely, mainly before 11am. Mostly cloudy, with a high near 67. Breezy, with an east wind 15 to 18 mph, with gusts as high as 28 mph. Chance of precipitation is 60%. New precipitation amounts between a half and three quarters of an inch possible.

    High: 67 °F

    Showers
    Likely then
    Chance
    Showers and
    Breezy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 52. East wind 8 to 13 mph becoming light northeast after midnight. Winds could gust as high as 21 mph.

    Low: 52 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, then gradually becoming sunny, with a high near 75. East northeast wind 3 to 5 mph.

    High: 75 °F

    Decreasing
    Clouds

  • Monday Night

    Monday Night: Partly cloudy, with a low around 54. Light east southeast wind.

    Low: 54 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 75. Calm wind becoming south southwest 5 to 7 mph in the afternoon.

    High: 75 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 55. West southwest wind 3 to 6 mph.

    Low: 55 °F

    Slight Chance
    T-storms

  • Wednesday

    Wednesday: Sunny, with a high near 75. Light west northwest wind becoming northwest 5 to 10 mph in the morning. Winds could gust as high as 20 mph.

    High: 75 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 52. North northwest wind 5 to 7 mph becoming calm in the evening.

    Low: 52 °F

    Mostly Clear

Detailed Forecast

Tonight
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after midnight. Low around 57. Light southeast wind becoming east 5 to 10 mph in the evening. Winds could gust as high as 18 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Sunday
Showers likely, mainly before 11am. Mostly cloudy, with a high near 67. Breezy, with an east wind 15 to 18 mph, with gusts as high as 28 mph. Chance of precipitation is 60%. New precipitation amounts between a half and three quarters of an inch possible.
Sunday Night
Mostly cloudy, with a low around 52. East wind 8 to 13 mph becoming light northeast after midnight. Winds could gust as high as 21 mph.
Monday
Mostly cloudy, then gradually becoming sunny, with a high near 75. East northeast wind 3 to 5 mph.
Monday Night
Partly cloudy, with a low around 54. Light east southeast wind.
Tuesday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 75. Calm wind becoming south southwest 5 to 7 mph in the afternoon.
Tuesday Night
A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 55. West southwest wind 3 to 6 mph.
Wednesday
Sunny, with a high near 75. Light west northwest wind becoming northwest 5 to 10 mph in the morning. Winds could gust as high as 20 mph.
Wednesday Night
Mostly clear, with a low around 52. North northwest wind 5 to 7 mph becoming calm in the evening.
Thursday
Mostly sunny, with a high near 76. Calm wind becoming north around 5 mph.
Thursday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 55. Calm wind.
Friday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 78. Calm wind becoming southeast 5 to 9 mph in the morning. Winds could gust as high as 17 mph.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 61. Southeast wind 5 to 7 mph.
Saturday
A slight chance of showers and thunderstorms. Partly sunny, with a high near 82. South southeast wind 7 to 13 mph, with gusts as high as 21 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Defiance IA
 41.83°N 95.35°W (Elev. 1293 ft)
Last Update:
5:31 pm CDT Jun 20, 2026
Forecast Valid:
6pm CDT Jun 20, 2026-6pm CDT Jun 27, 2026
 
Forecast Discussion
 
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Additional Resources

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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