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

Denison (KDNS)

Lat: 41.98°NLon: 95.38°WElev: 1273ft.

A Few Clouds

81°F

27°C

Humidity 51%
Wind Speed Vrbl 5 G 12 mph
Barometer 30.15 in
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 27 Aug 1:15 pm CDT
Extended Forecast for

Defiance IA

  • This Afternoon

    This Afternoon: Sunny, with a high near 82. North wind 3 to 5 mph.

    High: 82 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 58. Calm wind.

    Low: 58 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 85. Calm wind becoming south 5 to 9 mph in the morning. Winds could gust as high as 16 mph.

    High: 85 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms, mainly between 3am and 5am.  Increasing clouds, with a low around 67. South wind 8 to 13 mph, with gusts as high as 23 mph.  New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 67 °F

    Partly Cloudy
    then Chance
    T-storms

  • Saturday

    Saturday: A 30 percent chance of showers and thunderstorms, mainly between 7am and 1pm.  Mostly sunny, with a high near 89. Breezy, with a south southeast wind 15 to 18 mph, with gusts as high as 26 mph.  New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 89 °F

    Chance
    T-storms then
    Chance
    Showers and
    Breezy

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 75. South wind 11 to 14 mph, with gusts as high as 23 mph.

    Low: 75 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 93. South southwest wind 11 to 13 mph, with gusts as high as 21 mph.

    High: 93 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: A slight chance of showers and thunderstorms after 1am.  Mostly cloudy, with a low around 73. South southwest wind 7 to 9 mph, with gusts as high as 17 mph.

    Low: 73 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Monday

    Monday: A slight chance of showers and thunderstorms.  Partly sunny, with a high near 90. South southwest wind 6 to 8 mph.

    High: 90 °F

    Slight Chance
    T-storms

Detailed Forecast

This Afternoon
Sunny, with a high near 82. North wind 3 to 5 mph.
Tonight
Mostly clear, with a low around 58. Calm wind.
Friday
Mostly sunny, with a high near 85. Calm wind becoming south 5 to 9 mph in the morning. Winds could gust as high as 16 mph.
Friday Night
A 30 percent chance of showers and thunderstorms, mainly between 3am and 5am. Increasing clouds, with a low around 67. South wind 8 to 13 mph, with gusts as high as 23 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 between 7am and 1pm. Mostly sunny, with a high near 89. Breezy, with a south southeast wind 15 to 18 mph, with gusts as high as 26 mph. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday Night
Partly cloudy, with a low around 75. South wind 11 to 14 mph, with gusts as high as 23 mph.
Sunday
Mostly sunny, with a high near 93. South southwest wind 11 to 13 mph, with gusts as high as 21 mph.
Sunday Night
A slight chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 73. South southwest wind 7 to 9 mph, with gusts as high as 17 mph.
Monday
A slight chance of showers and thunderstorms. Partly sunny, with a high near 90. South southwest wind 6 to 8 mph.
Monday Night
A chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 70. Southeast wind around 5 mph becoming calm in the evening.
Tuesday
A slight chance of showers and thunderstorms. Partly sunny, with a high near 88. Calm wind becoming south southeast around 6 mph in the morning.
Tuesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 69. Light east southeast wind.
Wednesday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 89. Calm wind becoming south 5 to 7 mph in the afternoon.
Basemap Options
Click map to change the forecast location
Loading map...

ABOUT THIS FORECAST

 
Point Forecast:
Defiance IA
 41.83°N 95.35°W (Elev. 1293 ft)
1:17 pm CDT Aug 27, 2026
1pm CDT Aug 27, 2026-6pm CDT Sep 2, 2026
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database