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

Denison IA

  • This Afternoon

    This Afternoon: Sunny, with a high near 83. North northwest wind 3 to 6 mph.

    High: 83 °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.

    High: 85 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A chance of showers and thunderstorms between 2am and 3am, then showers likely and possibly a thunderstorm after 3am.  Mostly cloudy, with a low around 67. South wind 8 to 11 mph, with gusts as high as 23 mph.  Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 67 °F

    Partly Cloudy
    then Showers
    Likely

  • Saturday

    Saturday: Showers likely and possibly a thunderstorm before 7am, then a chance of showers and thunderstorms between 7am and 1pm.  Mostly sunny, with a high near 90. Breezy, with a south southwest wind 13 to 16 mph, with gusts as high as 28 mph.  Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 90 °F

    Showers
    Likely and
    Breezy

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 75.

    Low: 75 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 94.

    High: 94 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 73.

    Low: 73 °F

    Partly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 90.

    High: 90 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 83. North northwest wind 3 to 6 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.
Friday Night
A chance of showers and thunderstorms between 2am and 3am, then showers likely and possibly a thunderstorm after 3am. Mostly cloudy, with a low around 67. South wind 8 to 11 mph, with gusts as high as 23 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday
Showers likely and possibly a thunderstorm before 7am, then a chance of showers and thunderstorms between 7am and 1pm. Mostly sunny, with a high near 90. Breezy, with a south southwest wind 13 to 16 mph, with gusts as high as 28 mph. Chance of precipitation is 60%. 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.
Sunday
Mostly sunny, with a high near 94.
Sunday Night
Partly cloudy, with a low around 73.
Monday
Partly sunny, with a high near 90.
Monday Night
A 40 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 70.
Tuesday
Partly sunny, with a high near 89.
Tuesday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69.
Wednesday
Mostly sunny, with a high near 90.
Basemap Options
Click map to change the forecast location
Loading map...

ABOUT THIS FORECAST

 
Point Forecast:
Denison IA
 42.03°N 95.35°W
1:26 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