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

Severe Thunderstorms in the Midwest and Arizona; Heat Continues in the Southeast and Southwest

Thunderstorms, some severe, may lead to scattered instances of flash flooding across the Midwest and Ohio Valley and southern Arizona. The threat will shift to the Mid-Atlantic coast on Thursday. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that little-to-no relief from the scorching daytime highs will be available. Read More >

Current conditions at

Harlan, Harlan Municipal Airport (KHNR)

Lat: 41.58°NLon: 95.34°WElev: 1230ft.

Fair

66°F

19°C

Humidity 100%
Wind Speed N 5 mph
Barometer 30.01 in
Dewpoint 66°F (19°C)
Visibility 7.00 mi
Last update 19 Aug 11:15 pm CDT
Extended Forecast for

Portsmouth IA

  • Tonight

    Tonight: Mostly clear, with a low around 60. Calm wind.

    Low: 60 °F

    Mostly Clear

  • Thursday

    Thursday: Patchy fog before 8am. Otherwise, sunny, with a high near 81. Calm wind becoming south 5 to 7 mph in the morning.

    High: 81 °F

    Patchy Fog
    then Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 64. Light south southwest wind.

    Low: 64 °F

    Mostly Clear

  • Friday

    Friday: A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 84. Calm wind becoming west around 5 mph.

    High: 84 °F

    Sunny then
    Slight Chance
    T-storms

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 63. Calm wind. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 63 °F

    Chance
    T-storms

  • Saturday

    Saturday: Sunny, with a high near 80. Calm wind becoming north northeast around 6 mph in the afternoon.

    High: 80 °F

    Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 60. Light and variable wind.

    Low: 60 °F

    Mostly Clear
    then Slight
    Chance
    T-storms

  • Sunday

    Sunday: A slight chance of showers. Partly sunny, with a high near 77. Calm wind becoming east southeast 5 to 7 mph in the afternoon.

    High: 77 °F

    Slight Chance
    Showers

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 62. East southeast wind around 7 mph.

    Low: 62 °F

    Mostly Cloudy
    then Chance
    Showers

Detailed Forecast

Tonight
Mostly clear, with a low around 60. Calm wind.
Thursday
Patchy fog before 8am. Otherwise, sunny, with a high near 81. Calm wind becoming south 5 to 7 mph in the morning.
Thursday Night
Mostly clear, with a low around 64. Light south southwest wind.
Friday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 84. Calm wind becoming west around 5 mph.
Friday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 63. Calm wind. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday
Sunny, with a high near 80. Calm wind becoming north northeast around 6 mph in the afternoon.
Saturday Night
A 20 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 60. Light and variable wind.
Sunday
A slight chance of showers. Partly sunny, with a high near 77. Calm wind becoming east southeast 5 to 7 mph in the afternoon.
Sunday Night
A chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 62. East southeast wind around 7 mph.
Monday
A slight chance of showers and thunderstorms. Partly sunny, with a high near 79. East southeast wind around 9 mph.
Monday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 63. East southeast wind around 6 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 82. Calm wind becoming southeast around 6 mph in the afternoon.
Tuesday Night
Partly cloudy, with a low around 64. Light east wind.
Wednesday
Mostly sunny, with a high near 82. Calm wind becoming east northeast around 6 mph in the afternoon.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Portsmouth IA
 41.65°N 95.53°W (Elev. 1250 ft)
Last Update:
10:35 pm CDT Aug 19, 2026
Forecast Valid:
11pm CDT Aug 19, 2026-6pm CDT Aug 26, 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