Areas of Dangerous Heat and Severe Thunderstorms

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 before returning over much of the Plains into next week. Scattered strong to severe thunderstorms are possible across parts of the Northeast U.S. on Thursday. Damaging wind, hail, and a tornado or two are possible. Read More >

Current conditions at

Harlan, Harlan Municipal Airport (KHNR)

Lat: 41.58°NLon: 95.34°WElev: 1230ft.

Fair

63°F

17°C

Humidity 100%
Wind Speed Calm
Barometer 30.09 in
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 26 Aug 11:55 pm CDT
Extended Forecast for

Portsmouth IA

  • Overnight

    Overnight: Mostly clear, with a low around 59. Calm wind.

    Low: 59 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 83. Calm wind becoming northwest around 5 mph in the afternoon.

    High: 83 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 59. Calm wind.

    Low: 59 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 85. Light south southeast wind becoming south 5 to 10 mph in the morning. Winds could gust as high as 16 mph.

    High: 85 °F

    Sunny

  • Friday Night

    Friday Night: A 20 percent chance of showers and thunderstorms after 1am.  Partly cloudy, with a low around 68. South southeast wind 9 to 15 mph, with gusts as high as 23 mph.

    Low: 68 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Saturday

    Saturday: A 40 percent chance of showers and thunderstorms before 1pm.  Mostly sunny, with a high near 89. Breezy, with a south wind 16 to 20 mph, with gusts as high as 28 mph.  New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 89 °F

    Chance
    T-storms and
    Breezy

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 75. South wind around 17 mph, with gusts as high as 25 mph.

    Low: 75 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 96. South southwest wind around 16 mph, with gusts as high as 23 mph.

    High: 96 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms.  Partly cloudy, with a low around 73. South wind around 11 mph, with gusts as high as 18 mph.

    Low: 73 °F

    Chance
    T-storms

Detailed Forecast

Overnight
Mostly clear, with a low around 59. Calm wind.
Thursday
Sunny, with a high near 83. Calm wind becoming northwest around 5 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 59. Calm wind.
Friday
Sunny, with a high near 85. Light south southeast wind becoming south 5 to 10 mph in the morning. Winds could gust as high as 16 mph.
Friday Night
A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 68. South southeast wind 9 to 15 mph, with gusts as high as 23 mph.
Saturday
A 40 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 89. Breezy, with a south wind 16 to 20 mph, with gusts as high as 28 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday Night
Partly cloudy, with a low around 75. South wind around 17 mph, with gusts as high as 25 mph.
Sunday
Mostly sunny, with a high near 96. South southwest wind around 16 mph, with gusts as high as 23 mph.
Sunday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 73. South wind around 11 mph, with gusts as high as 18 mph.
Monday
A slight chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 91. Southwest wind 7 to 9 mph, with gusts as high as 16 mph.
Monday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 68. West wind around 5 mph becoming calm in the evening.
Tuesday
A slight chance of showers and thunderstorms. Partly sunny, with a high near 89. Calm wind becoming southeast 5 to 7 mph in the afternoon.
Tuesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 68. East southeast wind 3 to 6 mph.
Wednesday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 89. South wind 5 to 9 mph.
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ABOUT THIS FORECAST

 
Point Forecast:
Portsmouth IA
 41.65°N 95.53°W (Elev. 1250 ft)
12:06 am CDT Aug 27, 2026
12am CDT Aug 27, 2026-6pm CDT Sep 2, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database