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

Air Quality Concerns; Fire Weather; Extreme Heat; Flash Flooding

Wildfire smoke continues to result in poor air quality from the Upper Midwest into the Northeast. Dangerous heat and fire weather concerns for portions of the Four Corners region into the central Great Basin. Heavy rainfall and flash flooding possible for the Southeast through Monday. For Hawaii, gusty trade winds a drier weather could result in any fires that start to spread rapidly. Read More >

Hazardous Weather Conditions

Current conditions at

Harlan, Harlan Municipal Airport (KHNR)

Lat: 41.58°NLon: 95.34°WElev: 1230ft.

Fair

64°F

18°C

Humidity 88%
Wind Speed Calm
Barometer 30.10 in
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 3 Aug 9:15 pm CDT
Extended Forecast for

Portsmouth IA

  • Tonight

    Tonight: Mostly cloudy, with a low around 56. Southeast wind 3 to 5 mph.

    Low: 56 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, then gradually becoming sunny, with a high near 78. South southeast wind 3 to 7 mph.

    High: 78 °F

    Decreasing
    Clouds

  • Monday Night

    Monday Night: Mostly clear, with a low around 58. Southeast wind 3 to 6 mph.

    Low: 58 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 80. South southeast wind 5 to 10 mph, with gusts as high as 17 mph.

    High: 80 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 63. South southeast wind 7 to 9 mph.

    Low: 63 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 86. South wind 7 to 13 mph, with gusts as high as 20 mph.

    High: 86 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 69. South southeast wind 7 to 9 mph.

    Low: 69 °F

    Mostly Clear
    then Slight
    Chance
    T-storms

  • Thursday

    Thursday: Sunny, with a high near 90. South wind 7 to 13 mph, with gusts as high as 20 mph.

    High: 90 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 71. South southeast wind around 10 mph, with gusts as high as 18 mph.

    Low: 71 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, with a low around 56. Southeast wind 3 to 5 mph.
Monday
Mostly cloudy, then gradually becoming sunny, with a high near 78. South southeast wind 3 to 7 mph.
Monday Night
Mostly clear, with a low around 58. Southeast wind 3 to 6 mph.
Tuesday
Mostly sunny, with a high near 80. South southeast wind 5 to 10 mph, with gusts as high as 17 mph.
Tuesday Night
Partly cloudy, with a low around 63. South southeast wind 7 to 9 mph.
Wednesday
Mostly sunny, with a high near 86. South wind 7 to 13 mph, with gusts as high as 20 mph.
Wednesday Night
A 20 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 69. South southeast wind 7 to 9 mph.
Thursday
Sunny, with a high near 90. South wind 7 to 13 mph, with gusts as high as 20 mph.
Thursday Night
Mostly clear, with a low around 71. South southeast wind around 10 mph, with gusts as high as 18 mph.
Friday
Mostly sunny, with a high near 91. South wind 10 to 15 mph, with gusts as high as 23 mph.
Friday Night
Partly cloudy, with a low around 71. South southeast wind 10 to 13 mph, with gusts as high as 20 mph.
Saturday
Mostly sunny, with a high near 90. South wind 10 to 13 mph, with gusts as high as 21 mph.
Saturday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 67. South southeast wind 7 to 10 mph, with gusts as high as 17 mph.
Sunday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 84. South southwest wind 6 to 9 mph.
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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:
9:01 pm CDT Aug 3, 2025
Forecast Valid:
9pm CDT Aug 3, 2025-6pm CDT Aug 10, 2025
 
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