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

Harlan, Harlan Municipal Airport (KHNR)

Lat: 41.58°NLon: 95.34°WElev: 1230ft.

Fair

52°F

11°C

Humidity 100%
Wind Speed Calm
Barometer 30.04 in
Dewpoint 52°F (11°C)
Visibility 10.00 mi
Last update 20 Jun 12:55 am CDT
Extended Forecast for

Portsmouth IA

  • Overnight

    Overnight: Mostly clear, with a low around 55. Calm wind.

    Low: 55 °F

    Mostly Clear

  • Saturday

    Saturday: Patchy fog before 8am. Otherwise, increasing clouds, with a high near 80. Light and variable wind.

    High: 80 °F

    Patchy Fog
    then Mostly
    Sunny

  • Saturday Night

    Saturday Night: Showers and thunderstorms before 4am, then showers and possibly a thunderstorm, mainly after 4am. Some of the storms could produce heavy rainfall. Low around 58. South southeast wind 5 to 14 mph becoming east in the evening. Winds could gust as high as 20 mph. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.

    Low: 58 °F

    Showers
    Likely then
    Heavy Rain

  • Sunday

    Sunday: Showers and thunderstorms before noon, then a chance of showers. Some of the storms could produce heavy rainfall. High near 70. Breezy, with an east northeast wind 16 to 18 mph, with gusts as high as 26 mph. Chance of precipitation is 80%. New precipitation amounts between a half and three quarters of an inch possible.

    High: 70 °F

    Heavy Rain
    then Chance
    Showers and
    Breezy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 53. East northeast wind 9 to 14 mph becoming light northeast after midnight. Winds could gust as high as 21 mph.

    Low: 53 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 75. East northeast wind 3 to 6 mph.

    High: 75 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 55. Light east wind.

    Low: 55 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 77. Calm wind becoming southwest 5 to 8 mph in the afternoon.

    High: 77 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 56. West southwest wind around 6 mph becoming calm in the evening.

    Low: 56 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly clear, with a low around 55. Calm wind.
Saturday
Patchy fog before 8am. Otherwise, increasing clouds, with a high near 80. Light and variable wind.
Saturday Night
Showers and thunderstorms before 4am, then showers and possibly a thunderstorm, mainly after 4am. Some of the storms could produce heavy rainfall. Low around 58. South southeast wind 5 to 14 mph becoming east in the evening. Winds could gust as high as 20 mph. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.
Sunday
Showers and thunderstorms before noon, then a chance of showers. Some of the storms could produce heavy rainfall. High near 70. Breezy, with an east northeast wind 16 to 18 mph, with gusts as high as 26 mph. Chance of precipitation is 80%. New precipitation amounts between a half and three quarters of an inch possible.
Sunday Night
Mostly cloudy, with a low around 53. East northeast wind 9 to 14 mph becoming light northeast after midnight. Winds could gust as high as 21 mph.
Monday
Mostly sunny, with a high near 75. East northeast wind 3 to 6 mph.
Monday Night
Partly cloudy, with a low around 55. Light east wind.
Tuesday
A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 77. Calm wind becoming southwest 5 to 8 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 56. West southwest wind around 6 mph becoming calm in the evening.
Wednesday
Mostly sunny, with a high near 77. Light west wind becoming northwest 5 to 9 mph in the morning. Winds could gust as high as 16 mph.
Wednesday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 54. North northwest wind around 6 mph becoming calm in the evening.
Thursday
Mostly sunny, with a high near 77. Calm wind becoming north around 5 mph in the afternoon.
Thursday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 56. Light and variable wind.
Friday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 78. Calm wind becoming southeast 5 to 8 mph in the afternoon.
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ABOUT THIS FORECAST

 
Point Forecast:
Portsmouth IA
 41.65°N 95.53°W (Elev. 1250 ft)
Last Update:
1:05 am CDT Jun 20, 2026
Forecast Valid:
1am CDT Jun 20, 2026-6pm CDT Jun 26, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation