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.

Overcast

39°F

4°C

Humidity 87%
Wind Speed SE 14 mph
Barometer 30.13 in
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Wind Chill31°F (-1°C)
Last update 7 Apr 5:55 pm CDT
Extended Forecast for

Portsmouth IA

  • Tonight

    Tonight: A slight chance of showers between 7pm and 1am. Patchy fog between 9pm and 10pm. Otherwise, cloudy, then gradually becoming partly cloudy, with a steady temperature around 39. Breezy, with a southeast wind 14 to 21 mph, with gusts as high as 30 mph. Chance of precipitation is 20%.

    Low: 39 °F

    Slight Chance
    Showers and
    Patchy Fog

  • Wednesday

    Wednesday: A 30 percent chance of showers, mainly after 2pm. Increasing clouds, with a high near 64. Windy, with a south wind 16 to 25 mph becoming west in the afternoon. Winds could gust as high as 34 mph.

    High: 64 °F

    Chance
    Showers and
    Windy

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers before 1am. Partly cloudy, with a low around 35. Northwest wind 5 to 9 mph becoming light in the evening.

    Low: 35 °F

    Slight Chance
    Showers

  • Thursday

    Thursday: Showers, with thunderstorms also possible after 4pm. High near 56. East wind 5 to 10 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 56 °F

    Chance
    Showers then
    Showers

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm. Low around 35. Northeast wind 7 to 9 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 35 °F

    Showers

  • Friday

    Friday: Partly sunny, with a high near 57. Northeast wind 7 to 9 mph.

    High: 57 °F

    Partly Sunny

  • Friday Night

    Friday Night: A 40 percent chance of showers, mainly after 1am. Partly cloudy, with a low around 42. East southeast wind 6 to 8 mph.

    Low: 42 °F

    Chance
    Showers

  • Saturday

    Saturday: Showers likely, mainly before 1pm. Cloudy, with a high near 66. South southeast wind 10 to 17 mph, with gusts as high as 25 mph.

    High: 66 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Cloudy, with a low around 56. South southeast wind 15 to 17 mph, with gusts as high as 26 mph.

    Low: 56 °F

    Chance
    T-storms then
    Showers
    Likely

Detailed Forecast

Tonight
A slight chance of showers between 7pm and 1am. Patchy fog between 9pm and 10pm. Otherwise, cloudy, then gradually becoming partly cloudy, with a steady temperature around 39. Breezy, with a southeast wind 14 to 21 mph, with gusts as high as 30 mph. Chance of precipitation is 20%.
Wednesday
A 30 percent chance of showers, mainly after 2pm. Increasing clouds, with a high near 64. Windy, with a south wind 16 to 25 mph becoming west in the afternoon. Winds could gust as high as 34 mph.
Wednesday Night
A 20 percent chance of showers before 1am. Partly cloudy, with a low around 35. Northwest wind 5 to 9 mph becoming light in the evening.
Thursday
Showers, with thunderstorms also possible after 4pm. High near 56. East wind 5 to 10 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday Night
Showers and possibly a thunderstorm. Low around 35. Northeast wind 7 to 9 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Friday
Partly sunny, with a high near 57. Northeast wind 7 to 9 mph.
Friday Night
A 40 percent chance of showers, mainly after 1am. Partly cloudy, with a low around 42. East southeast wind 6 to 8 mph.
Saturday
Showers likely, mainly before 1pm. Cloudy, with a high near 66. South southeast wind 10 to 17 mph, with gusts as high as 25 mph.
Saturday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Cloudy, with a low around 56. South southeast wind 15 to 17 mph, with gusts as high as 26 mph.
Sunday
Showers and possibly a thunderstorm. Cloudy, with a high near 71. Breezy, with a south wind 16 to 24 mph, with gusts as high as 34 mph.
Sunday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 54. Breezy, with a south wind 17 to 20 mph, with gusts as high as 29 mph.
Monday
A chance of showers. Mostly sunny, with a high near 75. Breezy, with a southwest wind 15 to 18 mph, with gusts as high as 26 mph.
Monday Night
A chance of showers. Mostly cloudy, with a low around 40. South southwest wind around 14 mph becoming north after midnight. Winds could gust as high as 21 mph.
Tuesday
A chance of showers. Mostly cloudy, with a high near 54. North wind 13 to 17 mph, with gusts as high as 25 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Portsmouth IA
 41.65°N 95.5°W (Elev. 1319 ft)
Last Update:
4:35 pm CDT Apr 7, 2026
Forecast Valid:
6pm CDT Apr 7, 2026-6pm CDT Apr 14, 2026
 
Forecast Discussion
 
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Additional Resources

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National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation