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

3°F

-16°C

Humidity 85%
Wind Speed N 9 mph
Barometer 30.67 in
Dewpoint 0°F (-18°C)
Visibility 10.00 mi
Wind Chill-11°F (-24°C)
Last update 23 Feb 1:15 am CST
Extended Forecast for

Portsmouth IA

  • Overnight

    Overnight: Mostly clear, with a low around -5. North wind around 6 mph becoming calm.

    Low: -5 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 23. Calm wind becoming south 5 to 7 mph in the afternoon.

    High: 23 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a temperature falling to near 15 by 8pm, then rising to around 22 during the remainder of the night. South wind 6 to 13 mph, with gusts as high as 22 mph.

    Low: 15 °F⇑

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 45. South wind around 10 mph becoming northwest in the afternoon. Winds could gust as high as 18 mph.

    High: 45 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 19. Northwest wind 5 to 8 mph becoming calm after midnight.

    Low: 19 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A chance of snow after noon, mixing with rain after 3pm. Partly sunny, with a high near 38. Calm wind becoming south southeast 5 to 9 mph in the morning. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

    High: 38 °F

    Partly Sunny
    then Chance
    Rain/Snow

  • Wednesday Night

    Wednesday Night: Rain and snow likely before midnight, then a chance of snow. Mostly cloudy, with a low around 21. East southeast wind 6 to 8 mph becoming northwest after midnight. Chance of precipitation is 60%.

    Low: 21 °F

    Rain/Snow
    Likely then
    Chance Snow

  • Thursday

    Thursday: Sunny, with a high near 43. West northwest wind 6 to 9 mph.

    High: 43 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 29. West wind 6 to 9 mph becoming south southwest in the evening.

    Low: 29 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly clear, with a low around -5. North wind around 6 mph becoming calm.
Monday
Sunny, with a high near 23. Calm wind becoming south 5 to 7 mph in the afternoon.
Monday Night
Partly cloudy, with a temperature falling to near 15 by 8pm, then rising to around 22 during the remainder of the night. South wind 6 to 13 mph, with gusts as high as 22 mph.
Tuesday
Mostly cloudy, with a high near 45. South wind around 10 mph becoming northwest in the afternoon. Winds could gust as high as 18 mph.
Tuesday Night
Partly cloudy, with a low around 19. Northwest wind 5 to 8 mph becoming calm after midnight.
Wednesday
A chance of snow after noon, mixing with rain after 3pm. Partly sunny, with a high near 38. Calm wind becoming south southeast 5 to 9 mph in the morning. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday Night
Rain and snow likely before midnight, then a chance of snow. Mostly cloudy, with a low around 21. East southeast wind 6 to 8 mph becoming northwest after midnight. Chance of precipitation is 60%.
Thursday
Sunny, with a high near 43. West northwest wind 6 to 9 mph.
Thursday Night
Mostly clear, with a low around 29. West wind 6 to 9 mph becoming south southwest in the evening.
Friday
Sunny, with a high near 57. South southwest wind 9 to 14 mph becoming west northwest in the afternoon.
Friday Night
Partly cloudy, with a low around 25. Northwest wind around 11 mph becoming northeast in the evening. Winds could gust as high as 20 mph.
Saturday
Mostly sunny, with a high near 40. Northeast wind 13 to 15 mph, with gusts as high as 22 mph.
Saturday Night
A slight chance of snow. Mostly cloudy, with a low around 16. North northeast wind around 11 mph, with gusts as high as 17 mph.
Sunday
A chance of snow. Partly sunny, with a high near 34. East northeast wind 10 to 13 mph, with gusts as high as 18 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Portsmouth IA
 41.65°N 95.53°W (Elev. 1250 ft)
Last Update:
12:35 am CST Feb 23, 2026
Forecast Valid:
1am CST Feb 23, 2026-6pm CST Mar 1, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation