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

Hazardous Weather Conditions

Current conditions at

Harlan, Harlan Municipal Airport (KHNR)

Lat: 41.58°NLon: 95.34°WElev: 1230ft.

Fair

72°F

22°C

Humidity 38%
Wind Speed S 8 mph
Barometer 29.83 in
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Last update 29 Mar 7:15 pm CDT
Extended Forecast for

Portsmouth IA

  • Tonight

    Tonight: Clear, with a low around 45. Southeast wind 5 to 10 mph.

    Low: 45 °F

    Clear

  • Monday

    Monday: Increasing clouds, with a high near 84. Light and variable wind becoming south 11 to 16 mph in the morning. Winds could gust as high as 23 mph.

    High: 84 °F

    Increasing
    Clouds

  • Monday Night

    Monday Night: A chance of rain and thunderstorms. Mostly cloudy, then gradually becoming mostly clear, with a low around 51. South wind 6 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 51 °F

    Chance Rain

  • Tuesday

    Tuesday: A 30 percent chance of rain, mainly after 1pm. Mostly cloudy, with a high near 63. Windy, with a west southwest wind 17 to 25 mph becoming north in the afternoon. Winds could gust as high as 33 mph.

    High: 63 °F

    Chance Rain
    and Windy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 33. Breezy, with a north northeast wind 10 to 18 mph, with gusts as high as 29 mph.

    Low: 33 °F

    Mostly Cloudy
    and Breezy
    then Mostly
    Cloudy

  • Wednesday

    Wednesday: Rain likely, possibly mixed with snow, mainly after 1pm. Cloudy, with a high near 44. East northeast wind 11 to 15 mph, with gusts as high as 23 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 44 °F

    Chance
    Rain/Snow
    then
    Rain/Snow
    Likely

  • Wednesday Night

    Wednesday Night: Rain and snow. Low around 31. East northeast wind 13 to 15 mph, with gusts as high as 22 mph. Chance of precipitation is 80%.

    Low: 31 °F

    Rain/Snow

  • Thursday

    Thursday: Rain and snow likely before 1pm, then a chance of rain. Cloudy, with a high near 46. East northeast wind 11 to 13 mph, with gusts as high as 18 mph.

    High: 46 °F

    Rain/Snow
    Likely

  • Thursday Night

    Thursday Night: A chance of rain, mainly before 1am. Mostly cloudy, with a low around 33. East wind 8 to 10 mph, with gusts as high as 16 mph.

    Low: 33 °F

    Chance Rain

Detailed Forecast

Tonight
Clear, with a low around 45. Southeast wind 5 to 10 mph.
Monday
Increasing clouds, with a high near 84. Light and variable wind becoming south 11 to 16 mph in the morning. Winds could gust as high as 23 mph.
Monday Night
A chance of rain and thunderstorms. Mostly cloudy, then gradually becoming mostly clear, with a low around 51. South wind 6 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tuesday
A 30 percent chance of rain, mainly after 1pm. Mostly cloudy, with a high near 63. Windy, with a west southwest wind 17 to 25 mph becoming north in the afternoon. Winds could gust as high as 33 mph.
Tuesday Night
Mostly cloudy, with a low around 33. Breezy, with a north northeast wind 10 to 18 mph, with gusts as high as 29 mph.
Wednesday
Rain likely, possibly mixed with snow, mainly after 1pm. Cloudy, with a high near 44. East northeast wind 11 to 15 mph, with gusts as high as 23 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday Night
Rain and snow. Low around 31. East northeast wind 13 to 15 mph, with gusts as high as 22 mph. Chance of precipitation is 80%.
Thursday
Rain and snow likely before 1pm, then a chance of rain. Cloudy, with a high near 46. East northeast wind 11 to 13 mph, with gusts as high as 18 mph.
Thursday Night
A chance of rain, mainly before 1am. Mostly cloudy, with a low around 33. East wind 8 to 10 mph, with gusts as high as 16 mph.
Friday
A chance of rain, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 60. East southeast wind 10 to 17 mph, with gusts as high as 25 mph.
Friday Night
Rain likely and possibly a thunderstorm. Mostly cloudy, with a low around 39. Southeast wind around 17 mph becoming north northwest after midnight. Winds could gust as high as 25 mph.
Saturday
Rain likely. Mostly cloudy, with a high near 53. Breezy, with a northwest wind 18 to 23 mph, with gusts as high as 31 mph.
Saturday Night
A chance of rain. Partly cloudy, with a low around 29. Blustery, with a northwest wind 15 to 18 mph, with gusts as high as 25 mph.
Sunday
Mostly sunny, with a high near 49. Breezy, with a northwest wind 15 to 21 mph, with gusts as high as 28 mph.
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ABOUT THIS FORECAST

 
Point Forecast:
Portsmouth IA
 41.65°N 95.53°W (Elev. 1250 ft)
Last Update:
7:35 pm CDT Mar 29, 2026
Forecast Valid:
7pm CDT Mar 29, 2026-6pm CDT Apr 5, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation