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

Hazardous Weather Conditions

Current conditions at

Spencer Municipal Airport (KSPW)

Lat: 43.17°NLon: 95.21°WElev: 1332ft.

Fair

77°F

25°C

Humidity 62%
Wind Speed S 12 mph
Barometer 30.06 in (1017.7 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 20 Aug 11:53 am CDT
Extended Forecast for

Marathon IA

  • This Afternoon

    This Afternoon: Sunny, with a high near 82. South wind around 10 mph.

    High: 82 °F

    Sunny

  • Tonight

    Tonight: A slight chance of showers and thunderstorms between 8pm and midnight. Mostly clear, with a low around 63. South southwest wind around 5 mph. Chance of precipitation is 20%.

    Low: 63 °F

    Slight Chance
    T-storms then
    Mostly Clear

  • Friday

    Friday: Patchy fog before 8am. Otherwise, sunny, with a high near 84. West wind around 5 mph becoming north in the afternoon.

    High: 84 °F

    Patchy Fog
    then Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 60. Calm wind.

    Low: 60 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 79. North wind around 5 mph.

    High: 79 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 55. North northeast wind around 5 mph becoming calm.

    Low: 55 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 78.

    High: 78 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 59.

    Low: 59 °F

    Partly Cloudy
    then Chance
    Showers

  • Monday

    Monday: A 30 percent chance of showers before 1pm. Partly sunny, with a high near 78.

    High: 78 °F

    Chance
    Showers

Detailed Forecast

This Afternoon
Sunny, with a high near 82. South wind around 10 mph.
Tonight
A slight chance of showers and thunderstorms between 8pm and midnight. Mostly clear, with a low around 63. South southwest wind around 5 mph. Chance of precipitation is 20%.
Friday
Patchy fog before 8am. Otherwise, sunny, with a high near 84. West wind around 5 mph becoming north in the afternoon.
Friday Night
Mostly clear, with a low around 60. Calm wind.
Saturday
Sunny, with a high near 79. North wind around 5 mph.
Saturday Night
Partly cloudy, with a low around 55. North northeast wind around 5 mph becoming calm.
Sunday
Mostly sunny, with a high near 78.
Sunday Night
A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 59.
Monday
A 30 percent chance of showers before 1pm. Partly sunny, with a high near 78.
Monday Night
Partly cloudy, with a low around 61.
Tuesday
Mostly sunny, with a high near 83.
Tuesday Night
Partly cloudy, with a low around 61.
Wednesday
Mostly sunny, with a high near 81.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Marathon IA
 42.85°N 94.97°W (Elev. 1375 ft)
Last Update:
11:38 am CDT Aug 20, 2026
Forecast Valid:
12pm CDT Aug 20, 2026-6pm CDT Aug 26, 2026
 
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