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

Marion - Williamson County Regional Airport (KMWA)

Lat: 37.77°NLon: 89.01°WElev: 486ft.

Overcast

27°F

-3°C

Humidity 80%
Wind Speed N 13 mph
Barometer 30.36 in
Dewpoint 21°F (-6°C)
Visibility 7.00 mi
Wind Chill16°F (-9°C)
Last update 4 Dec 7:45 am CST
Extended Forecast for

Pittsburg IL

  • Today

    Today: Partly sunny, with a high near 31. North wind 5 to 10 mph.

    High: 31 °F

    Partly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 19. Calm wind.

    Low: 19 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 41. Calm wind becoming south southwest around 6 mph in the afternoon.

    High: 41 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 27. South wind around 5 mph becoming calm after midnight.

    Low: 27 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 44. Calm wind becoming west around 5 mph.

    High: 44 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A slight chance of rain showers between midnight and 3am, then a slight chance of freezing rain after 3am. Mostly cloudy, with a low around 29. Calm wind becoming northeast around 5 mph after midnight. Chance of precipitation is 20%.

    Low: 29 °F

    Mostly Cloudy
    then Slight
    Chance
    Rain/Freezing
    Rain

  • Sunday

    Sunday: A 20 percent chance of showers before noon. Mostly cloudy, with a high near 39. North wind 6 to 9 mph.

    High: 39 °F

    Slight Chance
    Showers then
    Mostly Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 22. North wind 6 to 8 mph.

    Low: 22 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 36. North wind around 6 mph becoming light and variable in the afternoon.

    High: 36 °F

    Mostly Sunny

Detailed Forecast

Today
Partly sunny, with a high near 31. North wind 5 to 10 mph.
Tonight
Partly cloudy, with a low around 19. Calm wind.
Friday
Sunny, with a high near 41. Calm wind becoming south southwest around 6 mph in the afternoon.
Friday Night
Partly cloudy, with a low around 27. South wind around 5 mph becoming calm after midnight.
Saturday
Mostly sunny, with a high near 44. Calm wind becoming west around 5 mph.
Saturday Night
A slight chance of rain showers between midnight and 3am, then a slight chance of freezing rain after 3am. Mostly cloudy, with a low around 29. Calm wind becoming northeast around 5 mph after midnight. Chance of precipitation is 20%.
Sunday
A 20 percent chance of showers before noon. Mostly cloudy, with a high near 39. North wind 6 to 9 mph.
Sunday Night
Mostly cloudy, with a low around 22. North wind 6 to 8 mph.
Monday
Mostly sunny, with a high near 36. North wind around 6 mph becoming light and variable in the afternoon.
Monday Night
Partly cloudy, with a low around 24. Calm wind becoming south southwest 5 to 7 mph after midnight.
Tuesday
Mostly sunny, with a high near 45. Southwest wind 8 to 13 mph, with gusts as high as 18 mph.
Tuesday Night
Mostly cloudy, with a low around 33. South southwest wind 8 to 11 mph, with gusts as high as 18 mph.
Wednesday
A chance of showers. Mostly cloudy, with a high near 50. South southwest wind 10 to 14 mph, with gusts as high as 21 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Pittsburg IL
 37.78°N 88.86°W
Last Update:
6:41 am CST Dec 4, 2025
Forecast Valid:
8am CST Dec 4, 2025-6pm CST Dec 10, 2025
 
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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