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

Hazardous Weather Conditions

Current conditions at

Marion - Williamson County Regional Airport (KMWA)

Lat: 37.77°NLon: 89.01°WElev: 486ft.

Mostly Cloudy

71°F

22°C

Humidity 96%
Wind Speed Calm
Barometer 30.01 in
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Last update 16 Jun 2:35 am CDT
Extended Forecast for

2 Miles N Johnston City IL

Flood Watch June 16, 10:00am until June 17, 12:00am
Click here for hazard details and duration
Flood Watch

  • Overnight

    Overnight: A 30 percent chance of showers and thunderstorms, mainly after 4am. Mostly cloudy, with a low around 70. Calm wind.

    Low: 70 °F

    Chance
    T-storms

  • Monday

    Monday: Showers and thunderstorms likely before noon, then showers and possibly a thunderstorm between noon and 4pm, then a chance of showers and thunderstorms after 4pm. Some of the storms could produce heavy rainfall. High near 81. Calm wind becoming south southeast around 6 mph in the afternoon. Chance of precipitation is 80%.

    High: 81 °F

    Showers
    Likely then
    Heavy Rain

  • Monday Night

    Monday Night: A 50 percent chance of showers and thunderstorms, mainly before 3am. Some of the storms could produce heavy rainfall. Mostly cloudy, with a low around 70. East southeast wind around 5 mph becoming light and variable in the evening.

    Low: 70 °F

    Heavy Rain

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms. Cloudy through mid morning, then gradual clearing, with a high near 87. Southwest wind 3 to 8 mph.

    High: 87 °F

    Slight Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 73. South southwest wind 5 to 8 mph.

    Low: 73 °F

    Mostly Clear
    then Slight
    Chance
    T-storms

  • Wednesday

    Wednesday: A 40 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 89. South southwest wind 10 to 16 mph, with gusts as high as 25 mph.

    High: 89 °F

    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 70. South southwest wind 6 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 70%.

    Low: 70 °F

    Showers
    Likely

  • Juneteenth

    Juneteenth: A slight chance of thunderstorms before 7am. Mostly sunny, with a high near 86. West northwest wind around 6 mph.

    High: 86 °F

    Slight Chance
    T-storms then
    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 68. Calm wind.

    Low: 68 °F

    Mostly Clear

Detailed Forecast

Overnight
A 30 percent chance of showers and thunderstorms, mainly after 4am. Mostly cloudy, with a low around 70. Calm wind.
Monday
Showers and thunderstorms likely before noon, then showers and possibly a thunderstorm between noon and 4pm, then a chance of showers and thunderstorms after 4pm. Some of the storms could produce heavy rainfall. High near 81. Calm wind becoming south southeast around 6 mph in the afternoon. Chance of precipitation is 80%.
Monday Night
A 50 percent chance of showers and thunderstorms, mainly before 3am. Some of the storms could produce heavy rainfall. Mostly cloudy, with a low around 70. East southeast wind around 5 mph becoming light and variable in the evening.
Tuesday
A 20 percent chance of showers and thunderstorms. Cloudy through mid morning, then gradual clearing, with a high near 87. Southwest wind 3 to 8 mph.
Tuesday Night
A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 73. South southwest wind 5 to 8 mph.
Wednesday
A 40 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 89. South southwest wind 10 to 16 mph, with gusts as high as 25 mph.
Wednesday Night
Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 70. South southwest wind 6 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 70%.
Juneteenth
A slight chance of thunderstorms before 7am. Mostly sunny, with a high near 86. West northwest wind around 6 mph.
Thursday Night
Mostly clear, with a low around 68. Calm wind.
Friday
Sunny, with a high near 89. Calm wind becoming south around 6 mph in the afternoon.
Friday Night
Mostly clear, with a low around 73. South wind around 6 mph.
Saturday
Sunny, with a high near 92. South southwest wind 6 to 11 mph, with gusts as high as 18 mph.
Saturday Night
Mostly clear, with a low around 75. South wind 6 to 8 mph.
Sunday
Sunny, with a high near 92. South wind 6 to 9 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles N Johnston City IL
 37.85°N 88.94°W
Last Update:
2:01 am CDT Jun 16, 2025
Forecast Valid:
2am CDT Jun 16, 2025-6pm CDT Jun 22, 2025
 
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