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Isolated Severe Storms in the Midwest; Fire Weather Concerns in the Northern Plains; Record Heat in the West

Isolated severe storms are possible across parts of the Florida Peninsula and the Great Lakes to Lower Missouri Valley and south-central Plains late this afternoon and early evening. Elevated to critical fire weather concerns continue over much of the northern Great Plains. Above average temperatures persist across portions of the West today. Read More >

Hazardous Weather Conditions

Current conditions at

Southern Illinois Airport (KMDH)

Lat: 37.78°NLon: 89.25°WElev: 400ft.

Fair

76°F

24°C

Humidity 36%
Wind Speed SW 9 mph
Barometer 29.99 in (1015.5 mb)
Dewpoint 47°F (8°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 12 May 6:52 pm CDT
Extended Forecast for

3 Miles NW Saint Johns IL

  • Tonight

    Tonight: Partly cloudy, with a low around 59. South southwest wind 7 to 9 mph becoming west after midnight. Winds could gust as high as 18 mph.

    Low: 59 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 74. North northwest wind 7 to 16 mph, with gusts as high as 23 mph.

    High: 74 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 48. North wind 5 to 8 mph becoming calm in the evening.

    Low: 48 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 75. Calm wind.

    High: 75 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 55. Southeast wind 5 to 9 mph.

    Low: 55 °F

    Partly Cloudy

  • Friday

    Friday: A 40 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 85. South wind 11 to 15 mph, with gusts as high as 23 mph.

    High: 85 °F

    Chance
    T-storms

  • Friday Night

    Friday Night: Mostly clear, with a low around 68. South wind around 10 mph, with gusts as high as 20 mph.

    Low: 68 °F

    Mostly Clear

  • Saturday

    Saturday: A chance of showers and thunderstorms. Mostly sunny, with a high near 88. South southwest wind around 9 mph.

    High: 88 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: A slight chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 67. South wind around 7 mph.

    Low: 67 °F

    Slight Chance
    T-storms

Detailed Forecast

Tonight
Partly cloudy, with a low around 59. South southwest wind 7 to 9 mph becoming west after midnight. Winds could gust as high as 18 mph.
Wednesday
Sunny, with a high near 74. North northwest wind 7 to 16 mph, with gusts as high as 23 mph.
Wednesday Night
Clear, with a low around 48. North wind 5 to 8 mph becoming calm in the evening.
Thursday
Sunny, with a high near 75. Calm wind.
Thursday Night
Partly cloudy, with a low around 55. Southeast wind 5 to 9 mph.
Friday
A 40 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 85. South wind 11 to 15 mph, with gusts as high as 23 mph.
Friday Night
Mostly clear, with a low around 68. South wind around 10 mph, with gusts as high as 20 mph.
Saturday
A chance of showers and thunderstorms. Mostly sunny, with a high near 88. South southwest wind around 9 mph.
Saturday Night
A slight chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 67. South wind around 7 mph.
Sunday
Mostly sunny, with a high near 88. South wind 8 to 16 mph, with gusts as high as 24 mph.
Sunday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 71. South wind around 14 mph, with gusts as high as 23 mph.
Monday
A chance of showers and thunderstorms. Mostly sunny, with a high near 90. South southwest wind 13 to 17 mph, with gusts as high as 24 mph.
Monday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 69. South wind 7 to 11 mph, with gusts as high as 20 mph.
Tuesday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 85. Southwest wind 8 to 10 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NW Saint Johns IL
 38.06°N 89.27°W
Last Update:
5:35 pm CDT May 12, 2026
Forecast Valid:
7pm CDT May 12, 2026-6pm CDT May 19, 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