Dangerous Heat in the Southwest; Severe Thunderstorms and Heavy Rain in the Northeast and Mid-Atlantic

Dangerous heat will persist across the Southwest U.S. through Friday with daytime highs of 110-115°F. Heat across the southern Plains will briefly ease to near-normal by late week. Strong to severe thunderstorms may produce damaging wind, hail, a tornado or two, heavy rain and flash flooding across parts of the Mid-Atlantic and Northeast. Heavy rainfall threat continues across the Gulf Coast. Read More >

Current conditions at

Illinois Valley Regional Airport (KVYS)

Lat: 41.35°NLon: 89.15°WElev: 650ft.

Partly Cloudy

79°F

26°C

Humidity 61%
Wind Speed N 6 mph
Barometer 30.05 in
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 27 Aug 11:40 am CDT
Extended Forecast for

Lostant IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 81. North northwest wind around 5 mph, with gusts as high as 15 mph.

    High: 81 °F

    Sunny

  • Tonight

    Tonight: Patchy fog after 2am.  Otherwise, mostly clear, with a low around 60. North northwest wind around 5 mph becoming calm.

    Low: 60 °F

    Mostly Clear
    then Patchy
    Fog

  • Friday

    Friday: Patchy fog before 8am.  Otherwise, sunny, with a high near 82. Calm wind.

    High: 82 °F

    Patchy Fog
    then Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 61. Calm wind becoming south around 5 mph after midnight. Winds could gust as high as 10 mph.

    Low: 61 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 81. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 81 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 68.

    Low: 68 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 88.

    High: 88 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 73.

    Low: 73 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 89.

    High: 89 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 81. North northwest wind around 5 mph, with gusts as high as 15 mph.
Tonight
Patchy fog after 2am. Otherwise, mostly clear, with a low around 60. North northwest wind around 5 mph becoming calm.
Friday
Patchy fog before 8am. Otherwise, sunny, with a high near 82. Calm wind.
Friday Night
Partly cloudy, with a low around 61. Calm wind becoming south around 5 mph after midnight. Winds could gust as high as 10 mph.
Saturday
Partly sunny, with a high near 81. South wind 5 to 10 mph, with gusts as high as 20 mph.
Saturday Night
Mostly cloudy, with a low around 68.
Sunday
Mostly sunny, with a high near 88.
Sunday Night
Partly cloudy, with a low around 73.
Monday
Mostly sunny, with a high near 89.
Monday Night
A chance of showers after 1am. Partly cloudy, with a low around 73.
Tuesday
A chance of showers. Mostly sunny, with a high near 89.
Tuesday Night
A chance of showers. Partly cloudy, with a low around 72.
Wednesday
Sunny, with a high near 89.
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ABOUT THIS FORECAST

 
Point Forecast:
Lostant IL
 41.12°N 89.07°W
9:31 am CDT Aug 27, 2026
12pm CDT Aug 27, 2026-6pm CDT Sep 2, 2026
 
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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