Thunderstorms and Heavy Rain in the Mid-South; Heat Continues in the Southeast and Southwest

Severe thunderstorms and heavy rain are expected across portions of the mid-Mississippi Valley into the Ohio Valley and portions of Arizona. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that, when combined with oppressive dew points, little-to-no relief from the scorching daytime highs will be available. Read More >

Hazardous Weather Conditions

Current conditions at

Lewis University Airport (KLOT)

Lat: 41.6°NLon: 88.1°WElev: 669ft.

Partly Cloudy

70°F

21°C

Humidity 100%
Wind Speed SW 3 mph
Barometer 29.94 in
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Last update 19 Aug 1:15 am CDT
Extended Forecast for

3 Miles SSW Naperville IL

  • Overnight

    Overnight: Areas of fog.  Otherwise, mostly cloudy, with a low around 66. West northwest wind around 5 mph.

    Low: 66 °F

    Areas Fog

  • Wednesday

    Wednesday: A 20 percent chance of showers after 2pm.  Patchy fog before 9am.  Otherwise, partly sunny, with a high near 79. Calm wind becoming north around 5 mph in the afternoon.

    High: 79 °F

    Patchy Fog
    then Slight
    Chance
    Showers

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 62. Northeast wind around 5 mph.

    Low: 62 °F

    Mostly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 80. Calm wind becoming east northeast around 5 mph.

    High: 80 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 61. East wind around 5 mph becoming south after midnight.

    Low: 61 °F

    Mostly Clear

  • Friday

    Friday: A 30 percent chance of showers and thunderstorms after 1pm.  Mostly sunny, with a high near 78.

    High: 78 °F

    Mostly Sunny
    then Chance
    Showers

  • Friday Night

    Friday Night: A 20 percent chance of showers and thunderstorms before 1am.  Partly cloudy, with a low around 63.

    Low: 63 °F

    Slight Chance
    T-storms

  • Saturday

    Saturday: Mostly sunny, with a high near 78.

    High: 78 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 60.

    Low: 60 °F

    Mostly Clear

Detailed Forecast

Overnight
Areas of fog. Otherwise, mostly cloudy, with a low around 66. West northwest wind around 5 mph.
Wednesday
A 20 percent chance of showers after 2pm. Patchy fog before 9am. Otherwise, partly sunny, with a high near 79. Calm wind becoming north around 5 mph in the afternoon.
Wednesday Night
Mostly cloudy, with a low around 62. Northeast wind around 5 mph.
Thursday
Sunny, with a high near 80. Calm wind becoming east northeast around 5 mph.
Thursday Night
Mostly clear, with a low around 61. East wind around 5 mph becoming south after midnight.
Friday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 78.
Friday Night
A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 63.
Saturday
Mostly sunny, with a high near 78.
Saturday Night
Mostly clear, with a low around 60.
Sunday
Mostly sunny, with a high near 76.
Sunday Night
Partly cloudy, with a low around 58.
Monday
Mostly sunny, with a high near 76.
Monday Night
Partly cloudy, with a low around 60.
Tuesday
Mostly sunny, with a high near 78.
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SSW Naperville IL
 41.72°N 88.18°W
1:21 am CDT Aug 19, 2026
1am CDT Aug 19, 2026-6pm CDT Aug 25, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database