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

Dangerous Heat and Possible Flooding

Dangerous heat will persist across the Southwest U.S. through Saturday with daytime highs of 110-115°F. Extreme Heat Warnings remain in effect. Dangerous heat will build across the southern Plains again beginning this weekend. Heavy to excessive rain over the Carolinas Friday may lead to isolated areas of flash flooding. Read More >

Current conditions at

Salem, Salem-Leckrone Airport (KSLO)

Lat: 38.64°NLon: 88.96°WElev: 574ft.

Partly Cloudy

87°F

31°C

Humidity 43%
Wind Speed NA
Barometer 30.10 in
Dewpoint 62°F (17°C)
Visibility 10.00 mi
Heat Index87°F (31°C)
Last update 28 Aug 4:35 pm CDT
Extended Forecast for

Greenville IL

  • Tonight

    Tonight: Mostly clear, with a low around 63. Calm wind.

    Low: 63 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 87. Calm wind becoming south around 6 mph in the afternoon.

    High: 87 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 68. Light south wind.

    Low: 68 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 92. Light south wind increasing to 6 to 11 mph in the morning.

    High: 92 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 73. South wind around 6 mph.

    Low: 73 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 96.

    High: 96 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 75.

    Low: 75 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 97.

    High: 97 °F

    Hot

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 77.

    Low: 77 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 63. Calm wind.
Saturday
Mostly sunny, with a high near 87. Calm wind becoming south around 6 mph in the afternoon.
Saturday Night
Partly cloudy, with a low around 68. Light south wind.
Sunday
Sunny, with a high near 92. Light south wind increasing to 6 to 11 mph in the morning.
Sunday Night
Mostly clear, with a low around 73. South wind around 6 mph.
Monday
Sunny, with a high near 96.
Monday Night
Mostly clear, with a low around 75.
Tuesday
Sunny and hot, with a high near 97.
Tuesday Night
Mostly clear, with a low around 77.
Wednesday
Sunny, with a high near 96.
Wednesday Night
Mostly clear, with a low around 77.
Thursday
Sunny and hot, with a high near 97.
Thursday Night
Mostly clear, with a low around 76.
Friday
Sunny, with a high near 95.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Greenville IL
 38.88°N 89.39°W (Elev. 538 ft)
Last Update:
1:25 pm CDT Aug 28, 2026
Forecast Valid:
4pm CDT Aug 28, 2026-6pm CDT Sep 4, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

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Chance of Precipitation