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

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

A Few Clouds

82°F

28°C

Humidity 47%
Wind Speed E 3 mph
Barometer 30.11 in (1019.2 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 28 Aug 4:54 pm CDT
Extended Forecast for

Stonington IL

  • Tonight

    Tonight: Mostly clear, with a low around 62. Calm wind becoming southeast around 5 mph.

    Low: 62 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 87. South wind 3 to 8 mph.

    High: 87 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 69. South wind 6 to 8 mph.

    Low: 69 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny through mid morning, then becoming sunny, with a high near 92. South southwest wind 8 to 14 mph, with gusts as high as 20 mph.

    High: 92 °F

    Becoming
    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 73. South wind around 9 mph, with gusts as high as 15 mph.

    Low: 73 °F

    Mostly Clear

  • Monday

    Monday: Sunny and hot, with a high near 97. South southwest wind 9 to 13 mph, with gusts as high as 18 mph.

    High: 97 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 75. South wind 7 to 9 mph, with gusts as high as 15 mph.

    Low: 75 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 98.

    High: 98 °F

    Hot

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 77.

    Low: 77 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 62. Calm wind becoming southeast around 5 mph.
Saturday
Mostly sunny, with a high near 87. South wind 3 to 8 mph.
Saturday Night
Partly cloudy, with a low around 69. South wind 6 to 8 mph.
Sunday
Partly sunny through mid morning, then becoming sunny, with a high near 92. South southwest wind 8 to 14 mph, with gusts as high as 20 mph.
Sunday Night
Mostly clear, with a low around 73. South wind around 9 mph, with gusts as high as 15 mph.
Monday
Sunny and hot, with a high near 97. South southwest wind 9 to 13 mph, with gusts as high as 18 mph.
Monday Night
Mostly clear, with a low around 75. South wind 7 to 9 mph, with gusts as high as 15 mph.
Tuesday
Sunny and hot, with a high near 98.
Tuesday Night
Partly cloudy, with a low around 77.
Wednesday
Sunny and hot, with a high near 98.
Wednesday Night
Mostly clear, with a low around 75.
Thursday
Mostly sunny and hot, with a high near 97.
Thursday Night
Mostly clear, with a low around 75.
Friday
Sunny and hot, with a high near 96.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Stonington IL
 39.63°N 89.18°W (Elev. 620 ft)
Last Update:
5:01 pm CDT Aug 28, 2026
Forecast Valid:
5pm CDT Aug 28, 2026-6pm CDT Sep 4, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation