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

Dangerous Heat and Heavy Rainfall into the Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend. Heat Advisories remain in effect. Heavy to excessive rainfall occurring at times through the weekend could bring areas of flooding to parts of the northern Rockies, upper Midwest, central Great Lakes, and southern New England. Read More >

Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Mostly Cloudy

83°F

28°C

Humidity 57%
Wind Speed Calm
Barometer 29.92 in (1012.4 mb)
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 20 Sep 1:54 pm CDT
Extended Forecast for

Nokomis IL

  • This Afternoon

    This Afternoon: A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 88. Northwest wind around 7 mph.

    High: 88 °F

    Slight Chance
    T-storms

  • Tonight

    Tonight: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 63. North wind 5 to 7 mph.

    Low: 63 °F

    Chance
    T-storms

  • Monday

    Monday: A chance of showers and thunderstorms before 8am, then a slight chance of showers between 8am and 10am. Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 69. Northeast wind 6 to 8 mph. Chance of precipitation is 30%.

    High: 69 °F

    Chance
    Showers and
    Patchy Fog
    then Mostly
    Cloudy

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 57. Northeast wind 6 to 8 mph.

    Low: 57 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 70. Northeast wind 8 to 10 mph.

    High: 70 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 51.

    Low: 51 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 72.

    High: 72 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 51.

    Low: 51 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 74.

    High: 74 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 88. Northwest wind around 7 mph.
Tonight
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 63. North wind 5 to 7 mph.
Monday
A chance of showers and thunderstorms before 8am, then a slight chance of showers between 8am and 10am. Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 69. Northeast wind 6 to 8 mph. Chance of precipitation is 30%.
Monday Night
Mostly cloudy, with a low around 57. Northeast wind 6 to 8 mph.
Tuesday
Partly sunny, with a high near 70. Northeast wind 8 to 10 mph.
Tuesday Night
Partly cloudy, with a low around 51.
Wednesday
Mostly sunny, with a high near 72.
Wednesday Night
Partly cloudy, with a low around 51.
Thursday
Mostly sunny, with a high near 74.
Thursday Night
Partly cloudy, with a low around 53.
Friday
Partly sunny, with a high near 75.
Friday Night
Partly cloudy, with a low around 53.
Saturday
Mostly cloudy, with a high near 77.
Saturday Night
Mostly cloudy, with a low around 55.
Sunday
Partly sunny, with a high near 82.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Nokomis IL
 39.3°N 89.29°W (Elev. 669 ft)
Last Update:
2:36 pm CDT Sep 20, 2026
Forecast Valid:
3pm CDT Sep 20, 2026-6pm CDT Sep 27, 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