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

Hazardous Weather Conditions

Current conditions at

Plymouth (KC65)

Lat: 41.37°NLon: 86.3°WElev: 801ft.

Fair

86°F

30°C

Humidity 79%
Wind Speed S 3 mph
Barometer 29.98 in
Dewpoint 79°F (26°C)
Visibility 10.00 mi
Heat Index99°F (37°C)
Last update 31 Aug 7:15 pm EDT
Extended Forecast for

Koontz Lake IN

Heat Advisory September 1, 01:00pm until September 2, 07:00pm
Click here for hazard details and duration
Heat Advisory

  • Tonight

    Tonight: A 40 percent chance of showers and thunderstorms, mainly before 8pm. Partly cloudy, with a low around 73. South wind 5 to 10 mph.

    Low: 73 °F

    Chance
    T-storms then
    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny and hot, with a high near 91. Heat index values as high as 102. Southwest wind around 5 mph.

    High: 91 °F

    Hot

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 74. Southwest wind around 5 mph.

    Low: 74 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny and hot, with a high near 93. Heat index values as high as 103. Southwest wind 5 to 10 mph.

    High: 93 °F

    Hot

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 74. Southwest wind around 5 mph.

    Low: 74 °F

    Mostly Clear

  • Thursday

    Thursday: A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 89.

    High: 89 °F

    Slight Chance
    T-storms

  • Thursday Night

    Thursday Night: A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 70.

    Low: 70 °F

    Partly Cloudy
    then Chance
    T-storms

  • Friday

    Friday: A 30 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 86.

    High: 86 °F

    Chance
    T-storms

  • Friday Night

    Friday Night: A 40 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 68.

    Low: 68 °F

    Chance
    T-storms

Detailed Forecast

Tonight
A 40 percent chance of showers and thunderstorms, mainly before 8pm. Partly cloudy, with a low around 73. South wind 5 to 10 mph.
Tuesday
Mostly sunny and hot, with a high near 91. Heat index values as high as 102. Southwest wind around 5 mph.
Tuesday Night
Partly cloudy, with a low around 74. Southwest wind around 5 mph.
Wednesday
Sunny and hot, with a high near 93. Heat index values as high as 103. Southwest wind 5 to 10 mph.
Wednesday Night
Mostly clear, with a low around 74. Southwest wind around 5 mph.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 89.
Thursday Night
A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 70.
Friday
A 30 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 86.
Friday Night
A 40 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 68.
Saturday
A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 84. Chance of precipitation is 30%.
Saturday Night
A 20 percent chance of showers. Partly cloudy, with a low around 63.
Sunday
A 20 percent chance of showers. Mostly sunny, with a high near 81.
Sunday Night
Partly cloudy, with a low around 61.
Labor Day
Mostly sunny, with a high near 82.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Koontz Lake IN
 41.41°N 86.48°W (Elev. 696 ft)
Last Update:
4:45 pm CDT Aug 31, 2026
Forecast Valid:
6pm CDT Aug 31, 2026-6pm CDT Sep 7, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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