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

Hazardous Weather Conditions

Current conditions at

Gary Regional Airport (KGYY)

Lat: 41.61°NLon: 87.41°WElev: 584ft.

A Few Clouds

86°F

30°C

Humidity 75%
Wind Speed NE 6 mph
Barometer 29.97 in
Dewpoint 77°F (25°C)
Visibility 9.00 mi
Heat Index97°F (36°C)
Last update 4 Sep 9:50 am CDT
Extended Forecast for

Merrillville IN

Heat Advisory September 4, 10:13am until September 4, 10:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory September 4, 10:13am until September 4, 10:00pm

    NOW until 10:00pm Fri

    Heat Advisory

  • Today

    High: 93 °F

    Slight Chance
    T-storms then
    Mostly Sunny

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 73. West southwest wind around 5 mph.

    Low: 73 °F

    Partly Cloudy
    then Chance
    T-storms

  • Saturday

    Saturday: Mostly sunny, with a high near 85. West northwest wind 5 to 10 mph becoming north in the morning. Winds could gust as high as 15 mph.

    High: 85 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 66. North northeast wind 5 to 10 mph, with gusts as high as 15 mph.

    Low: 66 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 81. East wind around 5 mph, with gusts as high as 10 mph.

    High: 81 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 62.

    Low: 62 °F

    Partly Cloudy

  • Labor Day

    Labor Day: Mostly sunny, with a high near 82.

    High: 82 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 64.

    Low: 64 °F

    Partly Cloudy

Detailed Forecast

Today
A slight chance of showers and thunderstorms between 11am and noon. Mostly sunny, with a high near 93. Heat index values as high as 103. West wind 5 to 10 mph, with gusts as high as 15 mph. Chance of precipitation is 20%.
Tonight
A 30 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 73. West southwest wind around 5 mph.
Saturday
Mostly sunny, with a high near 85. West northwest wind 5 to 10 mph becoming north in the morning. Winds could gust as high as 15 mph.
Saturday Night
Partly cloudy, with a low around 66. North northeast wind 5 to 10 mph, with gusts as high as 15 mph.
Sunday
Mostly sunny, with a high near 81. East wind around 5 mph, with gusts as high as 10 mph.
Sunday Night
Partly cloudy, with a low around 62.
Labor Day
Mostly sunny, with a high near 82.
Monday Night
Partly cloudy, with a low around 64.
Tuesday
Mostly sunny, with a high near 86.
Tuesday Night
Partly cloudy, with a low around 71.
Wednesday
A chance of showers. Mostly sunny, with a high near 90.
Wednesday Night
A chance of showers. Partly cloudy, with a low around 70.
Thursday
Partly sunny, with a high near 84.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Merrillville IN
 41.49°N 87.32°W
Last Update:
9:46 am CDT Sep 4, 2026
Forecast Valid:
10am CDT Sep 4, 2026-6pm CDT Sep 10, 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