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.

Partly Cloudy

90°F

32°C

Humidity 75%
Wind Speed S 10 G 18 mph
Barometer 29.94 in
Dewpoint 81°F (27°C)
Visibility 8.00 mi
Heat Index109°F (43°C)
Last update 29 Jun 11:50 am CDT
Extended Forecast for

Merrillville IN

Heat Advisory until July 1, 10:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory until July 1, 10:00pm

    NOW until 10:00pm Wed

    Heat Advisory

  • This Afternoon

    High: 90 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming clear, with a low around 77. South wind around 10 mph, with gusts as high as 20 mph.

    Low: 77 °F

    Decreasing
    Clouds

  • Tuesday

    Tuesday: Sunny, with a high near 94. Heat index values as high as 106. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 94 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 77. Southwest wind 5 to 15 mph, with gusts as high as 20 mph.

    Low: 77 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 94. Southwest wind 5 to 15 mph, with gusts as high as 20 mph.

    High: 94 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 76.

    Low: 76 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 93.

    High: 93 °F

    Sunny

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 74.

    Low: 74 °F

    Partly Cloudy
    then Chance
    T-storms

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 90. Heat index values as high as 101. South southwest wind 10 to 15 mph, with gusts as high as 20 mph.
Tonight
Mostly cloudy, then gradually becoming clear, with a low around 77. South wind around 10 mph, with gusts as high as 20 mph.
Tuesday
Sunny, with a high near 94. Heat index values as high as 106. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
Clear, with a low around 77. Southwest wind 5 to 15 mph, with gusts as high as 20 mph.
Wednesday
Sunny, with a high near 94. Southwest wind 5 to 15 mph, with gusts as high as 20 mph.
Wednesday Night
Mostly clear, with a low around 76.
Thursday
Sunny, with a high near 93.
Thursday Night
A chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 74.
Friday
A chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 91.
Friday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 71.
Independence Day
A chance of showers and thunderstorms. Mostly sunny, with a high near 88.
Saturday Night
A chance of showers. Partly cloudy, with a low around 69.
Sunday
A chance of showers and thunderstorms. Mostly sunny, with a high near 86.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Merrillville IN
 41.47°N 87.33°W
Last Update:
12:16 pm CDT Jun 29, 2026
Forecast Valid:
12pm CDT Jun 29, 2026-6pm CDT Jul 5, 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