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

79°F

26°C

Humidity 100%
Wind Speed SE 3 mph
Barometer 29.93 in
Dewpoint 79°F (26°C)
Visibility 10.00 mi
Heat Index84°F (29°C)
Last update 29 Jun 1:55 am CDT
Extended Forecast for

Merrillville IN

Heat Advisory June 29, 12:00pm until July 1, 10:00pm
Click here for hazard details and duration
Heat Advisory

  • Overnight

    Overnight: Partly cloudy, with a low around 74. South southeast wind around 10 mph, with gusts as high as 15 mph.

    Low: 74 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 92. Heat index values as high as 103. South wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 92 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, then gradually becoming clear, with a low around 76. South southwest wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 76 °F

    Decreasing
    Clouds

  • Tuesday

    Tuesday: Sunny, with a high near 93. Heat index values as high as 105. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 93 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 75. South southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 75 °F

    Clear

  • Wednesday

    Wednesday: Sunny and hot, with a high near 95.

    High: 95 °F

    Hot

  • Wednesday Night

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

    Low: 76 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 94.

    High: 94 °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

Overnight
Partly cloudy, with a low around 74. South southeast wind around 10 mph, with gusts as high as 15 mph.
Monday
Mostly sunny, with a high near 92. Heat index values as high as 103. South wind 10 to 15 mph, with gusts as high as 25 mph.
Monday Night
Mostly cloudy, then gradually becoming clear, with a low around 76. South southwest wind 10 to 15 mph, with gusts as high as 20 mph.
Tuesday
Sunny, with a high near 93. Heat index values as high as 105. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
Clear, with a low around 75. South southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Wednesday
Sunny and hot, with a high near 95.
Wednesday Night
Mostly clear, with a low around 76.
Thursday
Sunny, with a high near 94.
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
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Merrillville IN
 41.47°N 87.33°W
Last Update:
2:05 am CDT Jun 29, 2026
Forecast Valid:
2am CDT Jun 29, 2026-6pm CDT Jul 5, 2026
 
Forecast Discussion
 
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Additional Resources

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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