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

Dangerous Heat and Possible Flooding

Dangerous heat will persist across the Southwest U.S. through Saturday with daytime highs of 110-115°F. Extreme Heat Warnings remain in effect. Dangerous heat will build across the southern Plains again beginning this weekend. Heavy to excessive rain over the Carolinas Friday may lead to isolated areas of flash flooding. Read More >

Hazardous Weather Conditions

Current conditions at

Gary Regional Airport (KGYY)

Lat: 41.61°NLon: 87.41°WElev: 584ft.

Fair

64°F

18°C

Humidity 100%
Wind Speed S 5 mph
Barometer 30.13 in
Dewpoint 64°F (18°C)
Visibility 9.00 mi
Last update 29 Aug 5:50 am CDT
Extended Forecast for

Merrillville IN

  • Today

    Today: Partly sunny, with a high near 81. South southwest wind 5 to 10 mph.

    High: 81 °F

    Partly Sunny

  • Tonight

    Tonight: A slight chance of sprinkles before 8pm. Mostly cloudy, with a low around 67. South wind 5 to 10 mph, with gusts as high as 15 mph.

    Low: 67 °F

    Slight Chance
    Sprinkles

  • Sunday

    Sunday: Partly sunny, with a high near 86. South southwest wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 86 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 70. South southwest wind 5 to 10 mph, with gusts as high as 15 mph.

    Low: 70 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 89. South southwest wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 89 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 73.

    Low: 73 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 91.

    High: 91 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 74.

    Low: 74 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 91.

    High: 91 °F

    Sunny

Detailed Forecast

Today
Partly sunny, with a high near 81. South southwest wind 5 to 10 mph.
Tonight
A slight chance of sprinkles before 8pm. Mostly cloudy, with a low around 67. South wind 5 to 10 mph, with gusts as high as 15 mph.
Sunday
Partly sunny, with a high near 86. South southwest wind 10 to 15 mph, with gusts as high as 20 mph.
Sunday Night
Mostly cloudy, with a low around 70. South southwest wind 5 to 10 mph, with gusts as high as 15 mph.
Monday
Mostly sunny, with a high near 89. South southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Monday Night
Partly cloudy, with a low around 73.
Tuesday
Mostly sunny, with a high near 91.
Tuesday Night
Partly cloudy, with a low around 74.
Wednesday
Sunny, with a high near 91.
Wednesday Night
A chance of showers. Partly cloudy, with a low around 71.
Thursday
Mostly sunny, with a high near 87.
Thursday Night
A chance of showers. Partly cloudy, with a low around 68.
Friday
Partly sunny, with a high near 85.
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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:
4:41 am CDT Aug 29, 2026
Forecast Valid:
6am CDT Aug 29, 2026-6pm CDT Sep 4, 2026
 
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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