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.

Overcast

79°F

26°C

Humidity 94%
Wind Speed Vrbl 5 mph
Barometer 29.92 in
Dewpoint 77°F (25°C)
Visibility 10.00 mi
Heat Index83°F (28°C)
Last update 16 Jul 1:35 am CDT
Extended Forecast for

Merrillville IN

  • Overnight

    Overnight: A 20 percent chance of showers. Mostly cloudy, with a low around 71. South wind around 5 mph.

    Low: 71 °F

    Slight Chance
    Showers

  • Wednesday

    Wednesday: A slight chance of showers and thunderstorms before 10am, then a slight chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 90. Heat index values as high as 98. Southwest wind 5 to 10 mph, with gusts as high as 15 mph. Chance of precipitation is 20%.

    High: 90 °F

    Slight Chance
    T-storms

  • Wednesday Night

    Wednesday Night: Showers and thunderstorms likely before 1am, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 70. Southwest wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 70 °F

    T-storms
    Likely

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 77. North wind around 10 mph, with gusts as high as 20 mph.

    High: 77 °F

    Chance
    T-storms

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 62. North wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 62 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 79.

    High: 79 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 64.

    Low: 64 °F

    Partly Cloudy
    then Chance
    T-storms

  • Saturday

    Saturday: Showers and thunderstorms likely. Mostly cloudy, with a high near 85.

    High: 85 °F

    T-storms
    Likely

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 69.

    Low: 69 °F

    Chance
    T-storms

Detailed Forecast

Overnight
A 20 percent chance of showers. Mostly cloudy, with a low around 71. South wind around 5 mph.
Wednesday
A slight chance of showers and thunderstorms before 10am, then a slight chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 90. Heat index values as high as 98. Southwest wind 5 to 10 mph, with gusts as high as 15 mph. Chance of precipitation is 20%.
Wednesday Night
Showers and thunderstorms likely before 1am, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 70. Southwest wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Thursday
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 77. North wind around 10 mph, with gusts as high as 20 mph.
Thursday Night
Mostly cloudy, with a low around 62. North wind 5 to 10 mph, with gusts as high as 20 mph.
Friday
Mostly sunny, with a high near 79.
Friday Night
A 30 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 64.
Saturday
Showers and thunderstorms likely. Mostly cloudy, with a high near 85.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 69.
Sunday
A chance of showers and thunderstorms. Partly sunny, with a high near 81.
Sunday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 66.
Monday
A chance of showers and thunderstorms. Partly sunny, with a high near 84.
Monday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 68.
Tuesday
Mostly sunny, with a high near 87.
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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:
1:11 am CDT Jul 16, 2025
Forecast Valid:
1am CDT Jul 16, 2025-6pm CDT Jul 22, 2025
 
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