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

Gary Regional Airport (KGYY)

Lat: 41.61°NLon: 87.41°WElev: 584ft.

Fair

63°F

17°C

Humidity 100%
Wind Speed Vrbl 6 mph
Barometer 29.93 in
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 11 Oct 10:50 pm CDT
Extended Forecast for

Merrillville IN

  • Tonight

    Tonight: Mostly clear, with a low around 58. South wind around 5 mph.

    Low: 58 °F

    Mostly Clear

  • Columbus Day

    Columbus Day: Sunny, with a high near 87. South southwest wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 87 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 69. Southwest wind around 10 mph.

    Low: 69 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 86. Southwest wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 86 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms before 1am, then showers likely and possibly a thunderstorm between 1am and 4am, then showers likely after 4am. Partly cloudy, with a low around 62. Northwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 70%.

    Low: 62 °F

    Chance
    Showers then
    Showers
    Likely

  • Wednesday

    Wednesday: A 50 percent chance of showers, mainly before 1pm. Mostly cloudy, with a high near 71.

    High: 71 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 54.

    Low: 54 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Thursday

    Thursday: Showers likely, mainly after 1pm. Mostly cloudy, with a high near 68.

    High: 68 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: Showers likely, mainly before 1am. Mostly cloudy, with a low around 50.

    Low: 50 °F

    Showers
    Likely

Detailed Forecast

Tonight
Mostly clear, with a low around 58. South wind around 5 mph.
Columbus Day
Sunny, with a high near 87. South southwest wind 5 to 15 mph, with gusts as high as 25 mph.
Monday Night
Mostly clear, with a low around 69. Southwest wind around 10 mph.
Tuesday
Sunny, with a high near 86. Southwest wind 10 to 15 mph, with gusts as high as 20 mph.
Tuesday Night
A chance of showers and thunderstorms before 1am, then showers likely and possibly a thunderstorm between 1am and 4am, then showers likely after 4am. Partly cloudy, with a low around 62. Northwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 70%.
Wednesday
A 50 percent chance of showers, mainly before 1pm. Mostly cloudy, with a high near 71.
Wednesday Night
A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 54.
Thursday
Showers likely, mainly after 1pm. Mostly cloudy, with a high near 68.
Thursday Night
Showers likely, mainly before 1am. Mostly cloudy, with a low around 50.
Friday
Partly sunny, with a high near 60. Breezy.
Friday Night
Mostly cloudy, with a low around 40.
Saturday
Mostly sunny, with a high near 54.
Saturday Night
Mostly clear, with a low around 36.
Sunday
Sunny, with a high near 61.
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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:
9:56 pm CDT Oct 11, 2026
Forecast Valid:
11pm CDT Oct 11, 2026-6pm CDT Oct 18, 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