Cold Temperatures for the Eastern U.S.; Lake Effect Snow in the Great Lakes; Heavy Rain in the Pacific Northwest

Cold temperatures will continue across much of the eastern U.S. into today. Heavy lake effect snow continues into today east of Lakes Erie and Ontario. Two Pacific cold fronts will cross the Pacific Northwest early this week followed by another atmospheric river. Heavy rain and gusty winds are expected through midweek, with the potential for renewed urban and river flooding. Read More >

Hazardous Weather Conditions

Current conditions at

Gary Regional Airport (KGYY)

Lat: 41.61°NLon: 87.41°WElev: 584ft.

Fair

21°F

-6°C

Humidity 68%
Wind Speed Vrbl 6 G 14 mph
Barometer 30.11 in
Dewpoint 12°F (-11°C)
Visibility 10.00 mi
Wind Chill13°F (-11°C)
Last update 15 Dec 4:52 pm CST
Extended Forecast for

Merrillville IN

  • Tonight

    Tonight: Mostly clear, with a low around 15. South southwest wind around 5 mph, with gusts as high as 15 mph.

    Low: 15 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 35. South southwest wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 35 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a steady temperature around 33. South southwest wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 33 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 38. West wind around 5 mph becoming south in the afternoon. Winds could gust as high as 15 mph.

    High: 38 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A 30 percent chance of rain after midnight.  Mostly cloudy, with a low around 31. South wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 31 °F

    Mostly Cloudy
    then Chance
    Rain

  • Thursday

    Thursday: Rain before noon, then rain likely, possibly mixed with snow.  High near 47. Chance of precipitation is 90%.

    High: 47 °F

    Rain then
    Rain/Snow
    Likely

  • Thursday Night

    Thursday Night: A slight chance of rain and snow before midnight.  Mostly cloudy, with a low around 15. Chance of precipitation is 20%.

    Low: 15 °F

    Slight Chance
    Rain/Snow
    then Mostly
    Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 27.

    High: 27 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 21.

    Low: 21 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 15. South southwest wind around 5 mph, with gusts as high as 15 mph.
Tuesday
Sunny, with a high near 35. South southwest wind 5 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
Mostly cloudy, with a steady temperature around 33. South southwest wind 10 to 15 mph, with gusts as high as 20 mph.
Wednesday
Mostly sunny, with a high near 38. West wind around 5 mph becoming south in the afternoon. Winds could gust as high as 15 mph.
Wednesday Night
A 30 percent chance of rain after midnight. Mostly cloudy, with a low around 31. South wind 10 to 15 mph, with gusts as high as 25 mph.
Thursday
Rain before noon, then rain likely, possibly mixed with snow. High near 47. Chance of precipitation is 90%.
Thursday Night
A slight chance of rain and snow before midnight. Mostly cloudy, with a low around 15. Chance of precipitation is 20%.
Friday
Mostly sunny, with a high near 27.
Friday Night
Mostly cloudy, with a low around 21.
Saturday
Partly sunny, with a high near 43.
Saturday Night
Mostly cloudy, with a low around 26.
Sunday
Mostly sunny, with a high near 35.
Sunday Night
Mostly cloudy, with a low around 26.
Monday
Partly sunny, with a high near 39.
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ABOUT THIS FORECAST

 
Point Forecast:
Merrillville IN
 41.47°N 87.33°W
3:50 pm CST Dec 15, 2025
5pm CST Dec 15, 2025-6pm CST Dec 22, 2025
 
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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