Thunderstorms and Heavy Rains in the Appalachians

Multiple rounds of moderate to locally heavy rain will impact portions of the Appalachians and Mid-Atlantic, which may lead to flash flooding concerns. Thunderstorms with isolated severe wind gusts will be possible this afternoon from parts of the Southeast into the southern and central Appalachians. A multi-day heavy rain will pose a flash flood threat in New Mexico beginning Tuesday. Read More >

Current conditions at

Gary Regional Airport (KGYY)

Lat: 41.61°NLon: 87.41°WElev: 584ft.

Fair

66°F

19°C

Humidity 78%
Wind Speed NE 14 mph
Barometer 30.12 in
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 21 Sep 12:50 pm CDT
Extended Forecast for

Merrillville IN

  • This Afternoon

    This Afternoon: A slight chance of showers between 2pm and 4pm.  Cloudy, with a high near 64. East northeast wind around 10 mph, with gusts as high as 20 mph.  Chance of precipitation is 20%.

    High: 64 °F

    Slight Chance
    Showers

  • Tonight

    Tonight: Mostly cloudy, with a low around 52. Northeast wind around 10 mph, with gusts as high as 15 mph.

    Low: 52 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 63. Northeast wind around 10 mph, with gusts as high as 15 mph.

    High: 63 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 53. Northeast wind 5 to 10 mph, with gusts as high as 15 mph.

    Low: 53 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 65. Northeast wind around 10 mph, with gusts as high as 15 mph.

    High: 65 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 52.

    Low: 52 °F

    Mostly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 67.

    High: 67 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 51.

    Low: 51 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 66.

    High: 66 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
A slight chance of showers between 2pm and 4pm. Cloudy, with a high near 64. East northeast wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
Tonight
Mostly cloudy, with a low around 52. Northeast wind around 10 mph, with gusts as high as 15 mph.
Tuesday
Mostly cloudy, with a high near 63. Northeast wind around 10 mph, with gusts as high as 15 mph.
Tuesday Night
Mostly cloudy, with a low around 53. Northeast wind 5 to 10 mph, with gusts as high as 15 mph.
Wednesday
Mostly cloudy, with a high near 65. Northeast wind around 10 mph, with gusts as high as 15 mph.
Wednesday Night
Mostly cloudy, with a low around 52.
Thursday
Partly sunny, with a high near 67.
Thursday Night
Mostly cloudy, with a low around 51.
Friday
Mostly sunny, with a high near 66.
Friday Night
Partly cloudy, with a low around 49.
Saturday
Partly sunny, with a high near 66.
Saturday Night
Mostly cloudy, with a low around 51.
Sunday
Partly sunny, with a high near 70.
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ABOUT THIS FORECAST

 
Point Forecast:
Merrillville IN
 41.47°N 87.33°W
1:21 pm CDT Sep 21, 2026
1pm CDT Sep 21, 2026-6pm CDT Sep 27, 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