Thunderstorms and Heavy Rain in the Mid-South; Heat Continues in the Southeast and Southwest

Severe thunderstorms and heavy rain are expected across portions of the mid-Mississippi Valley into the Ohio Valley and portions of Arizona. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that, when combined with oppressive dew points, little-to-no relief from the scorching daytime highs will be available. Read More >

Current conditions at

Gary Regional Airport (KGYY)

Lat: 41.61°NLon: 87.41°WElev: 584ft.

Fog/Mist

68°F

20°C

Humidity 100%
Wind Speed Calm
Barometer 29.92 in
Dewpoint 68°F (20°C)
Visibility 5.00 mi
Last update 19 Aug 5:50 am CDT
Extended Forecast for

Merrillville IN

  • Today

    Today: A slight chance of showers between 1pm and 3pm.  Partly sunny, with a high near 78. Light and variable wind becoming north northeast 5 to 10 mph in the afternoon.  Chance of precipitation is 20%.

    High: 78 °F

    Partly Sunny
    then Slight
    Chance
    Showers

  • Tonight

    Tonight: Mostly cloudy, with a low around 61. North northeast wind around 5 mph.

    Low: 61 °F

    Mostly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 79. North northeast wind around 5 mph becoming calm  in the afternoon.

    High: 79 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 60. Northeast wind around 5 mph becoming calm.

    Low: 60 °F

    Mostly Clear

  • Friday

    Friday: A 30 percent chance of showers and thunderstorms after 1pm.  Mostly sunny, with a high near 79. Calm wind becoming south southwest around 5 mph in the morning. Winds could gust as high as 10 mph.

    High: 79 °F

    Mostly Sunny
    then Chance
    Showers

  • Friday Night

    Friday Night: A chance of showers and thunderstorms before 1am, then a slight chance of showers.  Partly cloudy, with a low around 63. Chance of precipitation is 30%.

    Low: 63 °F

    Chance
    Showers

  • Saturday

    Saturday: A 30 percent chance of showers and thunderstorms, mainly after 1pm.  Mostly sunny, with a high near 78.

    High: 78 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 60.

    Low: 60 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 74.

    High: 74 °F

    Mostly Sunny

Detailed Forecast

Today
A slight chance of showers between 1pm and 3pm. Partly sunny, with a high near 78. Light and variable wind becoming north northeast 5 to 10 mph in the afternoon. Chance of precipitation is 20%.
Tonight
Mostly cloudy, with a low around 61. North northeast wind around 5 mph.
Thursday
Sunny, with a high near 79. North northeast wind around 5 mph becoming calm in the afternoon.
Thursday Night
Mostly clear, with a low around 60. Northeast wind around 5 mph becoming calm.
Friday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 79. Calm wind becoming south southwest around 5 mph in the morning. Winds could gust as high as 10 mph.
Friday Night
A chance of showers and thunderstorms before 1am, then a slight chance of showers. Partly cloudy, with a low around 63. Chance of precipitation is 30%.
Saturday
A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 78.
Saturday Night
Mostly clear, with a low around 60.
Sunday
Mostly sunny, with a high near 74.
Sunday Night
Partly cloudy, with a low around 57.
Monday
Mostly sunny, with a high near 75.
Monday Night
Partly cloudy, with a low around 59.
Tuesday
Mostly sunny, with a high near 78.
Basemap Options
Click map to change the forecast location
Loading map...

ABOUT THIS FORECAST

 
Point Forecast:
Merrillville IN
 41.47°N 87.33°W
3:46 am CDT Aug 19, 2026
6am CDT Aug 19, 2026-6pm CDT Aug 25, 2026
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database