National Weather Service Forecast for: 3 Miles NW Merrillville IN
Issued by: National Weather Service Chicago, IL
Updated: 12:16 pm CST Dec 20, 2025
 
This
Afternoon
This Afternoon: Mostly cloudy, with a temperature falling to around 36 by 5pm. West wind 10 to 15 mph, with gusts as high as 25 mph.
Mostly Cloudy

 Tonight

Tonight: Mostly clear, with a low around 20. Northwest wind 10 to 15 mph, with gusts as high as 30 mph.
Mostly Clear

 Sunday

Sunday: Sunny, with a high near 29. Northwest wind 5 to 10 mph becoming south southwest in the afternoon. Winds could gust as high as 15 mph.
Sunny

 Sunday
Night
Sunday Night: Increasing clouds, with a low around 21. Light south southwest wind becoming south 5 to 10 mph in the evening.
Increasing
Clouds
 Monday

Monday: Cloudy, with a high near 40. South wind 10 to 15 mph, with gusts as high as 20 mph.
Cloudy

 Monday
Night
Monday Night: Mostly cloudy, with a low around 36.
Mostly Cloudy

 Tuesday

Tuesday: Partly sunny, with a high near 46.
Partly Sunny

 Tuesday
Night
Tuesday Night: Mostly cloudy, with a low around 31.
Mostly Cloudy

 Wednesday

Wednesday: A chance of rain after noon. Mostly cloudy, with a high near 44.
Mostly Cloudy
then Chance
Rain
Hi 42 °F⇓ Lo 20 °F Hi 29 °F Lo 21 °F Hi 40 °F Lo 36 °F Hi 46 °F Lo 31 °F Hi 44 °F

 

This Afternoon
 
 Mostly cloudy, with a temperature falling to around 36 by 5pm. West wind 10 to 15 mph, with gusts as high as 25 mph.
Tonight
 
 Mostly clear, with a low around 20. Northwest wind 10 to 15 mph, with gusts as high as 30 mph.
Sunday
 
 Sunny, with a high near 29. Northwest wind 5 to 10 mph becoming south southwest in the afternoon. Winds could gust as high as 15 mph.
Sunday Night
 
 Increasing clouds, with a low around 21. Light south southwest wind becoming south 5 to 10 mph in the evening.
Monday
 
 Cloudy, with a high near 40. South wind 10 to 15 mph, with gusts as high as 20 mph.
Monday Night
 
 Mostly cloudy, with a low around 36.
Tuesday
 
 Partly sunny, with a high near 46.
Tuesday Night
 
 Mostly cloudy, with a low around 31.
Wednesday
 
 A chance of rain after noon. Mostly cloudy, with a high near 44.
Wednesday Night
 
 A chance of rain before midnight. Cloudy, with a low around 44.
Christmas Day
 
 Mostly cloudy, with a high near 57.
Thursday Night
 
 Partly cloudy, with a low around 41.
Friday
 
 Partly sunny, with a high near 52.

 

Forecast from NOAA-NWS for 3 Miles NW Merrillville IN.