Merrillville, IN Weather Forecast
Local 7-day forecast
Mostly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Merrillville, IN in one place.
Mostly sunny. High near 76, with temperatures falling to around 72 in the afternoon. Northwest wind 0 to 5 mph.
Local Weather Overview
This forecast page for Merrillville, IN is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Aug 23, 2026 6:16 PM CDT.
The active forecast window currently covers Aug 24 to Aug 29, 2026 for Merrillville, IN.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Aug 24 to Aug 29, 2026
- Latest sync
- Aug 23, 2026 6:16 PM CDT
- Forecast office
- LOT
- Source
- NOAA / NWS
Daily Outlook
This Week in Merrillville
Wednesday looks like the warmest upcoming period in Merrillville at 82 degrees F.
Monday Night is the coolest period ahead with temperatures near 56 degrees F.
The strongest winds are forecast for Wednesday at about 5 to 10 mph SSW.
Precipitation is mentioned in 3 upcoming forecast periods.
Forecast Details
- Last updated
- Aug 23, 2026 6:16 PM CDT
- Coverage
- 6 days
- Time zone
- America/Chicago
- Forecast office
- LOT
- Radar station
- KLOT
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Mostly clear, with a low around 56. East southeast wind 0 to 5 mph.
Sunny, with a high near 79. South wind 0 to 5 mph.
Partly cloudy, with a low around 61.
A chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 82.
A chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 64.
Sunny, with a high near 80.
Mostly clear, with a low around 62.
Sunny, with a high near 79.
Partly cloudy, with a low around 61.
Mostly sunny, with a high near 79.
A chance of rain showers after 1am. Mostly cloudy, with a low around 64.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Monday
Aug 24
|
Mostly Sunny
|
76°F |
0 to 5 mph
NW
|
|
Monday Night
Aug 24
|
Mostly Clear
|
56°F |
0 to 5 mph
ESE
|
|
Tuesday
Aug 25
|
Sunny
|
79°F |
0 to 5 mph
S
|
|
Tuesday Night
Aug 25
|
Partly Cloudy
|
61°F |
5 mph
S
|
|
Wednesday
Aug 26
|
Mostly Sunny then Chance Showers And Thunderstorms
|
82°F |
5 to 10 mph
SSW
|
|
Wednesday Night
Aug 26
|
Chance Showers And Thunderstorms
|
64°F |
5 to 10 mph
WSW
|
|
Thursday
Aug 27
|
Sunny
|
80°F |
5 mph
NW
|
|
Thursday Night
Aug 27
|
Mostly Clear
|
62°F |
0 to 5 mph
SW
|
|
Friday
Aug 28
|
Sunny
|
79°F |
0 to 5 mph
NNW
|
|
Friday Night
Aug 28
|
Partly Cloudy
|
61°F |
0 to 5 mph
E
|
|
Saturday
Aug 29
|
Mostly Sunny
|
79°F |
0 to 5 mph
SSE
|
|
Saturday Night
Aug 29
|
Mostly Cloudy then Chance Rain Showers
|
64°F |
5 mph
SSE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Merrillville.
