Merrillville, IN Weather Forecast
Local 7-day forecast
Partly Sunny then Chance Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for Merrillville, IN in one place.
A slight chance of rain showers between 1pm and 3pm, then a chance of showers and thunderstorms between 3pm and 5pm, then a slight chance of showers and thunderstorms. Partly sunny, with a high near 76. South southeast wind 0 to 5 mph, with gusts as high as 15 mph. Chance of precipitation is 30%.
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: Oct 8, 2026 11:38 AM CDT.
The active forecast window currently covers Oct 9 to Oct 14, 2026 for Merrillville, IN.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Oct 9 to Oct 14, 2026
- Latest sync
- Oct 8, 2026 11:38 AM CDT
- Forecast office
- LOT
- Source
- NOAA / NWS
Daily Outlook
This Week in Merrillville
Saturday looks like the warmest upcoming period in Merrillville at 81 degrees F.
Tuesday Night is the coolest period ahead with temperatures near 46 degrees F.
The strongest winds are forecast for Tuesday at about 10 to 15 mph NNW.
Precipitation is mentioned in 8 upcoming forecast periods.
Forecast Details
- Last updated
- Oct 8, 2026 11:38 AM 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 59. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Mostly sunny, with a high near 81. South wind around 10 mph, with gusts as high as 20 mph.
A chance of rain showers after 1am. Mostly cloudy, with a low around 60. Chance of precipitation is 40%.
A chance of rain showers before 1pm. Partly sunny, with a high near 72.
Partly cloudy, with a low around 56.
A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 79.
A slight chance of showers and thunderstorms before 7pm, then a chance of showers and thunderstorms. Partly cloudy, with a low around 56.
A chance of rain showers. Partly sunny, with a high near 67.
A slight chance of rain showers before 7pm. Partly cloudy, with a low around 46.
Mostly sunny, with a high near 64.
A slight chance of rain showers after 1am. Partly cloudy, with a low around 48.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Friday
Oct 9
|
Partly Sunny then Chance Showers And Thunderstorms
|
76°F |
0 to 5 mph
SSE
|
|
Friday Night
Oct 9
|
Mostly Clear
|
59°F |
5 to 10 mph
SSE
|
|
Saturday
Oct 10
|
Mostly Sunny
|
81°F |
10 mph
S
|
|
Saturday Night
Oct 10
|
Mostly Cloudy then Chance Rain Showers
|
60°F |
5 to 10 mph
SSE
|
|
Sunday
Oct 11
|
Chance Rain Showers
|
72°F |
5 mph
ESE
|
|
Sunday Night
Oct 11
|
Partly Cloudy
|
56°F |
0 to 5 mph
S
|
|
Columbus Day
Oct 12
|
Mostly Sunny then Slight Chance Showers And Thunderstorms
|
79°F |
0 to 10 mph
SW
|
|
Monday Night
Oct 12
|
Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms
|
56°F |
5 to 10 mph
W
|
|
Tuesday
Oct 13
|
Chance Rain Showers
|
67°F |
10 to 15 mph
NNW
|
|
Tuesday Night
Oct 13
|
Slight Chance Rain Showers then Partly Cloudy
|
46°F |
5 to 10 mph
N
|
|
Wednesday
Oct 14
|
Mostly Sunny
|
64°F |
5 mph
SE
|
|
Wednesday Night
Oct 14
|
Partly Cloudy then Slight Chance Rain Showers
|
48°F |
5 mph
SSE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Merrillville.
