Indiana · NWS LOT office

Merrillville, IN weather

It is 57°F and cloudy at Gary Regional Airport as of Oct 28, 3:55 AM CDT. Overnight: Mostly Cloudy, low near 50°F, 2% chance of precipitation. Forecast from the National Weather Service, issued Oct 28, 3:35 AM CDT.

Updated Oct 28, 4:23 AM CDT (snapshot)

Current conditions

Temperature

57°F

Cloudy

Wind

S 5 mph

Humidity 100% · dew point 57°F

Pressure · visibility

30.21 inHg

Visibility 10 mi

Observed at Gary Regional Airport (KGYY), Oct 28, 3:55 AM CDT. Station readings can lag or be missing.

Alerts for this area

No active NWS alerts cover the Merrillville forecast zone right now.

Around the NWS LOT forecast area

No active alerts in zones served by the LOT office near Merrillville.

From the alert snapshot of Oct 28, 2026, 5:12 AM EDT. Indiana has 2 active alerts: see them all.

For official warnings, check weather.gov and your local authorities. OpenForecast repeats National Weather Service alerts and may be delayed or incomplete. Follow instructions from emergency officials.

Next 24 hours

Hourly forecast for Merrillville (local time)
TimeTempForecastPrecip. chanceWind
Wed 6 AM50°FMostly Sunny1% 0 mph
Wed 7 AM50°FMostly Sunny1% 0 mph
Wed 8 AM52°FMostly Sunny1%S 5 mph
Wed 9 AM57°FMostly Sunny1%S 5 mph
Wed 10 AM62°FSunny0%S 5 mph
Wed 11 AM66°FSunny0%S 10 mph
Wed 12 PM69°FSunny0%S 10 mph
Wed 1 PM72°FSunny0%S 10 mph
Wed 2 PM74°FSunny0%SSW 10 mph
Wed 3 PM74°FSunny0%S 10 mph
Wed 4 PM73°FSunny1%S 10 mph
Wed 5 PM71°FSunny1%S 10 mph
Wed 6 PM68°FMostly Clear1%S 5 mph
Wed 7 PM65°FMostly Clear1%S 5 mph
Wed 8 PM63°FMostly Clear1%S 5 mph
Wed 9 PM62°FMostly Clear1%S 10 mph
Wed 10 PM61°FMostly Clear1%S 10 mph
Wed 11 PM60°FMostly Clear1%S 10 mph
Thu 12 AM60°FPartly Cloudy1%S 10 mph
Thu 1 AM60°FPartly Cloudy1%S 10 mph
Thu 2 AM60°FPartly Cloudy2%S 10 mph
Thu 3 AM60°FMostly Cloudy2%SSW 10 mph
Thu 4 AM59°FPartly Cloudy3%SSW 10 mph
Thu 5 AM58°FPartly Cloudy4%SSW 10 mph

Hourly values come from the NWS gridded forecast for the 2.5 km grid square that covers the city's center point. Conditions elsewhere in Merrillville can differ.

7-day forecast

Overnight

Low 50°F

Mostly cloudy, with a low around 50. South wind around 0 mph.

Wednesday

High 74°F·Low 58°F

Sunny. High near 74, with temperatures falling to around 71 in the afternoon. South wind 0 to 10 mph.

Wednesday Night: Partly cloudy, with a low around 58. South southwest wind 5 to 10 mph.

Thursday

High 71°F·Low 47°F

A chance of rain showers between 9am and 3pm. Partly sunny, with a high near 71. West wind 5 to 15 mph. Chance of precipitation is 30%.

Thursday Night: Mostly clear, with a low around 47. North wind 0 to 5 mph, with gusts as high as 10 mph.

Friday

High 65°F·Low 50°F

Mostly sunny, with a high near 65.

Friday Night: A slight chance of rain showers between 7pm and 1am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 50.

Saturday

High 64°F·Low 50°F

A chance of showers and thunderstorms. Cloudy, with a high near 64.

Saturday Night: A slight chance of rain showers. Mostly cloudy, with a low around 50.

Sunday

High 69°F·Low 52°F

A chance of rain showers. Mostly cloudy, with a high near 69.

Sunday Night: A chance of rain showers. Mostly cloudy, with a low around 52.

Monday

High 68°F·Low 53°F

A chance of rain showers. Mostly cloudy, with a high near 68.

Monday Night: A chance of rain showers. Mostly cloudy, with a low around 53.

Tuesday

High 68°F

Rain showers likely. Mostly cloudy, with a high near 68.

Nearby cities

Larger cities in the area

Other cities in Lake County

See every city we cover in Indiana, or check all active alerts.

About this forecast

Forecast office
Merrillville is served by the National Weather Service LOT forecast office, forecast zone INZ001, county zone INC089.
Location used
The Census Bureau's internal point for Merrillville (41.4727, -87.3181), in Lake County. Population: 36,989 (2024 estimate), number 27 of the 48 Indiana cities on this site.
Radar
Nearest NWS radar: KLOT. View it on radar.weather.gov.

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Sources

  • Forecast, hourly forecast, observations and alerts: National Weather Service API, api.weather.gov/points/41.4727,-87.3181 (forecast issued Oct 28, 3:35 AM CDT).
  • Official forecast page: forecast.weather.gov.
  • City location and population: U.S. Census Bureau, Vintage 2024 population estimates and 2024 Gazetteer files.
  • Snapshot taken Oct 28, 2026. The NWS and Census Bureau do not endorse OpenForecast.

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