Merrillville, Indiana Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Merrillville weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Showers81%2.7″83°69°—
- SundayJul 5Foggy17%—74°66°-9°
- MondayJul 6Overcast——80°66°+6°
- TuesdayJul 7Overcast——81°65°+1°
- WednesdayJul 8Clear12%—86°65°+5°
- ThursdayJul 9Drizzle28%0.12″83°68°-3°
- FridayJul 10Overcast29%—79°66°-4°
AQI 39 (Good), driven by Ozone. AQI down 7 over the last 6 hours (gradual decline). Ozone at AQI 36. Overcast through the UV peak window (cloud cover ~100%) — afternoon ozone should stay flat.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 36. Overcast through the UV peak window (cloud cover ~100%) — afternoon ozone should stay flat.
- Present
- AQI 36
- UV peak
- 0.3 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 4
PM × Wind × Precip
PM2.5 at 5.4 µg/m³ (AQI 30) with a 0.95 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.95
- Wind
- calm
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
- Moonrise
- 10:46 PM
- Moonset
- 9:53 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Merrillville at a glance
- Today vs. normal: 70°F — typical for the season
- Last frost: April 25 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 46410
16-Day Forecast — Merrillville
- Sat83°69°81%
- Sun74°66°17%
- Mon80°66°5%
- Tue81°65°3%
- Wed86°65°12%
- Thu83°68°28%
- Fri79°66°29%
- Sat86°64°17%
- Sun71°62°9%
- Mon72°62°10%
- Tue77°64°11%
- Wed85°64°13%
- Thu88°68°29%
- Fri85°72°27%
- Sat91°70°11%
- Sun90°71°29%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of July 4, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
SPC Convective Outlook
Storm Prediction Center — Merrillville
SPC has placed Merrillville in the Marginal Risk category for severe thunderstorms today.
- TODAYMRGLMarginal Risk
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3TSTMGeneral Thunderstorms
Isolated severe storms possible. Limited threat for hail or damaging wind.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.
ZIP codes in Merrillville
- 46307
- 46410
- 46401
- 46411