Merrillville, Indiana Weather
Solstice approaches — longest light. Day 88 of spring. Read this microseason across nine climate regions →
Merrillville weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 15Overcast——73°54°—
- TuesdayJun 16Rain87%0.16″71°57°-2°
- WednesdayJun 17Showers90%0.34″75°57°+4°
- ThursdayJun 18Light Drizzle90%0.01″68°59°-7°
- FridayJun 19Overcast——71°59°+3°
- SaturdayJun 20Drizzle18%0.13″64°58°-7°
- SundayJun 21Drizzle38%0.15″63°60°-1°
AQI 30 (Good), driven by PM2.5. AQI down 5 over the last 6 hours (gradual decline). PM2.5 at 4.9 µg/m³ (AQI 27) with a 0.98 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
PM × Wind × Precip
PM2.5 at 4.9 µg/m³ (AQI 27) with a 0.98 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.98
- Wind
- light
- 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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 5:15 AM
- Moonset
- 8:42 PM
- In sign
- ♊︎ Gemini
Solstice approaches — longest light
Merrillville at a glance
- Today vs. normal: 20°F below the seasonal normal for this latitude
- Last frost: April 25 (climatological average for this latitude)
- Microseason: Jun 11–15
- Planting window: Stake and prune tomato suckers. Watch for squash vine borers.
15-Day Forecast — Merrillville
- Mon72°54°2%
- Tue71°57°87%
- Wed75°57°90%
- Thu68°59°90%
- Fri71°59°6%
- Sat64°58°18%
- Sun63°60°38%
- Mon72°57°38%
- Tue76°58°18%
- Wed82°60°12%
- Thu80°66°15%
- Fri84°65°26%
- Sat91°69°27%
- Sun94°77°33%
- Mon91°72°30%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of June 15, 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 Slight Risk category for severe thunderstorms day after tomorrow.
- TODAYNONENo severe risk
- TOMORROWMRGLMarginal Risk
- DAY 3SLGTSlight Risk
Scattered severe storms possible. A few tornadoes, hail, and damaging wind gusts possible.
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