Romeoville, Illinois Weather
Cicadas claim the afternoon. Day 15 of summer. Read this microseason across nine climate regions →
Romeoville weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 5Overcast25%—76°67°—
- MondayJul 6Overcast——78°63°+2°
- TuesdayJul 7Overcast——83°62°+5°
- WednesdayJul 8Overcast——82°63°-1°
- ThursdayJul 9Thunderstorm59%—83°69°+1°
- FridayJul 10Showers52%—80°68°-3°
- SaturdayJul 11Light Drizzle21%—81°66°+1°
AQI 48 (Good), driven by Ozone. AQI flat over the last 6 hours (within ±4 points). Ozone at AQI 73. Overcast through the UV peak window (cloud cover ~89%) — 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 73. Overcast through the UV peak window (cloud cover ~89%) — afternoon ozone should stay flat.
- Present
- AQI 73
- UV peak
- 5.3 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 26
PM × Wind × Precip
PM2.5 at 12.3 µg/m³, PM10 at 13.2 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.93
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- background
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
- 11:11 PM
- Moonset
- 11:04 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Romeoville at a glance
- Today vs. normal: 3°F above the seasonal normal for this latitude
- Last frost: April 26 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 60446
16-Day Forecast — Romeoville
- Sun76°67°25%
- Mon78°63°4%
- Tue83°62°0%
- Wed82°63°5%
- Thu83°69°59%
- Fri80°68°52%
- Sat81°66°21%
- Sun84°70°14%
- Mon77°60°10%
- Tue76°55°7%
- Wed79°57°9%
- Thu80°62°23%
- Fri83°63°15%
- Sat84°67°19%
- Sun85°65°24%
- Mon89°68°19%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of July 5, 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 — Romeoville
SPC includes Romeoville in the general thunderstorm area today — no severe risk, but storms are possible.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWNONENo severe risk
- DAY 3NONENo severe risk
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
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 Romeoville
- 60446