Illinois City, Illinois Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Illinois City weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Overcast43%—85°68°—
- SundayJul 5Overcast19%—85°70°0°
- MondayJul 6Mostly Clear——81°65°-4°
- TuesdayJul 7Clear——80°62°-1°
- WednesdayJul 8Overcast20%—83°63°+3°
- ThursdayJul 9Drizzle28%—80°69°-3°
- FridayJul 10Overcast24%—81°65°+1°
AQI 22 (Good), driven by Ozone. AQI down 6 over the last 6 hours (gradual decline). Ozone at AQI 31. Overcast through the UV peak window (cloud cover ~79%) — afternoon ozone should stay flat.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 9 PM.
What's driving it
Ozone × UV × Sky
Ozone at AQI 31. Overcast through the UV peak window (cloud cover ~79%) — afternoon ozone should stay flat.
- Present
- AQI 31
- UV peak
- 2.8 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 6
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
- 11:00 PM
- Moonset
- 10:08 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Illinois City at a glance
- Today vs. normal: 5°F above the seasonal normal for this latitude
- Last frost: April 24 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 61259
16-Day Forecast — Illinois City
- Sat85°68°43%
- Sun85°70°19%
- Mon81°65°2%
- Tue80°62°3%
- Wed83°63°20%
- Thu80°69°28%
- Fri81°65°24%
- Sat84°66°14%
- Sun69°58°11%
- Mon74°55°6%
- Tue77°61°8%
- Wed80°64°10%
- Thu81°66°19%
- Fri81°68°19%
- Sat84°70°19%
- Sun86°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 — Illinois City
SPC has placed Illinois City in the Marginal Risk category for severe thunderstorms today.
- TODAYMRGLMarginal Risk
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3NONENo severe risk
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 Illinois City
- 61259