Illiopolis, Illinois Weather
Sun climbs to its northern throne. Day 86 of spring. Read this microseason across nine climate regions →
Illiopolis weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 13Heavy Showers32%0.81″78°61°—
- SundayJun 14Rain33%0.33″70°59°-8°
- MondayJun 15Overcast——75°55°+5°
- TuesdayJun 16Showers33%0.19″77°56°+2°
- WednesdayJun 17Showers73%—79°62°+2°
- ThursdayJun 18Overcast73%—78°62°-1°
- FridayJun 19Partly Cloudy14%—72°58°-6°
AQI 22 (Good), driven by PM2.5. AQI down 13 over the last 6 hours (gradual decline). PM2.5 at 4.8 µg/m³ (AQI 27) with a 0.94 fine-to-coarse ratio and 4 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 4.8 µg/m³ (AQI 27) with a 0.94 fine-to-coarse ratio and 4 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.94
- 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).
Cut your thistles before St. John, you will have two instead of one.
- Moonrise
- 3:40 AM
- Moonset
- —
- In sign
- ♉︎ Taurus
Sun climbs to its northern throne
Illiopolis at a glance
- Today vs. normal: 12°F below the seasonal normal for this latitude
- Last frost: April 15 (climatological average for this latitude)
- Microseason: Jun 11–15
- Planting window: Prune spring-blooming shrubs after flowers fade.
15-Day Forecast — Illiopolis
- Sat77°62°32%
- Sun70°59°33%
- Mon75°55°0%
- Tue77°56°33%
- Wed79°62°73%
- Thu78°62°73%
- Fri72°58°14%
- Sat78°57°24%
- Sun81°62°28%
- Mon75°60°30%
- Tue80°58°13%
- Wed80°68°16%
- Thu77°66°23%
- Fri74°58°20%
- Sat71°53°32%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of June 13, 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 — Illiopolis
SPC has placed Illiopolis in the Slight Risk category for severe thunderstorms today.
- TODAYSLGTSlight Risk
- TOMORROWNONENo severe risk
- DAY 3NONENo severe 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 Illiopolis
- 62539