Cahokia Heights, Illinois Weather
Fireflies pulse through the magnolias. Day 76 of spring. Read this microseason across nine climate regions →
Cahokia Heights weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Clear——83°54°—
- ThursdayJun 4Overcast——85°60°+2°
- FridayJun 5Light Drizzle24%—86°65°+1°
- SaturdayJun 6Showers23%—91°67°+5°
- SundayJun 7Heavy Drizzle35%—90°72°-1°
- MondayJun 8Light Drizzle55%—83°72°-7°
- TuesdayJun 9Drizzle32%0.01″84°71°+1°
Ozone at AQI 85 now. AQI up 10 over the last 6 hours (gradual rise). With UV 8.4 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 95 by mid-afternoon.
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 85 now. With UV 8.4 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 95 by mid-afternoon.
- Present
- AQI 85
- UV peak
- 8.4 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 95
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).
The higher the clouds, the finer the weather.
- Moonrise
- 3:47 AM
- Moonset
- 1:05 PM
- In sign
- ♑︎ Capricorn
Fireflies pulse through the magnolias
Cahokia Heights at a glance
- Today vs. normal: 6°F above the seasonal normal for this latitude
- Last frost: April 7 (climatological average for this latitude)
- Microseason: Jun 1–5
- Planting window: Harvest spring lettuce before it bolts. Sow heat-tolerant greens.
Right now in the garden
Peak growing season
As of June 3, 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 — Cahokia Heights
SPC has placed Cahokia Heights in the General Thunderstorms category for severe thunderstorms day after tomorrow.
- TODAYNONENo severe risk
- TOMORROWNONENo severe risk
- DAY 3TSTMGeneral Thunderstorms
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.