Glen Carbon, Illinois Weather
Cicadas claim the scorching afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Glen Carbon weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Overcast15%—94°76°—
- SundayJul 5Drizzle18%0.07″82°73°-12°
- MondayJul 6Light Drizzle20%—86°70°+4°
- TuesdayJul 7Overcast14%—84°67°-2°
- WednesdayJul 8Overcast13%—89°66°+5°
- ThursdayJul 9Light Drizzle30%—93°72°+4°
- FridayJul 10Thunderstorm30%0.02″88°72°-5°
AQI 41 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 7.2 µg/m³, PM10 at 7.7 µg/m³ — typical background levels with no transport signature.
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 38 now. With UV 3.6 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 18 around 1 PM.
- Present
- AQI 38
- UV peak
- 3.6 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 18
PM × Wind × Precip
PM2.5 at 7.2 µg/m³, PM10 at 7.7 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.94
- 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
- 10:53 PM
- Moonset
- 10:07 AM
- In sign
- ♓︎ Pisces
Cicadas claim the scorching afternoon
Glen Carbon at a glance
- Today vs. normal: 13°F above the seasonal normal for this latitude
- Last frost: April 9 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 62034
16-Day Forecast — Glen Carbon
- Sat94°76°15%
- Sun82°73°18%
- Mon86°70°20%
- Tue84°67°14%
- Wed89°66°13%
- Thu93°72°30%
- Fri88°72°30%
- Sat89°73°19%
- Sun77°62°11%
- Mon76°58°2%
- Tue78°61°5%
- Wed81°64°13%
- Thu82°66°13%
- Fri82°68°16%
- Sat85°69°23%
- Sun90°73°16%
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 — Glen Carbon
SPC has placed Glen Carbon in the Slight Risk category for severe thunderstorms today.
- TODAYSLGTSlight Risk
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3TSTMGeneral Thunderstorms
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 Glen Carbon
- 62034