Charleston, Illinois Weather
Cicadas claim the scorching afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Charleston weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Heavy Rain52%0.60″90°70°—
- SundayJul 5Overcast22%—83°71°-7°
- MondayJul 6Light Drizzle14%—84°69°+1°
- TuesdayJul 7Overcast——82°63°-2°
- WednesdayJul 8Clear17%—84°63°+2°
- ThursdayJul 9Thunderstorm33%—86°70°+2°
- FridayJul 10Light Drizzle35%—81°68°-5°
AQI 30 (Good), driven by PM2.5. AQI down 8 over the last 6 hours (gradual decline). PM2.5 at 6.5 µg/m³, PM10 at 7.2 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 35 now. With UV 5.0 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 23 around 1 PM.
- Present
- AQI 35
- UV peak
- 5.0 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 23
PM × Wind × Precip
PM2.5 at 6.5 µg/m³, PM10 at 7.2 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.90
- 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
- 10:47 PM
- Moonset
- 9:59 AM
- In sign
- ♓︎ Pisces
Cicadas claim the scorching afternoon
Charleston at a glance
- Today vs. normal: 9°F above the seasonal normal for this latitude
- Last frost: April 13 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 61920
16-Day Forecast — Charleston
- Sat90°70°52%
- Sun83°71°22%
- Mon84°69°14%
- Tue82°63°7%
- Wed84°63°17%
- Thu86°70°33%
- Fri81°68°35%
- Sat84°68°28%
- Sun73°59°10%
- Mon70°56°6%
- Tue77°60°7%
- Wed80°62°19%
- Thu82°65°26%
- Fri83°69°29%
- Sat85°70°29%
- Sun81°72°35%
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 — Charleston
SPC has placed Charleston 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 Charleston
- 61920