Chester, Illinois Weather
Cicadas claim the scorching afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Chester weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Heavy Rain25%0.37″95°73°—
- SundayJul 5Light Rain28%0.12″85°72°-10°
- MondayJul 6Thunderstorm28%—88°70°+3°
- TuesdayJul 7Overcast19%—88°68°0°
- WednesdayJul 8Overcast13%—90°66°+2°
- ThursdayJul 9Overcast30%—95°72°+5°
- FridayJul 10Heavy Drizzle30%0.06″89°72°-6°
AQI 35 (Good), driven by PM2.5. AQI down 7 over the last 6 hours (gradual decline). PM2.5 at 8.2 µg/m³, PM10 at 9.0 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.
What's driving it
Ozone × UV × Sky
Ozone at AQI 32 now. With UV 2.6 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 8 around 1 PM.
- Present
- AQI 32
- UV peak
- 2.6 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 8
PM × Wind × Precip
PM2.5 at 8.2 µg/m³, PM10 at 9.0 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.91
- 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
- 10:51 PM
- Moonset
- 10:07 AM
- In sign
- ♓︎ Pisces
Cicadas claim the scorching afternoon
Chester at a glance
- Today vs. normal: 11°F above the seasonal normal for this latitude
- Last frost: April 4 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 62233
16-Day Forecast — Chester
- Sat95°73°25%
- Sun85°72°28%
- Mon88°70°28%
- Tue88°68°19%
- Wed90°66°13%
- Thu95°72°30%
- Fri89°72°30%
- Sat94°69°17%
- Sun80°64°12%
- Mon79°58°2%
- Tue80°59°5%
- Wed83°63°9%
- Thu78°64°10%
- Fri80°67°14%
- Sat89°69°16%
- Sun93°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 — Chester
SPC has placed Chester 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 Chester
- 62233
- 62259