Chesterfield, Illinois Weather
Cicadas claim the scorching afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Chesterfield weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Overcast36%—93°74°—
- SundayJul 5Drizzle19%0.10″83°74°-10°
- MondayJul 6Light Drizzle——84°69°+1°
- TuesdayJul 7Overcast——82°64°-2°
- WednesdayJul 8Overcast13%—88°65°+6°
- ThursdayJul 9Light Showers43%0.02″88°71°0°
- FridayJul 10Light Showers43%0.11″84°72°-4°
AQI 33 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 7.1 µg/m³, PM10 at 7.6 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 10 PM.
What's driving it
Ozone × UV × Sky
Ozone at AQI 39. Overcast through the UV peak window (cloud cover ~71%) — afternoon ozone should stay flat.
- Present
- AQI 39
- UV peak
- 4.8 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 13
PM × Wind × Precip
PM2.5 at 7.1 µg/m³, PM10 at 7.6 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.93
- 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
- 10:54 PM
- Moonset
- 10:07 AM
- In sign
- ♓︎ Pisces
Cicadas claim the scorching afternoon
Chesterfield at a glance
- Today vs. normal: 16°F above the seasonal normal for this latitude
- Last frost: April 12 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 62630
16-Day Forecast — Chesterfield
- Sat93°74°36%
- Sun83°74°19%
- Mon84°69°6%
- Tue82°64°5%
- Wed88°65°13%
- Thu88°71°43%
- Fri84°72°43%
- Sat83°70°26%
- Sun74°60°6%
- Mon74°57°5%
- Tue75°60°12%
- Wed80°63°10%
- Thu81°65°16%
- Fri82°67°23%
- Sat85°70°24%
- Sun86°72°23%
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 — Chesterfield
SPC has placed Chesterfield 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 Chesterfield
- 62630