Clayton, Illinois Weather
Cicadas claim the scorching afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Clayton weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Overcast19%—88°71°—
- SundayJul 5Light Rain22%0.06″83°71°-5°
- MondayJul 6Overcast12%—83°66°0°
- TuesdayJul 7Clear——82°62°-1°
- WednesdayJul 8Overcast10%—87°64°+5°
- ThursdayJul 9Drizzle27%—88°71°+1°
- FridayJul 10Drizzle26%—83°70°-5°
AQI 26 (Good), driven by PM2.5. AQI down 8 over the last 6 hours (gradual decline). PM2.5 at 8.8 µg/m³, PM10 at 10.0 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 during the projected peak around 8 PM.
What's driving it
Ozone × UV × Sky
Ozone at AQI 32. Overcast through the UV peak window (cloud cover ~99%) — afternoon ozone should stay flat.
- Present
- AQI 32
- UV peak
- 4.2 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 9
PM × Wind × Precip
PM2.5 at 8.8 µg/m³, PM10 at 10.0 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.88
- 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
- 10:58 PM
- Moonset
- 10:10 AM
- In sign
- ♓︎ Pisces
Cicadas claim the scorching afternoon
Clayton at a glance
- Today vs. normal: 7°F above the seasonal normal for this latitude
- Last frost: April 16 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 62324
16-Day Forecast — Clayton
- Sat89°71°19%
- Sun83°71°22%
- Mon83°66°12%
- Tue82°62°7%
- Wed87°64°10%
- Thu88°71°27%
- Fri83°70°26%
- Sat84°68°20%
- Sun73°58°13%
- Mon75°57°5%
- Tue77°60°6%
- Wed82°64°12%
- Thu83°65°13%
- Fri82°67°19%
- Sat85°69°13%
- Sun87°72°13%
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 — Clayton
SPC has placed Clayton in the Marginal Risk category for severe thunderstorms today.
- TODAYMRGLMarginal Risk
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3TSTMGeneral Thunderstorms
Isolated severe storms possible. Limited threat for hail or damaging wind.
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 Clayton
- 62324