Sheffield, Illinois Weather
Fireflies rise from the lawn. Day 76 of spring. Read this microseason across nine climate regions →
Sheffield weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Overcast——82°50°—
- ThursdayJun 4Overcast——85°57°+3°
- FridayJun 5Showers61%0.09″80°67°-5°
- SaturdayJun 6Heavy Showers60%0.91″82°63°+2°
- SundayJun 7Overcast22%—82°65°0°
- MondayJun 8Showers34%0.06″74°67°-8°
- TuesdayJun 9Light Drizzle25%0.02″78°69°+4°
Ozone at AQI 75. AQI up 10 over the last 6 hours (gradual rise). Overcast through the UV peak window (cloud cover ~87%) — afternoon ozone should stay flat.
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 75. Overcast through the UV peak window (cloud cover ~87%) — afternoon ozone should stay flat.
- Present
- AQI 75
- UV peak
- 7.7 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 39
PM × Wind × Precip
PM2.5 at 6.6 µg/m³ (AQI 37) with a 0.80 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.80
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
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).
The higher the clouds, the finer the weather.
- Moonrise
- 3:55 AM
- Moonset
- 12:53 PM
- In sign
- ♑︎ Capricorn
Fireflies rise from the lawn
Sheffield at a glance
- Today vs. normal: 6°F above the seasonal normal for this latitude
- Last frost: April 24 (climatological average for this latitude)
- Microseason: Jun 1–5
- Planting window: Harvest spring lettuce before it bolts. Sow heat-tolerant greens.
Right now in the garden
Peak growing season
As of June 3, 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 — Sheffield
SPC has placed Sheffield in the Marginal Risk category for severe thunderstorms day after tomorrow.
- TODAYNONENo severe risk
- TOMORROWNONENo severe risk
- DAY 3MRGLMarginal Risk
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.