Greenfield, Illinois Weather
Fireflies pulse through the magnolias. Day 77 of spring. Read this microseason across nine climate regions →
Greenfield weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Partly Cloudy——83°58°—
- FridayJun 5Overcast25%—85°66°+2°
- SaturdayJun 6Drizzle17%—86°70°+1°
- SundayJun 7Showers42%0.29″76°69°-10°
- MondayJun 8Light Showers65%—88°69°+12°
- TuesdayJun 9Thunderstorm35%—92°72°+4°
- WednesdayJun 10Thunderstorm15%—92°74°0°
Ozone at AQI 500 now. AQI up 17 in the last 6 hours — air quality is degrading. With UV 6.0 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 400 by mid-afternoon.
AVOID OUTDOORS Avoid outdoor exertion. Keep windows closed; use HEPA filtration indoors if available.
What's driving it
Ozone × UV × Sky
Ozone at AQI 500 now. With UV 6.0 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 400 by mid-afternoon.
- Present
- AQI 500
- UV peak
- 6.0 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 400
PM × Wind × Precip
PM2.5 at 9.3 µg/m³, PM10 at 11.4 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.82
- Wind
- breezy
- 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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 4:28 AM
- Moonset
- 2:05 PM
- In sign
- ♒︎ Aquarius
Fireflies pulse through the magnolias
Greenfield at a glance
- Today vs. normal: 5°F above the seasonal normal for this latitude
- Last frost: April 12 (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 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 — Greenfield
SPC has placed Greenfield in the General Thunderstorms category for severe thunderstorms tomorrow.
- TODAYNONENo severe risk
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3TSTMGeneral Thunderstorms
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
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.