Fairfield, Illinois Weather
Fireflies pulse through the magnolias. Day 77 of spring. Read this microseason across nine climate regions →
Fairfield weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Clear——83°55°—
- ThursdayJun 4Overcast——84°62°+1°
- FridayJun 5Light Drizzle——79°64°-5°
- SaturdayJun 6Light Drizzle15%—87°64°+8°
- SundayJun 7Light Showers19%—86°70°-1°
- MondayJun 8Heavy Showers51%0.96″84°70°-2°
- TuesdayJun 9Drizzle34%—85°70°+1°
Ozone at AQI 68 now. AQI up 45 in the last 6 hours — air quality is degrading. With UV 0.0 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 16 by mid-afternoon.
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 68 now. With UV 0.0 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 16 by mid-afternoon.
- Present
- AQI 68
- UV peak
- 0.0 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 16
PM × Wind × Precip
PM2.5 at 5.1 µg/m³ (AQI 28) with a 0.91 fine-to-coarse ratio and 4 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.91
- Wind
- calm
- 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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 4:17 AM
- Moonset
- 2:00 PM
- In sign
- ♑︎ Capricorn
Fireflies pulse through the magnolias
Fairfield at a glance
- Today vs. normal: 75°F — typical for the season
- Last frost: April 6 (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 — Fairfield
SPC has placed Fairfield in the General Thunderstorms category for severe thunderstorms day after tomorrow.
- TODAYNONENo severe risk
- TOMORROWNONENo severe risk
- 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.