Cary, Illinois Weather
Fireflies rise from the lawn. Day 77 of spring. Read this microseason across nine climate regions →
Cary weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Overcast——82°49°—
- ThursdayJun 4Overcast——86°58°+4°
- FridayJun 5Rain79%0.31″78°67°-8°
- SaturdayJun 6Heavy Showers62%0.61″84°63°+6°
- SundayJun 7Foggy——80°62°-4°
- MondayJun 8Light Showers21%0.02″78°65°-2°
- TuesdayJun 9Drizzle23%0.01″82°70°+4°
PM2.5 at 11.2 µg/m³ (AQI 55) with a 0.87 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust. AQI up 50 in the last 6 hours — air quality is degrading.
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 51. Overcast through the UV peak window (cloud cover ~88%) — afternoon ozone should stay flat.
- Present
- AQI 51
- UV peak
- 0.1 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 6
PM × Wind × Precip
PM2.5 at 11.2 µg/m³ (AQI 55) with a 0.87 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.87
- 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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 4:30 AM
- Moonset
- 1:47 PM
- In sign
- ♑︎ Capricorn
Fireflies rise from the lawn
Cary at a glance
- Today vs. normal: 71°F — typical for the season
- Last frost: April 29 (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 — Cary
SPC has placed Cary 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.