Zion, Illinois Weather
Fireflies rise from the lawn. Day 76 of spring. Read this microseason across nine climate regions →
Zion weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Overcast——76°46°—
- ThursdayJun 4Overcast——86°57°+10°
- FridayJun 5Drizzle63%0.01″77°67°-9°
- SaturdayJun 6Heavy Drizzle57%0.02″80°58°+3°
- SundayJun 7Foggy——72°56°-8°
- MondayJun 8Light Drizzle10%—76°58°+4°
- TuesdayJun 9Light Drizzle18%0.01″77°67°+1°
PM2.5 at 9.3 µg/m³, PM10 at 10.0 µg/m³ — typical background levels with no transport signature. AQI flat over the last 6 hours (within ±3 points).
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 48. Overcast through the UV peak window (cloud cover ~62%) — afternoon ozone should stay flat.
- Present
- AQI 48
- UV peak
- 7.1 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 23
PM × Wind × Precip
PM2.5 at 9.3 µg/m³, PM10 at 10.0 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.93
- 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).
The higher the clouds, the finer the weather.
- Moonrise
- 3:53 AM
- Moonset
- 12:40 PM
- In sign
- ♑︎ Capricorn
Fireflies rise from the lawn
Zion at a glance
- Today vs. normal: 4°F above the seasonal normal for this latitude
- Last frost: May 1 (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 — Zion
SPC has placed Zion 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.