Shannon, Illinois Weather
Fireflies rise from the lawn. Day 77 of spring. Read this microseason across nine climate regions →
Shannon weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Overcast——84°59°—
- FridayJun 5Rain69%0.70″77°65°-7°
- SaturdayJun 6Light Drizzle49%—79°66°+2°
- SundayJun 7Showers31%—80°69°+1°
- MondayJun 8Light Showers68%0.09″74°67°-6°
- TuesdayJun 9Heavy Drizzle37%—83°68°+9°
- WednesdayJun 10Thunderstorm21%—87°68°+4°
Ozone at AQI 78 now. AQI up 6 over the last 6 hours (gradual rise). With UV 8.4 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 62 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 78 now. With UV 8.4 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 62 by mid-afternoon.
- Present
- AQI 78
- UV peak
- 8.4 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 62
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
- 4:36 AM
- Moonset
- 1:54 PM
- In sign
- ♒︎ Aquarius
Fireflies rise from the lawn
Shannon at a glance
- Today vs. normal: 10°F above the seasonal normal for this latitude
- 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 — Shannon
SPC has placed Shannon in the Marginal Risk category for severe thunderstorms tomorrow.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWMRGLMarginal Risk
- DAY 3TSTMGeneral Thunderstorms
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.