Tonica, Illinois Weather
Fireflies rise from the lawn. Day 77 of spring. Read this microseason across nine climate regions →
Tonica weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Overcast——83°57°—
- FridayJun 5Heavy Showers34%1.4″77°68°-6°
- SaturdayJun 6Showers70%—83°69°+6°
- SundayJun 7Light Showers30%—85°70°+2°
- MondayJun 8Light Showers67%—81°70°-4°
- TuesdayJun 9Light Showers37%—82°69°+1°
- WednesdayJun 10Light Drizzle26%0.01″82°70°0°
Ozone at AQI 81 now. AQI up 5 over the last 6 hours (gradual rise). With UV 8.6 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 66 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 81 now. With UV 8.6 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 66 by mid-afternoon.
- Present
- AQI 81
- UV peak
- 8.6 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 66
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
- 4:29 AM
- Moonset
- 1:54 PM
- In sign
- ♒︎ Aquarius
Fireflies rise from the lawn
Tonica at a glance
- Today vs. normal: 6°F above the seasonal normal for this latitude
- Last frost: April 23 (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 — Tonica
SPC has placed Tonica in the Marginal Risk category for severe thunderstorms tomorrow.
- TODAYNONENo severe risk
- 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.