Seymour, Illinois Weather
Fireflies pulse through the magnolias. Day 77 of spring. Read this microseason across nine climate regions →
Seymour weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Overcast——83°52°—
- ThursdayJun 4Overcast——85°58°+2°
- FridayJun 5Light Drizzle36%—79°67°-6°
- SaturdayJun 6Light Showers60%—85°65°+6°
- SundayJun 7Showers40%—84°70°-1°
- MondayJun 8Showers32%0.02″82°70°-2°
- TuesdayJun 9Light Drizzle19%—85°70°+3°
Ozone at AQI 500 now. AQI up 28 in the last 6 hours — air quality is degrading. With UV 0.2 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 85 by mid-afternoon.
AVOID OUTDOORS Avoid outdoor exertion. Keep windows closed; use HEPA filtration indoors if available.
What's driving it
Ozone × UV × Sky
Ozone at AQI 500 now. With UV 0.2 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 85 by mid-afternoon.
- Present
- AQI 500
- UV peak
- 0.2 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 85
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
- 4:23 AM
- Moonset
- 1:55 PM
- In sign
- ♑︎ Capricorn
Fireflies pulse through the magnolias
Seymour at a glance
- Today vs. normal: 3°F above the seasonal normal for this latitude
- Last frost: April 17 (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 — Seymour
SPC has placed Seymour 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.