Byron, Illinois Weather
Fireflies rise from the lawn. Day 76 of spring. Read this microseason across nine climate regions →
Byron weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Overcast——85°48°—
- ThursdayJun 4Overcast——87°56°+2°
- FridayJun 5Showers66%0.09″76°67°-11°
- SaturdayJun 6Heavy Showers59%0.56″81°65°+5°
- SundayJun 7Overcast18%—81°60°0°
- MondayJun 8Light Drizzle27%0.01″77°64°-4°
- TuesdayJun 9Drizzle26%—80°69°+3°
Ozone at AQI 50 now. AQI flat over the last 6 hours (within ±3 points). With UV 8.5 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 40 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 50 now. With UV 8.5 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 40 by mid-afternoon.
- Present
- AQI 50
- UV peak
- 8.5 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 40
PM × Wind × Precip
PM2.5 at 6.8 µg/m³ (AQI 38) with a 0.85 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.85
- Wind
- calm
- 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).
The higher the clouds, the finer the weather.
- Moonrise
- 3:56 AM
- Moonset
- 12:48 PM
- In sign
- ♑︎ Capricorn
Fireflies rise from the lawn
Byron at a glance
- Today vs. normal: 8°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 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 — Byron
SPC has placed Byron in the Marginal Risk category for severe thunderstorms day after tomorrow.
- TODAYNONENo severe risk
- TOMORROWTSTMGeneral Thunderstorms
- 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.