Byron, Illinois Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Byron weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Light Drizzle49%0.02″85°68°—
- SundayJul 5Overcast19%—83°65°-2°
- MondayJul 6Overcast11%—80°63°-3°
- TuesdayJul 7Overcast——80°57°0°
- WednesdayJul 8Overcast11%—81°62°+1°
- ThursdayJul 9Light Showers49%0.31″76°66°-5°
- FridayJul 10Overcast29%—79°62°+3°
AQI 24 (Good), driven by Ozone. AQI flat over the last 6 hours (within ±3 points). Ozone at AQI 33. Overcast through the UV peak window (cloud cover ~69%) — afternoon ozone should stay flat.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 10 PM.
What's driving it
Ozone × UV × Sky
Ozone at AQI 33. Overcast through the UV peak window (cloud cover ~69%) — afternoon ozone should stay flat.
- Present
- AQI 33
- UV peak
- 2.5 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 6
PM × Wind × Precip
PM2.5 at 4.6 µg/m³ (AQI 26) with a 0.77 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.77
- 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).
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
- Moonrise
- 10:55 PM
- Moonset
- 10:01 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Byron at a glance
- Today vs. normal: 7°F above the seasonal normal for this latitude
- Last frost: April 29 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 61010
16-Day Forecast — Byron
- Sat85°68°49%
- Sun83°65°19%
- Mon80°63°11%
- Tue80°57°1%
- Wed81°62°11%
- Thu76°66°49%
- Fri79°62°29%
- Sat82°62°11%
- Sun67°58°8%
- Mon74°55°9%
- Tue76°59°9%
- Wed79°62°26%
- Thu82°66°13%
- Fri83°68°26%
- Sat85°69°26%
- Sun83°71°32%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of July 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 — Byron
SPC includes Byron in the general thunderstorm area today — no severe risk, but storms are possible.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3NONENo severe risk
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.
ZIP codes in Byron
- 61010