Byron, IL Weather & Growing Conditions
Overnight
62°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely. Some of the storms could produce heavy rain. Cloudy, with a low around 62. East southeast wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New rainfall amounts between three quarters and one inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 62°F | Showers And Thunderstorms Likely | 10 mph ESE | 60% |
| Saturday | 78°F | Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 to 10 mph SE | 91% |
| Saturday Night | 62°F | Showers And Thunderstorms Likely then Showers And Thunderstorms | 5 to 10 mph NNE | 77% |
| Sunday | 67°F | Showers And Thunderstorms | 10 to 15 mph NE | 75% |
| Sunday Night | 52°F | Rain Showers Likely | 10 to 15 mph NE | 55% |
| Monday | 65°F | Chance Rain Showers | 15 mph ENE | 43% |
| Monday Night | 47°F | Chance Rain Showers | 10 to 15 mph NE | 40% |
| Tuesday | 64°F | Chance Rain Showers | 10 to 15 mph NE | 32% |
| Tuesday Night | 46°F | Mostly Cloudy | 5 to 10 mph NE | 8% |
| Wednesday | 67°F | Partly Sunny | 5 to 10 mph NE | 4% |
| Wednesday Night | 47°F | Partly Cloudy | 0 to 10 mph NE | 2% |
| Thursday | 68°F | Mostly Sunny | 0 to 5 mph NNE | 5% |
| Thursday Night | 49°F | Partly Cloudy | 0 to 5 mph NE | 5% |
| Friday | 71°F | Mostly Sunny | 0 to 5 mph NNE | 5% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Byron, IL
Last spring frost
Apr 24
First fall frost
Oct 17
Growing season
174 days
Hardiness zone
5b
Explore more for Byron, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Rockford Gtr Rockford Ap, Il (10 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.