Byron, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Byron, a city in Ogle County, Illinois.
Today
84°F
Mostly Sunny
Mostly sunny, with a high near 84. Southwest wind around 10 mph.
7-day forecast for Byron
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Mostly Sunny | 10 mph SW | 7% |
| Tonight | 65°F | Chance Showers And Thunderstorms | 0 to 5 mph WSW | 74% |
| Wednesday | 76°F | Showers And Thunderstorms Likely | 5 mph WNW | 74% |
| Wednesday Night | 59°F | Showers And Thunderstorms | 0 to 5 mph NW | 75% |
| Thursday | 79°F | Chance Rain Showers then Partly Sunny | 0 to 5 mph NE | 36% |
| Thursday Night | 58°F | Mostly Clear | 0 mph | 14% |
| Friday | 81°F | Mostly Sunny | 0 to 5 mph S | 8% |
| Friday Night | 61°F | Mostly Clear | 0 to 5 mph S | 8% |
| Saturday | 84°F | Mostly Sunny | 0 to 10 mph SSW | 10% |
| Saturday Night | 67°F | Mostly Clear then Slight Chance Showers And Thunderstorms | 5 mph SSW | 21% |
| Sunday | 85°F | Slight Chance Showers And Thunderstorms | 5 to 15 mph SW | 21% |
| Sunday Night | 67°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 to 10 mph SSW | 40% |
| Monday | 84°F | Chance Showers And Thunderstorms | 5 to 10 mph SSW | 38% |
| Monday Night | 67°F | Chance Showers And Thunderstorms | 5 to 10 mph WNW | 43% |
Forecast source: National Weather Service (api.weather.gov) for Byron (42.122, -89.267). Updated through the day.
Growing snapshot for Byron
Last spring frost
Apr 24
First fall frost
Oct 17
Growing season
174 days
Hardiness zone
5b
More local growing data for Byron: nearby ZIP 61010 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Baileyville
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Forreston
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Mount Morris
Oregon
Polo
Rochelle
Stillman Valley
Climate data from the nearest NOAA station, Rockford Gtr Rockford Ap, Il (10 mi from Byron). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.