Port Byron, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Port Byron, a village in Rock Island County, Illinois.
Tonight
53°F
Mostly Cloudy
Mostly cloudy. Low around 53, with temperatures rising to around 56 overnight. Southwest wind 10 to 15 mph.
7-day forecast for Port Byron
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 53°F | Mostly Cloudy | 10 to 15 mph SW | 10% |
| Wednesday | 57°F | Chance Rain Showers | 15 mph SW | 27% |
| Wednesday Night | 46°F | Mostly Cloudy | 15 mph SW | 13% |
| Thursday | 55°F | Chance Rain Showers | 10 to 15 mph W | 44% |
| Thursday Night | 41°F | Slight Chance Rain Showers then Mostly Cloudy | 10 mph NW | 15% |
| Friday | 50°F | Partly Sunny | 5 to 10 mph N | 6% |
| Friday Night | 32°F | Mostly Clear | 0 to 5 mph N | 0% |
| Saturday | 52°F | Sunny | 0 to 5 mph NW | 0% |
| Saturday Night | 35°F | Mostly Clear | 5 mph W | 2% |
| Sunday | 56°F | Sunny | 5 to 10 mph W | 2% |
| Sunday Night | 36°F | Clear | 5 mph W | 1% |
| Monday | 62°F | Sunny | 5 to 10 mph SW | 0% |
| Monday Night | 41°F | Mostly Clear | 5 mph W | 0% |
| Tuesday | 63°F | Sunny | 5 mph NW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Port Byron (41.624, -90.330). Updated through the day.
Growing snapshot for Port Byron
Last spring frost
Apr 16
First fall frost
Oct 25
Growing season
190 days
Hardiness zone
5b
More local growing data for Port Byron: nearby ZIP 61275 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Andalusia
Barstow
Buffalo Prairie
Carbon Cliff
Coal Valley
Cordova
Coyne Center
East Moline
Edgington
Hampton
Hillsdale
Illinois City
Joslin
Milan
Moline
Oak Grove
Rapids City
Rock Island
Silvis
Taylor Ridge
Climate data from the nearest NOAA station, Le Claire L&D 14, Ia (5.3 mi from Port Byron). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.