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.
Today
86°F
Mostly Sunny
Mostly sunny. High near 86, with temperatures falling to around 84 in the afternoon. Southwest wind 5 to 10 mph.
7-day forecast for Port Byron
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Mostly Sunny | 5 to 10 mph SW | 10% |
| Tonight | 68°F | Showers And Thunderstorms Likely | 5 mph N | 80% |
| Wednesday | 78°F | Showers And Thunderstorms | 5 mph N | 78% |
| Wednesday Night | 63°F | Showers And Thunderstorms | 5 mph N | 75% |
| Thursday | 80°F | Chance Rain Showers then Mostly Sunny | 5 mph NE | 46% |
| Thursday Night | 62°F | Mostly Clear | 0 mph | 9% |
| Friday | 82°F | Mostly Sunny | 0 to 5 mph SE | 5% |
| Friday Night | 65°F | Mostly Clear | 0 to 5 mph S | 8% |
| Saturday | 85°F | Sunny | 5 to 10 mph S | 10% |
| Saturday Night | 71°F | Mostly Clear then Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 18% |
| Sunday | 87°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 10 to 15 mph SW | 18% |
| Sunday Night | 71°F | Chance Showers And Thunderstorms | 5 to 10 mph S | 36% |
| Monday | 86°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 36% |
| Monday Night | 71°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 10 mph W | 35% |
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
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Rock Island
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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 Aug 4, 2026.