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
81°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely before 11am, then a chance of showers and thunderstorms between 11am and noon, then a slight chance of showers and thunderstorms between noon and 1pm, then a chance of showers and thunderstorms between 1pm and 4pm, then a chance of showers and thunderstorms. Some of the storms could produce heavy rain. Mostly cloudy, with a high near 81. Southeast wind around 10 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Port Byron
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 81°F | Showers And Thunderstorms Likely | 10 mph SE | 73% |
| Tonight | 64°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 to 10 mph NW | 86% |
| Sunday | 70°F | Rain Showers | 10 to 15 mph NE | 76% |
| Sunday Night | 57°F | Chance Rain Showers | 15 mph NE | 44% |
| Monday | 64°F | Chance Rain Showers | 15 mph NE | 54% |
| Monday Night | 52°F | Chance Rain Showers | 10 to 15 mph NE | 42% |
| Tuesday | 63°F | Slight Chance Rain Showers | 10 to 15 mph NE | 20% |
| Tuesday Night | 49°F | Partly Cloudy | 5 to 10 mph NE | 7% |
| Wednesday | 67°F | Mostly Sunny | 5 to 10 mph NE | 2% |
| Wednesday Night | 52°F | Partly Cloudy | 5 to 10 mph NE | 1% |
| Thursday | 68°F | Mostly Sunny | 5 mph NE | 5% |
| Thursday Night | 54°F | Partly Cloudy | 5 mph NE | 5% |
| Friday | 71°F | Mostly Sunny | 5 mph NE | 4% |
| Friday Night | 53°F | Partly Cloudy | 5 mph E | 4% |
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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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 Sep 19, 2026.