Rock Island, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Rock Island, a city in Rock Island County, Illinois.
Tonight
66°F
Chance Showers And Thunderstorms then Showers And Thunderstorms
A chance of showers and thunderstorms before 9pm, then showers and thunderstorms likely between 9pm and 10pm, then showers and thunderstorms likely between 10pm and 11pm, then showers and thunderstorms. Mostly cloudy. Low around 66, with temperatures rising to around 70 overnight. South wind 0 to 5 mph. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.
7-day forecast for Rock Island
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 66°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 0 to 5 mph S | 90% |
| Sunday | 69°F | Showers And Thunderstorms Likely | 5 to 15 mph NE | 71% |
| Sunday Night | 59°F | Chance Rain Showers | 10 to 15 mph NE | 49% |
| Monday | 63°F | Rain Showers Likely | 10 to 15 mph NE | 68% |
| Monday Night | 55°F | Rain Showers Likely | 10 mph NE | 66% |
| Tuesday | 62°F | Rain Showers Likely | 10 mph NE | 56% |
| Tuesday Night | 52°F | Partly Cloudy | 5 to 10 mph NE | 6% |
| Wednesday | 64°F | Partly Sunny | 5 mph NE | 4% |
| Wednesday Night | 55°F | Partly Cloudy | 0 to 5 mph NE | 4% |
| Thursday | 67°F | Partly Sunny | 0 to 5 mph NE | 5% |
| Thursday Night | 58°F | Slight Chance Rain Showers | 0 to 5 mph NE | 16% |
| Friday | 70°F | Partly Sunny | 0 to 5 mph NE | 14% |
| Friday Night | 58°F | Partly Cloudy | 0 to 5 mph NE | 8% |
| Saturday | 72°F | Mostly Sunny | 0 to 5 mph E | 5% |
Forecast source: National Weather Service (api.weather.gov) for Rock Island (41.470, -90.583). Updated through the day.
Growing snapshot for Rock Island
Last spring frost
Apr 24
First fall frost
Oct 18
Growing season
176 days
Hardiness zone
5b
More local growing data for Rock Island: nearby ZIP 61201 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Moline Quad City Intl Ap, Il (2.8 mi from Rock Island). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.