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.
Today
86°F
Mostly Sunny
Mostly sunny. High near 86, with temperatures falling to around 84 in the afternoon. South wind 5 to 10 mph.
7-day forecast for Rock Island
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Mostly Sunny | 5 to 10 mph S | 10% |
| Tonight | 69°F | Chance Showers And Thunderstorms | 5 mph NE | 77% |
| Wednesday | 79°F | Showers And Thunderstorms | 5 mph NE | 79% |
| Wednesday Night | 65°F | Showers And Thunderstorms | 0 to 5 mph N | 75% |
| Thursday | 80°F | Chance Rain Showers then Mostly Sunny | 0 to 5 mph NE | 48% |
| Thursday Night | 64°F | Mostly Clear | 0 mph | 9% |
| Friday | 83°F | Mostly Sunny | 0 to 5 mph S | 5% |
| Friday Night | 67°F | Mostly Clear | 0 to 5 mph S | 10% |
| Saturday | 85°F | Sunny | 5 mph S | 9% |
| Saturday Night | 72°F | Mostly Clear then Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 16% |
| Sunday | 87°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 10 mph SW | 16% |
| Sunday Night | 72°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 33% |
| Monday | 86°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 33% |
| Monday Night | 72°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 10 mph W | 34% |
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 Aug 4, 2026.