Rock Island Arsenal, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Rock Island Arsenal, a community in Scott County, Illinois.
This Afternoon
75°F
Mostly Sunny
Mostly sunny, with a high near 75. Southeast wind around 10 mph.
7-day forecast for Rock Island Arsenal
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 75°F | Mostly Sunny | 10 mph SE | 5% |
| Tonight | 68°F | Mostly Cloudy then Chance Showers And Thunderstorms | 5 to 10 mph E | 56% |
| Saturday | 84°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 to 10 mph S | 69% |
| Saturday Night | 65°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 mph NW | 79% |
| Sunday | 72°F | Showers And Thunderstorms Likely | 5 to 15 mph NE | 79% |
| Sunday Night | 58°F | Showers And Thunderstorms Likely | 10 to 15 mph NE | 57% |
| Monday | 66°F | Rain Showers Likely | 10 to 15 mph NE | 57% |
| Monday Night | 54°F | Chance Rain Showers | 10 to 15 mph NE | 52% |
| Tuesday | 64°F | Chance Showers And Thunderstorms | 10 mph NE | 45% |
| Tuesday Night | 50°F | Partly Cloudy | 5 to 10 mph NE | 5% |
| Wednesday | 68°F | Mostly Sunny | 5 mph NE | 2% |
| Wednesday Night | 53°F | Partly Cloudy | 0 to 5 mph NE | 2% |
| Thursday | 70°F | Mostly Sunny | 0 to 5 mph NE | 5% |
| Thursday Night | 55°F | Partly Cloudy | 0 to 5 mph NE | 6% |
Forecast source: National Weather Service (api.weather.gov) for Rock Island Arsenal (41.517, -90.540). Updated through the day.
Growing snapshot for Rock Island Arsenal
Last spring frost
Apr 19
First fall frost
Oct 22
Growing season
184 days
Hardiness zone
5b
More local growing data for Rock Island Arsenal: nearby ZIP 52803 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Rock Island L&D 15, Il (1.5 mi from Rock Island Arsenal). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.