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.
Overnight
52°F
Mostly Cloudy
Mostly cloudy. Low around 52, with temperatures rising to around 56 overnight. Southwest wind around 10 mph, with gusts as high as 20 mph.
7-day forecast for Rock Island Arsenal
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 52°F | Mostly Cloudy | 10 mph SW | 7% |
| Wednesday | 55°F | Chance Rain Showers | 10 to 15 mph SW | 25% |
| Wednesday Night | 46°F | Mostly Cloudy | 10 mph SW | 14% |
| Thursday | 56°F | Chance Rain Showers | 10 mph W | 49% |
| Thursday Night | 42°F | Mostly Cloudy | 5 mph NW | 14% |
| Friday | 51°F | Partly Sunny | 5 to 10 mph N | 5% |
| Friday Night | 32°F | Partly Cloudy | 0 to 5 mph N | 0% |
| Saturday | 52°F | Sunny | 0 to 5 mph NW | 0% |
| Saturday Night | 35°F | Mostly Clear | 0 to 5 mph W | 2% |
| Sunday | 58°F | Sunny | 5 mph W | 2% |
| Sunday Night | 36°F | Clear | 0 to 5 mph W | 1% |
| Monday | 63°F | Sunny | 0 to 10 mph SW | 0% |
| Monday Night | 41°F | Mostly Clear | 0 to 5 mph W | 0% |
| Tuesday | 64°F | Sunny | 0 to 5 mph NW | 0% |
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 Nov 4, 2026.