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.
Today
87°F
Mostly Sunny
Mostly sunny. High near 87, with temperatures falling to around 85 in the afternoon. Southwest wind around 5 mph.
7-day forecast for Rock Island Arsenal
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Mostly Sunny | 5 mph SW | 11% |
| Tonight | 68°F | Chance Showers And Thunderstorms | 5 mph NE | 78% |
| Wednesday | 80°F | Showers And Thunderstorms | 5 mph NE | 79% |
| Wednesday Night | 63°F | Showers And Thunderstorms Likely | 0 to 5 mph N | 74% |
| Thursday | 81°F | Chance Rain Showers then Mostly Sunny | 0 to 5 mph NE | 48% |
| Thursday Night | 63°F | Mostly Clear | 0 mph | 9% |
| Friday | 84°F | Mostly Sunny | 0 to 5 mph S | 5% |
| Friday Night | 66°F | Mostly Clear | 0 to 5 mph S | 9% |
| Saturday | 86°F | Sunny | 5 mph S | 9% |
| Saturday Night | 71°F | Mostly Clear then Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 16% |
| Sunday | 88°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 10 mph SW | 16% |
| Sunday Night | 71°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 34% |
| Monday | 87°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 34% |
| Monday Night | 71°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 10 mph W | 35% |
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 Aug 4, 2026.