Rock City, IL Weather & Growing Conditions
Today
84°F
Mostly Sunny then Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms after 5pm. Mostly sunny. High near 84, with temperatures falling to around 81 in the afternoon. Southwest wind 5 to 10 mph. Chance of precipitation is 20%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 17% |
| Tonight | 65°F | Showers And Thunderstorms Likely | 5 mph NW | 85% |
| Wednesday | 75°F | Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 mph NW | 82% |
| Wednesday Night | 59°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 0 to 5 mph NW | 58% |
| Thursday | 77°F | Chance Rain Showers then Mostly Sunny | 5 mph NE | 26% |
| Thursday Night | 58°F | Mostly Clear | 0 mph | 7% |
| Friday | 80°F | Mostly Sunny | 0 to 5 mph S | 5% |
| Friday Night | 62°F | Mostly Clear | 5 mph S | 6% |
| Saturday | 82°F | Mostly Sunny | 5 to 10 mph SW | 11% |
| Saturday Night | 68°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 23% |
| Sunday | 84°F | Slight Chance Showers And Thunderstorms | 10 to 15 mph SW | 23% |
| Sunday Night | 67°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 to 10 mph SW | 43% |
| Monday | 83°F | Chance Showers And Thunderstorms | 5 to 10 mph S | 41% |
| Monday Night | 67°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 10 mph NW | 41% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Rock City, IL
Last spring frost
Apr 26
First fall frost
Oct 13
Growing season
169 days
Hardiness zone
5a
Explore more for Rock City, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Freeport Waste Wtp, Il (10.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.