Rock City, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Rock City, a village in Stephenson County, Illinois.
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 for Rock City
| 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) for Rock City (42.413, -89.471). Updated through the day.
Growing snapshot for Rock City
Last spring frost
Apr 26
First fall frost
Oct 13
Growing season
169 days
Hardiness zone
5a
More local growing data for Rock City: nearby ZIP 61070 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Adeline
Cedarville
Dakota
Davis
Freeport
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Lake Summerset
Lena
Orangeville
Pearl City
Ridott
Willow Lake
Winslow
Climate data from the nearest NOAA station, Freeport Waste Wtp, Il (10.6 mi from Rock City). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.