Forest City, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Forest City, a village in Mason County, Illinois.
Today
87°F
Mostly Sunny
Mostly sunny, with a high near 87. South wind around 6 mph.
7-day forecast for Forest City
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Mostly Sunny | 6 mph S | 0% |
| Tonight | 67°F | Partly Cloudy | 5 mph SSE | 11% |
| Wednesday | 85°F | Chance Showers And Thunderstorms | 5 mph SSW | 34% |
| Wednesday Night | 66°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 3 mph S | 90% |
| Thursday | 81°F | Showers And Thunderstorms then Chance Showers And Thunderstorms | 3 mph S | 81% |
| Thursday Night | 64°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 1 mph SE | 16% |
| Friday | 84°F | Mostly Sunny | 1 mph WSW | 7% |
| Friday Night | 66°F | Slight Chance Showers And Thunderstorms | 1 mph S | 21% |
| Saturday | 86°F | Slight Chance Showers And Thunderstorms then Sunny | 3 mph SSW | 15% |
| Saturday Night | 70°F | Mostly Clear | 3 mph S | 9% |
| Sunday | 89°F | Sunny | 5 to 8 mph SSW | 6% |
| Sunday Night | 72°F | Mostly Clear then Slight Chance Showers And Thunderstorms | 7 mph S | 18% |
| Monday | 89°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 7 mph SSW | 18% |
| Monday Night | 72°F | Slight Chance Showers And Thunderstorms | 6 mph SSW | 25% |
Forecast source: National Weather Service (api.weather.gov) for Forest City (40.372, -89.832). Updated through the day.
Growing snapshot for Forest City
Last spring frost
Apr 17
First fall frost
Oct 19
Growing season
185 days
Hardiness zone
6a
More local growing data for Forest City: nearby ZIP 61532 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Havana, Il (13.9 mi from Forest City). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.