Forest City, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Forest City, a village in Mason County, Illinois.
This Afternoon
70°F
Light Rain
Rain and a slight chance of thunderstorms. Cloudy, with a high near 70. South wind 16 to 20 mph, with gusts as high as 33 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Forest City
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 70°F | Light Rain | 16 to 20 mph S | 90% |
| Tonight | 52°F | Light Rain | 12 to 16 mph S | 76% |
| Wednesday | 59°F | Chance Rain Showers then Mostly Cloudy | 10 to 14 mph SW | 10% |
| Wednesday Night | 45°F | Mostly Cloudy | 9 mph SW | 1% |
| Thursday | 59°F | Mostly Sunny | 7 to 12 mph WSW | 7% |
| Thursday Night | 42°F | Mostly Cloudy then Slight Chance Light Rain | 6 mph NW | 23% |
| Friday | 55°F | Mostly Cloudy | 8 mph NNW | 14% |
| Friday Night | 35°F | Mostly Cloudy | 1 to 6 mph N | 3% |
| Saturday | 54°F | Mostly Sunny | 3 mph WNW | 2% |
| Saturday Night | 34°F | Partly Cloudy | 2 mph W | 2% |
| Sunday | 60°F | Sunny | 2 to 6 mph WNW | 10% |
| Sunday Night | 34°F | Mostly Clear | 3 mph W | 5% |
| Monday | 64°F | Sunny | 2 to 8 mph SW | 1% |
| Monday Night | 39°F | Mostly Clear | 5 mph WSW | 1% |
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 Nov 3, 2026.