Forest City, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Forest City, a village in Mason County, Illinois.
Tonight
69°F
Partly Cloudy then Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms after 5am. Partly cloudy, with a low around 69. Southeast wind around 7 mph, with gusts as high as 16 mph. Chance of precipitation is 20%.
7-day forecast for Forest City
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 69°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 7 mph SE | 16% |
| Saturday | 89°F | Slight Chance Rain Showers then Mostly Cloudy | 7 mph S | 17% |
| Saturday Night | 68°F | Chance Showers And Thunderstorms | 3 to 7 mph ESE | 49% |
| Sunday | 79°F | Rain Showers Likely | 2 to 9 mph N | 66% |
| Sunday Night | 59°F | Showers And Thunderstorms Likely | 10 mph NE | 66% |
| Monday | 67°F | Showers And Thunderstorms Likely | 10 mph NE | 65% |
| Monday Night | 54°F | Chance Showers And Thunderstorms | 7 to 10 mph NE | 46% |
| Tuesday | 65°F | Chance Rain Showers | 9 mph NE | 27% |
| Tuesday Night | 51°F | Mostly Cloudy | 3 to 7 mph NNE | 5% |
| Wednesday | 69°F | Mostly Sunny | 6 mph NNE | 3% |
| Wednesday Night | 53°F | Partly Cloudy | 5 mph NNE | 1% |
| Thursday | 70°F | Mostly Sunny | 5 mph NNE | 4% |
| Thursday Night | 55°F | Partly Cloudy | 3 mph NNE | 3% |
| Friday | 72°F | Mostly Sunny | 5 mph NE | 4% |
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 Sep 19, 2026.