Forest City, IL Weather & Growing Conditions
This Afternoon
71°F
Light Rain
Rain and a slight chance of thunderstorms. Cloudy, with a high near 71. South wind around 17 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
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 71°F | Light Rain | 17 mph S | 90% |
| Tonight | 52°F | Light Rain | 12 to 16 mph S | 77% |
| Wednesday | 59°F | Chance Rain Showers then Mostly Cloudy | 10 to 15 mph SW | 10% |
| Wednesday Night | 45°F | Mostly Cloudy | 9 mph SW | 1% |
| Thursday | 60°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 | 2% |
| 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 7 mph WNW | 10% |
| Sunday Night | 34°F | Mostly Clear | 5 mph W | 5% |
| Monday | 64°F | Sunny | 2 to 8 mph SW | 1% |
| Monday Night | 39°F | Mostly Clear | 2 to 6 mph WSW | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Forest City, IL
Last spring frost
Apr 17
First fall frost
Oct 19
Growing season
185 days
Hardiness zone
6a
Explore more for Forest City, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Havana, Il (13.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.