Forsyth, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Forsyth, a village in Macon County, Illinois.
Tonight
70°F
Partly Cloudy
Partly cloudy, with a low around 70. East southeast wind around 9 mph, with gusts as high as 17 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Forsyth
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 70°F | Partly Cloudy | 9 mph ESE | 4% |
| Saturday | 90°F | Slight Chance Showers And Thunderstorms | 9 mph SSW | 19% |
| Saturday Night | 69°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 8 mph SSW | 23% |
| Sunday | 85°F | Chance Showers And Thunderstorms | 5 to 14 mph N | 51% |
| Sunday Night | 60°F | Chance Showers And Thunderstorms | 13 to 16 mph NE | 67% |
| Monday | 71°F | Showers And Thunderstorms Likely | 17 mph NE | 67% |
| Monday Night | 54°F | Showers And Thunderstorms Likely | 14 to 18 mph NE | 62% |
| Tuesday | 68°F | Chance Rain Showers | 17 mph NE | 35% |
| Tuesday Night | 52°F | Mostly Cloudy | 8 to 16 mph NNE | 7% |
| Wednesday | 70°F | Partly Sunny | 13 mph NNE | 2% |
| Wednesday Night | 53°F | Partly Cloudy | 5 to 13 mph NNE | 2% |
| Thursday | 71°F | Mostly Sunny | 6 to 12 mph NNE | 3% |
| Thursday Night | 54°F | Partly Cloudy | 5 to 10 mph NNE | 5% |
| Friday | 74°F | Mostly Sunny | 6 to 12 mph NNE | 5% |
Forecast source: National Weather Service (api.weather.gov) for Forsyth (39.926, -88.964). Updated through the day.
Growing snapshot for Forsyth
Last spring frost
Apr 14
First fall frost
Oct 24
Growing season
192 days
Hardiness zone
6a
More local growing data for Forsyth: nearby ZIP 62535 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Argenta
Boody
Dalton City
Decatur
Elwin
Harristown
Long Creek
Macon
Maroa
Mount Zion
Niantic
Oreana
Warrensburg
Climate data from the nearest NOAA station, Decatur Wtp, Il (6.7 mi from Forsyth). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.