Forsyth, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Forsyth, a village in Macon County, Illinois.
Today
86°F
Sunny
Sunny, with a high near 86. South wind around 6 mph.
7-day forecast for Forsyth
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Sunny | 6 mph S | 0% |
| Tonight | 66°F | Mostly Clear | 5 mph SSE | 1% |
| Wednesday | 86°F | Mostly Sunny | 5 to 8 mph SSW | 12% |
| Wednesday Night | 67°F | Chance Showers And Thunderstorms | 7 mph S | 80% |
| Thursday | 81°F | Showers And Thunderstorms | 5 to 8 mph SSW | 80% |
| Thursday Night | 65°F | Slight Chance Showers And Thunderstorms | 2 to 7 mph S | 23% |
| Friday | 83°F | Mostly Sunny | 5 mph SSW | 11% |
| Friday Night | 66°F | Chance Showers And Thunderstorms | 5 mph SSW | 25% |
| Saturday | 85°F | Slight Chance Rain Showers then Mostly Sunny | 3 to 8 mph SSW | 17% |
| Saturday Night | 70°F | Mostly Clear | 6 to 9 mph S | 12% |
| Sunday | 88°F | Sunny | 9 to 15 mph SSW | 7% |
| Sunday Night | 72°F | Mostly Clear | 10 to 14 mph SSW | 11% |
| Monday | 88°F | Mostly Sunny | 13 mph SSW | 13% |
| Monday Night | 72°F | Slight Chance Showers And Thunderstorms | 12 mph SW | 25% |
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 Aug 4, 2026.