Forsyth, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Forsyth, a village in Macon County, Illinois.
This Afternoon
73°F
Slight Chance T-storms
A slight chance of thunderstorms and a slight chance of rain before 2pm, then rain likely and a slight chance of thunderstorms. Mostly cloudy, with a high near 73. South southeast wind 20 to 24 mph, with gusts as high as 37 mph. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Forsyth
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 73°F | Slight Chance T-storms | 20 to 24 mph SSE | 55% |
| Tonight | 54°F | Rain | 16 to 20 mph S | 83% |
| Wednesday | 61°F | Slight Chance Light Rain then Mostly Cloudy | 14 to 17 mph SW | 21% |
| Wednesday Night | 43°F | Mostly Cloudy | 13 mph SW | 1% |
| Thursday | 61°F | Mostly Sunny | 12 to 17 mph WSW | 4% |
| Thursday Night | 41°F | Mostly Cloudy then Slight Chance Light Rain | 5 to 9 mph WNW | 19% |
| Friday | 55°F | Mostly Cloudy | 7 to 13 mph NNW | 14% |
| Friday Night | 35°F | Mostly Cloudy | 3 to 12 mph NNW | 6% |
| Saturday | 54°F | Mostly Sunny | 6 mph NW | 1% |
| Saturday Night | 32°F | Partly Cloudy | 5 mph W | 2% |
| Sunday | 60°F | Sunny | 3 to 12 mph W | 10% |
| Sunday Night | 33°F | Mostly Clear | 5 to 8 mph WNW | 6% |
| Monday | 64°F | Sunny | 5 to 14 mph WSW | 3% |
| Monday Night | 38°F | Mostly Clear | 5 to 9 mph WSW | 2% |
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 Nov 3, 2026.