Dorchester, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Dorchester, a village in Macoupin County, Illinois.
Overnight
53°F
Chance Light Rain
A chance of rain before 4am, then a slight chance of drizzle. Mostly cloudy, with a low around 53. Southwest wind around 13 mph, with gusts as high as 23 mph. Chance of precipitation is 50%.
7-day forecast for Dorchester
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 53°F | Chance Light Rain | 13 mph SW | 49% |
| Wednesday | 61°F | Slight Chance Drizzle then Mostly Cloudy | 8 to 14 mph W | 12% |
| Wednesday Night | 42°F | Partly Cloudy | 7 mph SW | 1% |
| Thursday | 62°F | Sunny | 6 to 12 mph W | 1% |
| Thursday Night | 41°F | Mostly Cloudy | 6 mph NW | 10% |
| Friday | 57°F | Mostly Cloudy | 6 to 10 mph NW | 5% |
| Friday Night | 36°F | Partly Cloudy | 2 to 6 mph N | 2% |
| Saturday | 55°F | Mostly Sunny | 3 mph NW | 1% |
| Saturday Night | 33°F | Partly Cloudy | 2 mph NW | 1% |
| Sunday | 61°F | Sunny | 2 to 7 mph W | 7% |
| Sunday Night | 33°F | Mostly Clear | 5 mph W | 4% |
| Monday | 64°F | Sunny | 2 to 8 mph SW | 2% |
| Monday Night | 38°F | Mostly Clear | 5 mph SW | 1% |
| Tuesday | 67°F | Sunny | 6 mph W | 0% |
Forecast source: National Weather Service (api.weather.gov) for Dorchester (39.086, -89.888). Updated through the day.
Growing snapshot for Dorchester
Last spring frost
Apr 14
First fall frost
Oct 21
Growing season
188 days
Hardiness zone
6b
More local growing data for Dorchester: nearby ZIP 62093 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Benld
Bunker Hill
Carlinville
Chesterfield
Eagarville
East Gillespie
Gillespie
Girard
Hettick
Lake Ka-Ho
Modesto
Mount Clare
Mount Olive
Nilwood
Palmyra
Royal Lakes
Sawyerville
Scottville
Shipman
Standard City
Staunton
Virden
White City
Wilsonville
Climate data from the nearest NOAA station, Carlinville, Il (15.5 mi from Dorchester). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.