Dorchester, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Dorchester, a village in Macoupin County, Illinois.
Tonight
69°F
Partly Cloudy
Partly cloudy, with a low around 69. Southeast wind around 8 mph.
7-day forecast for Dorchester
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 69°F | Partly Cloudy | 8 mph SE | 13% |
| Saturday | 95°F | Mostly Sunny | 5 to 8 mph SW | 6% |
| Saturday Night | 70°F | Partly Cloudy | 5 mph SW | 6% |
| Sunday | 91°F | Chance Rain Showers then Chance Showers And Thunderstorms | 2 to 7 mph NW | 30% |
| Sunday Night | 63°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 6 to 9 mph N | 62% |
| Monday | 77°F | Showers And Thunderstorms Likely | 7 to 12 mph NE | 63% |
| Monday Night | 57°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 7 to 13 mph NE | 63% |
| Tuesday | 70°F | Slight Chance Rain Showers then Mostly Cloudy | 9 to 13 mph NE | 24% |
| Tuesday Night | 51°F | Mostly Cloudy | 5 to 12 mph N | 4% |
| Wednesday | 73°F | Mostly Sunny | 6 to 9 mph N | 2% |
| Wednesday Night | 52°F | Partly Cloudy | 2 to 8 mph N | 2% |
| Thursday | 74°F | Mostly Sunny | 3 to 7 mph N | 4% |
| Thursday Night | 55°F | Partly Cloudy | 2 to 6 mph NE | 3% |
| Friday | 75°F | Mostly Sunny | 3 to 7 mph NE | 5% |
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
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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 Sep 19, 2026.