Dorchester, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Dorchester, a village in Macoupin County, Illinois.
Today
86°F
Sunny
Sunny, with a high near 86. South wind around 5 mph.
7-day forecast for Dorchester
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Sunny | 5 mph S | 0% |
| Tonight | 65°F | Mostly Clear | 6 mph SE | 0% |
| Wednesday | 88°F | Sunny | 2 to 6 mph S | 13% |
| Wednesday Night | 68°F | Chance Showers And Thunderstorms | 6 mph S | 75% |
| Thursday | 84°F | Showers And Thunderstorms | 6 mph S | 75% |
| Thursday Night | 66°F | Slight Chance Showers And Thunderstorms | 3 mph SE | 23% |
| Friday | 84°F | Slight Chance Showers And Thunderstorms then Partly Sunny | 3 mph SW | 23% |
| Friday Night | 67°F | Chance Showers And Thunderstorms | 3 mph S | 30% |
| Saturday | 87°F | Chance Showers And Thunderstorms then Mostly Sunny | 5 mph S | 30% |
| Saturday Night | 70°F | Mostly Clear | 6 mph S | 8% |
| Sunday | 89°F | Sunny | 5 to 9 mph S | 6% |
| Sunday Night | 72°F | Mostly Clear | 8 mph S | 5% |
| Monday | 90°F | Mostly Sunny | 6 to 9 mph S | 6% |
| Monday Night | 72°F | Slight Chance Showers And Thunderstorms | 8 mph S | 17% |
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
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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 Aug 4, 2026.