Mechanicsburg, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mechanicsburg, a village in Sangamon County, Illinois.
Today
91°F
Mostly Cloudy
Mostly cloudy, with a high near 91. South southwest wind around 7 mph.
7-day forecast for Mechanicsburg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 91°F | Mostly Cloudy | 7 mph SSW | 10% |
| Tonight | 70°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 5 mph SSW | 21% |
| Sunday | 84°F | Chance Showers And Thunderstorms | 3 to 10 mph N | 45% |
| Sunday Night | 61°F | Chance Showers And Thunderstorms | 9 to 13 mph NE | 67% |
| Monday | 71°F | Showers And Thunderstorms Likely | 14 mph NE | 71% |
| Monday Night | 55°F | Chance Rain Showers | 9 to 13 mph NE | 50% |
| Tuesday | 68°F | Slight Chance Rain Showers | 14 mph NE | 21% |
| Tuesday Night | 52°F | Slight Chance Rain Showers then Mostly Cloudy | 6 to 13 mph NNE | 16% |
| Wednesday | 71°F | Mostly Sunny | 10 mph NNE | 2% |
| Wednesday Night | 54°F | Partly Cloudy | 5 to 9 mph NNE | 2% |
| Thursday | 73°F | Mostly Sunny | 5 to 9 mph NNE | 2% |
| Thursday Night | 55°F | Partly Cloudy | 3 to 8 mph NNE | 2% |
| Friday | 75°F | Mostly Sunny | 5 to 9 mph NE | 2% |
| Friday Night | 55°F | Partly Cloudy | 3 to 8 mph NE | 2% |
Forecast source: National Weather Service (api.weather.gov) for Mechanicsburg (39.797, -89.411). Updated through the day.
Growing snapshot for Mechanicsburg
Last spring frost
Apr 15
First fall frost
Oct 22
Growing season
188 days
Hardiness zone
6a
More local growing data for Mechanicsburg: nearby ZIP 62545 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Springfield #2, Il (15.6 mi from Mechanicsburg). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.