Mechanicsburg, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mechanicsburg, a village in Sangamon County, Illinois.
Overnight
56°F
Chance Light Rain
A chance of rain. Mostly cloudy, with a low around 56. South southwest wind around 13 mph, with gusts as high as 21 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Mechanicsburg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 56°F | Chance Light Rain | 13 mph SSW | 33% |
| Wednesday | 60°F | Patchy Drizzle | 12 to 15 mph SW | 11% |
| Wednesday Night | 46°F | Patchy Drizzle then Mostly Cloudy | 12 mph WSW | 10% |
| Thursday | 61°F | Partly Sunny | 10 to 15 mph WSW | 8% |
| Thursday Night | 43°F | Mostly Cloudy | 5 to 8 mph NW | 5% |
| Friday | 54°F | Partly Sunny | 12 mph NNW | 4% |
| Friday Night | 33°F | Partly Cloudy | 2 to 9 mph NNW | 0% |
| Saturday | 53°F | Mostly Sunny | 2 to 6 mph NNW | 0% |
| Saturday Night | 32°F | Partly Cloudy | 3 mph NW | 1% |
| Sunday | 58°F | Sunny | 2 to 8 mph WNW | 1% |
| Sunday Night | 34°F | Clear | 1 to 5 mph W | 1% |
| Monday | 63°F | Sunny | 1 to 7 mph SW | 0% |
| Monday Night | 39°F | Clear | 2 to 6 mph SW | 0% |
| Tuesday | 66°F | Sunny | 5 mph WNW | 1% |
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 Nov 4, 2026.