Mechanicsburg, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mechanicsburg, a village in Sangamon County, Illinois.
This Afternoon
89°F
Slight Chance Rain Showers
A slight chance of rain showers between 4pm and 5pm. Cloudy, with a high near 89. Southwest wind around 6 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Mechanicsburg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 89°F | Slight Chance Rain Showers | 6 mph SW | 17% |
| Tonight | 70°F | Mostly Cloudy | 6 mph SSW | 7% |
| Sunday | 85°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 5 to 12 mph N | 32% |
| Sunday Night | 61°F | Chance Showers And Thunderstorms | 8 to 13 mph NE | 58% |
| Monday | 72°F | Showers And Thunderstorms Likely | 9 to 13 mph ENE | 64% |
| Monday Night | 56°F | Chance Rain Showers | 8 to 12 mph ENE | 43% |
| Tuesday | 68°F | Chance Rain Showers | 13 mph NE | 43% |
| Tuesday Night | 53°F | Mostly Cloudy | 6 to 13 mph NNE | 6% |
| Wednesday | 69°F | Partly Sunny | 7 to 10 mph NNE | 3% |
| Wednesday Night | 54°F | Mostly Cloudy | 3 to 9 mph NNE | 0% |
| Thursday | 73°F | Partly Sunny | 3 to 7 mph NNE | 0% |
| Thursday Night | 57°F | Mostly Cloudy | 2 to 7 mph NNE | 9% |
| Friday | 76°F | Slight Chance Rain Showers | 3 to 7 mph NE | 15% |
| Friday Night | 56°F | Slight Chance Rain Showers then Partly Cloudy | 6 mph NE | 15% |
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.