Williamsville, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Williamsville, a village in Sangamon County, Illinois.
Tonight
70°F
Mostly Cloudy
Mostly cloudy, with a low around 70. South southwest wind around 5 mph.
7-day forecast for Williamsville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 70°F | Mostly Cloudy | 5 mph SSW | 10% |
| Sunday | 83°F | Chance Showers And Thunderstorms | 5 to 12 mph N | 31% |
| Sunday Night | 61°F | Chance Showers And Thunderstorms | 8 to 13 mph NE | 57% |
| Monday | 70°F | Showers And Thunderstorms Likely | 12 mph ENE | 66% |
| Monday Night | 56°F | Chance Rain Showers | 8 to 12 mph ENE | 44% |
| Tuesday | 67°F | Chance Rain Showers | 12 mph NE | 43% |
| Tuesday Night | 52°F | Mostly Cloudy | 6 to 12 mph NNE | 6% |
| Wednesday | 69°F | Partly Sunny | 9 mph NNE | 3% |
| Wednesday Night | 54°F | Partly Cloudy | 3 to 9 mph NNE | 0% |
| Thursday | 72°F | Partly Sunny | 3 to 7 mph NNE | 0% |
| Thursday Night | 57°F | Mostly Cloudy | 2 to 6 mph NNE | 9% |
| Friday | 75°F | Slight Chance Rain Showers | 3 to 7 mph NE | 15% |
| Friday Night | 56°F | Partly Cloudy | 6 mph NE | 13% |
| Saturday | 78°F | Mostly Sunny | 2 to 6 mph ENE | 2% |
Forecast source: National Weather Service (api.weather.gov) for Williamsville (39.956, -89.544). Updated through the day.
Growing snapshot for Williamsville
Last spring frost
Apr 14
First fall frost
Oct 20
Growing season
187 days
Hardiness zone
6a
More local growing data for Williamsville: nearby ZIP 62693 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Springfield Capital Ap, Il (11.8 mi from Williamsville). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.