Williamsville, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Williamsville, a village in Sangamon County, Illinois.
Today
90°F
Chance Showers And Thunderstorms then Mostly Cloudy
A chance of showers and thunderstorms before 11am. Mostly cloudy, with a high near 90. Southwest wind around 7 mph. Chance of precipitation is 30%.
7-day forecast for Williamsville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 90°F | Chance Showers And Thunderstorms then Mostly Cloudy | 7 mph SW | 31% |
| Tonight | 69°F | Partly Cloudy then Chance Showers And Thunderstorms | 5 mph SW | 27% |
| Sunday | 82°F | Chance Showers And Thunderstorms | 3 to 10 mph N | 52% |
| Sunday Night | 61°F | Chance Showers And Thunderstorms | 10 to 14 mph NE | 69% |
| Monday | 69°F | Showers And Thunderstorms Likely | 13 mph NE | 69% |
| Monday Night | 55°F | Chance Rain Showers | 10 to 14 mph NE | 48% |
| Tuesday | 66°F | Slight Chance Rain Showers | 13 mph NE | 23% |
| Tuesday Night | 52°F | Mostly Cloudy | 6 to 13 mph NNE | 12% |
| Wednesday | 70°F | Mostly Sunny | 7 to 10 mph NNE | 2% |
| Wednesday Night | 54°F | Partly Cloudy | 5 to 9 mph NNE | 2% |
| Thursday | 72°F | Mostly Sunny | 5 to 8 mph NNE | 3% |
| Thursday Night | 55°F | Partly Cloudy | 3 to 8 mph NNE | 2% |
| Friday | 75°F | Mostly Sunny | 5 to 8 mph NE | 2% |
| Friday Night | 55°F | Partly Cloudy | 3 to 7 mph NE | 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 19, 2026.