Williamsville, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Williamsville, a village in Sangamon County, Illinois.
Today
87°F
Sunny
Sunny, with a high near 87. South southeast wind around 6 mph.
7-day forecast for Williamsville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Sunny | 6 mph SSE | 0% |
| Tonight | 68°F | Mostly Clear | 5 mph SSE | 0% |
| Wednesday | 86°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 to 8 mph S | 21% |
| Wednesday Night | 68°F | Slight Chance Showers And Thunderstorms then Showers And Thunderstorms | 6 mph S | 79% |
| Thursday | 82°F | Showers And Thunderstorms | 6 mph SSW | 79% |
| Thursday Night | 66°F | Slight Chance Showers And Thunderstorms | 1 to 5 mph SSE | 19% |
| Friday | 84°F | Mostly Sunny | 3 mph SSW | 9% |
| Friday Night | 67°F | Slight Chance Showers And Thunderstorms | 2 mph SSW | 21% |
| Saturday | 86°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 3 to 7 mph SSW | 18% |
| Saturday Night | 71°F | Mostly Clear | 7 mph S | 10% |
| Sunday | 89°F | Sunny | 8 to 12 mph SSW | 5% |
| Sunday Night | 73°F | Mostly Clear | 10 mph S | 12% |
| Monday | 90°F | Mostly Sunny | 10 mph SSW | 12% |
| Monday Night | 73°F | Slight Chance Showers And Thunderstorms | 9 mph SSW | 25% |
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 Aug 4, 2026.