Williamsville, IL Weather & Growing Conditions
Today
87°F
Sunny
Sunny, with a high near 87. South wind around 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Sunny | 6 mph S | 0% |
| Tonight | 68°F | Mostly Clear | 5 mph SSE | 0% |
| Wednesday | 86°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 7 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 | 5 to 8 mph S | 10% |
| Sunday | 89°F | Sunny | 8 to 12 mph SSW | 5% |
| Sunday Night | 73°F | Mostly Clear | 10 mph SSW | 12% |
| Monday | 89°F | Mostly Sunny | 8 to 12 mph SSW | 12% |
| Monday Night | 73°F | Slight Chance Showers And Thunderstorms | 9 mph SSW | 25% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Williamsville, IL
Last spring frost
Apr 14
First fall frost
Oct 20
Growing season
187 days
Hardiness zone
6a
Explore more for Williamsville, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Springfield Capital Ap, Il (11.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.