Williamsville, IL Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Williamsville, a village in Sangamon County, Illinois.

Overnight

56°F

Mostly Cloudy

Mostly cloudy, with a low around 56. South southwest wind around 12 mph, with gusts as high as 21 mph. New rainfall amounts less than a tenth of an inch possible.

7-day forecast for Williamsville

When	Temp	Forecast	Wind	Precip
Overnight	56°F	Mostly Cloudy	12 mph SSW	13%
Wednesday	59°F	Slight Chance Drizzle	12 to 15 mph SW	11%
Wednesday Night	43°F	Slight Chance Drizzle then Mostly Cloudy	12 mph WSW	10%
Thursday	61°F	Mostly Cloudy	10 to 14 mph W	11%
Thursday Night	44°F	Mostly Cloudy	5 to 8 mph NW	10%
Friday	53°F	Partly Sunny	12 mph NNW	4%
Friday Night	33°F	Partly Cloudy	2 to 8 mph NNW	0%
Saturday	53°F	Sunny	2 to 6 mph NNW	0%
Saturday Night	33°F	Partly Cloudy	2 mph WNW	1%
Sunday	58°F	Sunny	2 to 8 mph WNW	1%
Sunday Night	34°F	Clear	1 to 5 mph W	1%
Monday	64°F	Sunny	1 to 7 mph SW	0%
Monday Night	39°F	Clear	5 mph SW	0%
Tuesday	66°F	Sunny	5 mph WNW	1%

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

More local growing data for Williamsville: nearby ZIP 62693 weather · frost dates · planting calendar · Illinois frost dates

Nearby towns & communities

Auburn Berlin Buffalo Cantrall Chatham Curran Dawson Divernon Grandview Illiopolis Jerome Leland Grove Loami Mechanicsburg New Berlin Pawnee Pleasant Plains Riverton Rochester Sherman Southern View Spaulding Springfield Thayer

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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 Nov 4, 2026.