Saybrook, IL Weather & Growing Conditions

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

Today

83°F

Mostly Sunny

Mostly sunny, with a high near 83. South southwest wind around 6 mph.

7-day forecast for Saybrook

When	Temp	Forecast	Wind	Precip
Today	83°F	Mostly Sunny	6 mph SSW	0%
Tonight	66°F	Partly Cloudy	6 mph SSE	1%
Wednesday	84°F	Mostly Sunny then Slight Chance Showers And Thunderstorms	5 to 8 mph SSW	20%
Wednesday Night	66°F	Showers And Thunderstorms	6 mph S	81%
Thursday	80°F	Showers And Thunderstorms	6 mph SSW	81%
Thursday Night	64°F	Slight Chance Showers And Thunderstorms	5 mph S	23%
Friday	82°F	Mostly Sunny	3 mph S	11%
Friday Night	65°F	Slight Chance Showers And Thunderstorms	5 mph S	24%
Saturday	84°F	Mostly Sunny	7 mph SSW	14%
Saturday Night	69°F	Mostly Clear	5 to 10 mph SSW	13%
Sunday	86°F	Sunny	10 to 14 mph SSW	9%
Sunday Night	70°F	Partly Cloudy then Slight Chance Showers And Thunderstorms	13 mph SSW	15%
Monday	87°F	Slight Chance Showers And Thunderstorms	12 mph SSW	17%
Monday Night	70°F	Slight Chance Showers And Thunderstorms	12 mph SW	30%

Forecast source: National Weather Service (api.weather.gov) for Saybrook (40.428, -88.526). Updated through the day.

Growing snapshot for Saybrook

Last spring frost

Apr 21

First fall frost

Oct 17

Growing season

178 days

Hardiness zone

More local growing data for Saybrook: nearby ZIP 61770 weather · frost dates · planting calendar · Illinois frost dates

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Climate data from the nearest NOAA station, Gibson City, Il (8 mi from Saybrook). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.