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Saybrook, IL Weather & Growing Conditions

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

Tonight
66°F
Mostly Cloudy
Mostly cloudy, with a low around 66. East southeast wind around 9 mph, with gusts as high as 17 mph.

7-day forecast for Saybrook

WhenTempForecastWindPrecip
Tonight 66°F Mostly Cloudy 9 mph ESE 8%
Saturday 85°F Chance Showers And Thunderstorms 10 mph S 31%
Saturday Night 67°F Slight Chance Showers And Thunderstorms 8 mph SSW 43%
Sunday 79°F Showers And Thunderstorms Likely 5 to 14 mph NNE 66%
Sunday Night 58°F Showers And Thunderstorms Likely then Chance Showers And Thunderstorms 12 to 16 mph NE 66%
Monday 67°F Showers And Thunderstorms Likely 14 to 17 mph ENE 69%
Monday Night 53°F Chance Showers And Thunderstorms 13 to 17 mph NE 52%
Tuesday 65°F Chance Rain Showers 16 mph NE 25%
Tuesday Night 51°F Mostly Cloudy 8 to 15 mph NNE 9%
Wednesday 68°F Partly Sunny 12 mph NNE 5%
Wednesday Night 52°F Partly Cloudy 6 to 12 mph NNE 5%
Thursday 70°F Mostly Sunny 6 to 9 mph N 4%
Thursday Night 53°F Partly Cloudy 5 to 8 mph NNE 3%
Friday 72°F Mostly Sunny 6 to 9 mph NNE 4%

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
6a

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 Sep 19, 2026.