Saybrook, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Saybrook, a village in Mclean County, Illinois.
Today
86°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely before 1pm. Mostly cloudy, with a high near 86. Southeast wind around 7 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Saybrook
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Showers And Thunderstorms Likely | 7 mph SE | 55% |
| Tonight | 68°F | Chance Showers And Thunderstorms | 7 mph SSW | 43% |
| Sunday | 76°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 to 15 mph N | 70% |
| Sunday Night | 57°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 16 mph NE | 61% |
| Monday | 66°F | Showers And Thunderstorms Likely | 18 mph ENE | 68% |
| Monday Night | 52°F | Chance Rain Showers | 13 to 18 mph NE | 50% |
| Tuesday | 64°F | Chance Showers And Thunderstorms | 16 mph NE | 36% |
| Tuesday Night | 50°F | Chance Showers And Thunderstorms then Mostly Cloudy | 9 to 16 mph NNE | 36% |
| Wednesday | 67°F | Mostly Sunny | 13 mph NNE | 5% |
| Wednesday Night | 52°F | Partly Cloudy | 7 to 12 mph NNE | 4% |
| Thursday | 69°F | Partly Sunny | 7 to 10 mph NNE | 3% |
| Thursday Night | 53°F | Partly Cloudy | 6 to 10 mph NNE | 3% |
| Friday | 72°F | Mostly Sunny | 6 to 10 mph NNE | 3% |
| Friday Night | 53°F | Partly Cloudy | 6 to 9 mph NE | 3% |
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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McLean
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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.