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
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| 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
Nearby towns & communities
Anchor
Arrowsmith
Bellflower
Bloomington
Chenoa
Colfax
Cooksville
Danvers
Downs
Ellsworth
Gridley
Heyworth
Hudson
Kappa
Le Roy
Lexington
McLean
Normal
Shirley
Stanford
Towanda
Twin Grove
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.