Saybrook, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Saybrook, a village in Mclean County, Illinois.
This Afternoon
72°F
Chance Light Rain
A chance of rain. Mostly cloudy. High near 72, with temperatures falling to around 67 in the afternoon. South wind around 22 mph, with gusts as high as 33 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Saybrook
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 72°F | Chance Light Rain | 22 mph S | 41% |
| Tonight | 54°F | Light Rain | 16 to 20 mph S | 92% |
| Wednesday | 62°F | Chance Light Rain then Mostly Cloudy | 14 to 17 mph SW | 31% |
| Wednesday Night | 44°F | Mostly Cloudy | 13 mph SW | 5% |
| Thursday | 61°F | Partly Sunny | 12 to 17 mph WSW | 6% |
| Thursday Night | 42°F | Mostly Cloudy then Slight Chance Light Rain | 6 to 9 mph WNW | 23% |
| Friday | 55°F | Slight Chance Light Rain then Partly Sunny | 7 to 13 mph NNW | 19% |
| Friday Night | 34°F | Mostly Cloudy | 5 to 12 mph NNW | 5% |
| Saturday | 54°F | Mostly Sunny | 6 mph NW | 3% |
| Saturday Night | 32°F | Partly Cloudy | 5 mph W | 4% |
| Sunday | 60°F | Sunny | 5 to 10 mph W | 11% |
| Sunday Night | 33°F | Mostly Clear | 5 to 8 mph WNW | 8% |
| Monday | 63°F | Sunny | 5 to 13 mph WSW | 3% |
| Monday Night | 38°F | Mostly Clear | 9 mph WSW | 2% |
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
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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 Nov 4, 2026.