Saybrook, IL Weather & Growing Conditions
Overnight
68°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms before 5am. Mostly cloudy, with a low around 68. South southeast wind around 8 mph. Chance of precipitation is 20%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 68°F | Slight Chance Showers And Thunderstorms | 8 mph SSE | 16% |
| Saturday | 86°F | Showers And Thunderstorms Likely | 8 mph SE | 57% |
| Saturday Night | 68°F | Chance Showers And Thunderstorms | 6 mph SSW | 43% |
| Sunday | 75°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 | 65°F | Showers And Thunderstorms Likely | 15 to 18 mph ENE | 67% |
| Monday Night | 52°F | Chance Rain Showers | 13 to 18 mph NE | 50% |
| Tuesday | 64°F | Chance Showers And Thunderstorms | 16 mph NE | 35% |
| Tuesday Night | 50°F | Chance Showers And Thunderstorms then Mostly Cloudy | 9 to 16 mph NNE | 35% |
| Wednesday | 66°F | Mostly Sunny | 13 mph NNE | 6% |
| Wednesday Night | 52°F | Partly Cloudy | 6 to 12 mph NNE | 4% |
| Thursday | 69°F | Partly Sunny | 7 to 10 mph NNE | 3% |
| Thursday Night | 53°F | Partly Cloudy | 6 to 9 mph NNE | 3% |
| Friday | 71°F | Mostly Sunny | 6 to 10 mph NNE | 3% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Saybrook, IL
Last spring frost
Apr 21
First fall frost
Oct 17
Growing season
178 days
Hardiness zone
6a
Explore more for Saybrook, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Gibson City, Il (8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.