Forreston, IL Weather & Growing Conditions
Tonight
54°F
Rain
Rain. Cloudy. Low around 54, with temperatures rising to around 58 overnight. South wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 54°F | Rain | 15 mph S | 82% |
| Wednesday | 58°F | Chance Rain then Chance Rain Showers | 15 mph SSW | 44% |
| Wednesday Night | 45°F | Chance Rain Showers | 15 mph SW | 30% |
| Thursday | 54°F | Chance Rain Showers | 10 to 15 mph WSW | 54% |
| Thursday Night | 40°F | Chance Rain Showers | 5 to 10 mph NNW | 28% |
| Friday | 50°F | Partly Sunny | 10 to 15 mph N | 14% |
| Friday Night | 31°F | Partly Cloudy | 0 to 5 mph NNW | 1% |
| Saturday | 52°F | Mostly Sunny | 0 to 5 mph WNW | 2% |
| Saturday Night | 32°F | Partly Cloudy | 0 to 5 mph W | 4% |
| Sunday | 58°F | Mostly Sunny | 5 to 10 mph W | 13% |
| Sunday Night | 33°F | Mostly Clear | 5 mph WSW | 4% |
| Monday | 60°F | Sunny | 5 to 15 mph SW | 1% |
| Monday Night | 38°F | Mostly Clear | 5 to 10 mph W | 0% |
| Tuesday | 61°F | Sunny | 5 to 10 mph WNW | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Forreston, IL
Last spring frost
Apr 29
First fall frost
Oct 7
Growing season
161 days
Hardiness zone
5b
Explore more for Forreston, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Polo 5Nw, Il (5.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.