Green Valley, IL Weather & Growing Conditions
Tonight
69°F
Partly Cloudy then Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms after 5am. Partly cloudy, with a low around 69. Southeast wind around 8 mph, with gusts as high as 17 mph. Chance of precipitation is 20%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 69°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 8 mph SE | 15% |
| Saturday | 89°F | Slight Chance Rain Showers then Mostly Cloudy | 8 mph S | 19% |
| Saturday Night | 68°F | Chance Showers And Thunderstorms | 5 to 8 mph SE | 48% |
| Sunday | 79°F | Rain Showers Likely | 2 to 12 mph NNE | 65% |
| Sunday Night | 59°F | Showers And Thunderstorms Likely | 9 to 13 mph NE | 65% |
| Monday | 68°F | Showers And Thunderstorms Likely | 13 mph ENE | 65% |
| Monday Night | 54°F | Chance Showers And Thunderstorms | 10 to 14 mph NE | 46% |
| Tuesday | 66°F | Chance Rain Showers then Mostly Cloudy | 12 mph NE | 26% |
| Tuesday Night | 51°F | Mostly Cloudy | 5 to 10 mph NNE | 5% |
| Wednesday | 69°F | Mostly Sunny | 8 mph NNE | 4% |
| Wednesday Night | 53°F | Partly Cloudy | 2 to 7 mph NNE | 1% |
| Thursday | 70°F | Mostly Sunny | 6 mph NNE | 3% |
| Thursday Night | 55°F | Partly Cloudy | 5 mph NNE | 3% |
| Friday | 73°F | Mostly Sunny | 2 to 6 mph NNE | 4% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Green Valley, IL
Last spring frost
Apr 17
First fall frost
Oct 18
Growing season
182 days
Hardiness zone
6a
Explore more for Green Valley, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Mason City 4Se, Il (17.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.