Green Valley, IL Weather & Growing Conditions
Overnight
56°F
Chance Light Rain
A chance of rain before 5am. Mostly cloudy, with a low around 56. South southwest wind around 13 mph, with gusts as high as 22 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 56°F | Chance Light Rain | 13 mph SSW | 33% |
| Wednesday | 59°F | Patchy Drizzle | 14 mph SW | 11% |
| Wednesday Night | 46°F | Patchy Drizzle then Mostly Cloudy | 12 mph SW | 10% |
| Thursday | 59°F | Mostly Cloudy then Slight Chance Light Rain | 10 to 14 mph W | 17% |
| Thursday Night | 42°F | Slight Chance Light Rain then Mostly Cloudy | 8 mph NW | 23% |
| Friday | 53°F | Partly Sunny | 10 mph N | 5% |
| Friday Night | 32°F | Partly Cloudy | 1 to 7 mph NNW | 0% |
| Saturday | 53°F | Sunny | 1 to 5 mph NW | 0% |
| Saturday Night | 32°F | Mostly Clear | 2 mph WNW | 1% |
| Sunday | 59°F | Sunny | 1 to 7 mph W | 1% |
| Sunday Night | 34°F | Clear | 3 mph W | 1% |
| Monday | 64°F | Sunny | 1 to 7 mph SW | 0% |
| Monday Night | 38°F | Mostly Clear | 5 mph WSW | 0% |
| Tuesday | 66°F | Sunny | 5 mph WNW | 1% |
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 Nov 4, 2026.