Flossmoor, IL Weather & Growing Conditions
Today
85°F
Mostly Sunny
Mostly sunny, with a high near 85. South southwest wind 5 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Mostly Sunny | 5 to 10 mph SSW | 2% |
| Tonight | 66°F | Partly Cloudy | 5 mph SSW | 4% |
| Wednesday | 82°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 5 mph SSW | 45% |
| Wednesday Night | 66°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 0 to 5 mph WSW | 88% |
| Thursday | 79°F | Showers And Thunderstorms Likely | 0 to 5 mph S | 88% |
| Thursday Night | 63°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph SE | 46% |
| Friday | 82°F | Mostly Sunny | 0 to 5 mph SSW | 6% |
| Friday Night | 65°F | Partly Cloudy | 0 to 5 mph SSW | 8% |
| Saturday | 85°F | Mostly Sunny | 5 mph SSW | 10% |
| Saturday Night | 69°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 5 mph SSW | 15% |
| Sunday | 87°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 5 to 15 mph SW | 15% |
| Sunday Night | 71°F | Chance Showers And Thunderstorms | 5 to 10 mph SSW | 40% |
| Monday | 86°F | Chance Rain Showers | 5 to 10 mph SW | 40% |
| Monday Night | 70°F | Chance Showers And Thunderstorms | 5 to 10 mph WSW | 45% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Flossmoor, IL
Last spring frost
Apr 23
First fall frost
Oct 20
Growing season
179 days
Hardiness zone
6a
Explore more for Flossmoor, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Park Forest, Il (3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.