Flossmoor, IL Weather & Growing Conditions
Tonight
61°F
Rain Showers
Rain showers. Cloudy. Low around 61, with temperatures rising to around 63 overnight. South wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 61°F | Rain Showers | 15 mph S | 75% |
| Wednesday | 65°F | Rain Showers Likely then Mostly Cloudy | 15 mph SSW | 58% |
| Wednesday Night | 49°F | Mostly Cloudy | 15 mph SW | 10% |
| Thursday | 58°F | Mostly Cloudy then Slight Chance Rain Showers | 10 to 15 mph SW | 17% |
| Thursday Night | 44°F | Chance Rain Showers | 5 to 10 mph WNW | 43% |
| Friday | 54°F | Chance Rain Showers | 10 mph N | 33% |
| Friday Night | 38°F | Slight Chance Rain then Mostly Cloudy | 5 to 10 mph NNW | 16% |
| Saturday | 52°F | Mostly Sunny | 5 mph WNW | 12% |
| Saturday Night | 36°F | Partly Cloudy | 0 to 5 mph WSW | 6% |
| Sunday | 57°F | Mostly Sunny | 5 to 10 mph W | 13% |
| Sunday Night | 37°F | Mostly Clear | 5 to 10 mph W | 10% |
| Monday | 61°F | Sunny | 5 to 10 mph WSW | 7% |
| Monday Night | 41°F | Mostly Clear | 5 to 10 mph WSW | 2% |
| Tuesday | 62°F | Mostly Sunny | 5 to 10 mph W | 1% |
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 Nov 4, 2026.