Posen, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Posen, a village in Cook County, Illinois.
This Afternoon
71°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Cloudy, with a high near 71. East northeast wind around 5 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Posen
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 71°F | Chance Showers And Thunderstorms | 5 mph ENE | 47% |
| Tonight | 66°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 mph SE | 100% |
| Sunday | 68°F | Showers And Thunderstorms | 5 to 15 mph NNE | 84% |
| Sunday Night | 58°F | Chance Rain Showers | 15 mph NE | 39% |
| Monday | 65°F | Chance Rain Showers | 15 mph ENE | 40% |
| Monday Night | 55°F | Chance Rain Showers | 10 to 15 mph ENE | 29% |
| Tuesday | 63°F | Chance Rain Showers | 10 to 15 mph NE | 29% |
| Tuesday Night | 55°F | Chance Rain Showers then Mostly Cloudy | 5 to 15 mph NE | 25% |
| Wednesday | 64°F | Partly Sunny | 10 mph NE | 14% |
| Wednesday Night | 55°F | Mostly Cloudy | 5 to 10 mph NE | 7% |
| Thursday | 67°F | Partly Sunny | 5 to 10 mph NE | 2% |
| Thursday Night | 56°F | Mostly Cloudy | 0 to 5 mph NE | 8% |
| Friday | 71°F | Partly Sunny | 0 to 5 mph NE | 8% |
| Friday Night | 57°F | Partly Cloudy | 0 to 5 mph NE | 2% |
Forecast source: National Weather Service (api.weather.gov) for Posen (41.629, -87.686). Updated through the day.
Growing snapshot for Posen
Last spring frost
Apr 10
First fall frost
Nov 1
Growing season
203 days
Hardiness zone
6a
More local growing data for Posen: nearby ZIP 60469 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Chicago Midway Ap 3Sw, Il (8.8 mi from Posen). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.