Posen, MI Weather & Growing Conditions
Tonight
57°F
Mostly Cloudy
Mostly cloudy. Low around 57, with temperatures rising to around 59 overnight. South wind 5 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 57°F | Mostly Cloudy | 5 to 10 mph S | 14% |
| Wednesday | 69°F | Rain Showers Likely | 5 to 15 mph S | 56% |
| Wednesday Night | 49°F | Chance Rain Showers then Mostly Cloudy | 5 to 10 mph S | 49% |
| Thursday | 56°F | Rain Showers | 5 to 10 mph SW | 86% |
| Thursday Night | 38°F | Rain Showers | 0 to 15 mph NW | 94% |
| Friday | 46°F | Rain Showers | 10 to 15 mph N | 80% |
| Friday Night | 34°F | Chance Rain Showers | 5 to 10 mph N | 48% |
| Saturday | 49°F | Partly Sunny | 5 to 10 mph NW | 11% |
| Saturday Night | 31°F | Partly Cloudy | 5 mph W | 7% |
| Sunday | 53°F | Partly Sunny then Slight Chance Rain Showers | 5 to 10 mph W | 19% |
| Sunday Night | 35°F | Slight Chance Rain Showers then Mostly Cloudy | 5 to 10 mph NW | 19% |
| Monday | 55°F | Partly Sunny | 5 to 10 mph W | 9% |
| Monday Night | 37°F | Mostly Cloudy | 5 to 10 mph W | 9% |
| Tuesday | 54°F | Partly Sunny | 10 to 15 mph W | 11% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Posen, MI
Last spring frost
May 13
First fall frost
Oct 3
Growing season
141 days
Hardiness zone
5b
Explore more for Posen, MI: full frost dates · planting calendar · Michigan frost dates
Climate data from the nearest NOAA station, Alpena 10Nw, Mi (6.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.