Posen, MI Weather & Growing Conditions
Today
66°F
Slight Chance Rain Showers
A slight chance of rain showers. Partly sunny. High near 66, with temperatures falling to around 64 in the afternoon. Southeast wind 5 to 10 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 66°F | Slight Chance Rain Showers | 5 to 10 mph SE | 16% |
| Tonight | 48°F | Slight Chance Rain Showers | 0 to 10 mph E | 24% |
| Sunday | 65°F | Slight Chance Rain Showers then Partly Sunny | 5 to 10 mph NE | 17% |
| Sunday Night | 44°F | Partly Cloudy | 10 mph NE | 0% |
| Monday | 57°F | Partly Sunny | 10 mph NE | 0% |
| Monday Night | 42°F | Mostly Cloudy | 5 to 10 mph NE | 0% |
| Tuesday | 60°F | Mostly Sunny | 5 to 15 mph E | 1% |
| Tuesday Night | 44°F | Partly Cloudy | 5 to 15 mph E | 3% |
| Wednesday | 63°F | Mostly Sunny | 10 to 15 mph E | 10% |
| Wednesday Night | 45°F | Partly Cloudy | 5 to 10 mph E | 10% |
| Thursday | 65°F | Partly Sunny | 5 to 10 mph E | 9% |
| Thursday Night | 45°F | Partly Cloudy | 0 to 10 mph NE | 9% |
| Friday | 68°F | Mostly Sunny | 0 to 10 mph NE | 3% |
| Friday Night | 46°F | Partly Cloudy | 0 to 5 mph NE | 2% |
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 Sep 19, 2026.