St. Ignace, MI Weather & Growing Conditions
Overnight
39°F
Partly Cloudy
Partly cloudy. Low around 39, with temperatures rising to around 42 overnight. North wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 39°F | Partly Cloudy | 5 mph N | 0% |
| Saturday | 65°F | Partly Sunny | 5 to 10 mph E | 6% |
| Saturday Night | 42°F | Slight Chance Rain Showers | 5 to 10 mph E | 17% |
| Sunday | 68°F | Mostly Sunny | 5 to 10 mph N | 9% |
| Sunday Night | 40°F | Partly Cloudy | 10 mph NE | 1% |
| Monday | 61°F | Partly Sunny | 10 mph E | 0% |
| Monday Night | 40°F | Partly Cloudy | 5 mph E | 0% |
| Tuesday | 63°F | Sunny | 5 to 10 mph E | 0% |
| Tuesday Night | 43°F | Mostly Clear | 5 to 10 mph E | 1% |
| Wednesday | 63°F | Sunny | 10 to 15 mph E | 6% |
| Wednesday Night | 44°F | Partly Cloudy | 5 to 10 mph E | 6% |
| Thursday | 65°F | Mostly Sunny | 5 to 10 mph E | 4% |
| Thursday Night | 45°F | Partly Cloudy | 5 mph E | 4% |
| Friday | 69°F | Mostly Sunny | 5 mph E | 2% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for St. Ignace, MI
Last spring frost
May 23
First fall frost
Sep 30
Growing season
130 days
Hardiness zone
5b
Explore more for St. Ignace, MI: full frost dates · planting calendar · Michigan frost dates
Climate data from the nearest NOAA station, Moran, Mi (4.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.