St. Ignace, MI Weather & Growing Conditions
Tonight
41°F
Mostly Cloudy
Mostly cloudy. Low around 41, with temperatures rising to around 44 overnight. Northeast wind 0 to 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 41°F | Mostly Cloudy | 0 to 5 mph NE | 8% |
| Sunday | 68°F | Mostly Sunny | 5 to 10 mph N | 8% |
| Sunday Night | 38°F | Partly Cloudy | 5 to 10 mph NE | 0% |
| Monday | 61°F | Partly Sunny | 5 mph NE | 0% |
| Monday Night | 37°F | Partly Cloudy | 5 mph E | 0% |
| Tuesday | 64°F | Sunny | 5 to 10 mph E | 0% |
| Tuesday Night | 40°F | Mostly Clear | 5 to 10 mph E | 0% |
| Wednesday | 65°F | Sunny | 5 to 10 mph E | 4% |
| Wednesday Night | 41°F | Mostly Clear | 5 to 10 mph E | 4% |
| Thursday | 67°F | Mostly Sunny | 5 to 10 mph E | 3% |
| Thursday Night | 42°F | Partly Cloudy | 0 to 10 mph E | 2% |
| Friday | 71°F | Mostly Sunny | 0 to 5 mph E | 2% |
| Friday Night | 43°F | Partly Cloudy | 0 to 5 mph E | 0% |
| Saturday | 72°F | Mostly Sunny | 0 to 5 mph NE | 1% |
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
5a
Explore more for St. Ignace, MI: full frost dates · planting calendar · Michigan frost dates
Climate data from the nearest NOAA station, Moran, Mi (4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.