St. Ignace, MI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Ignace, a city in Mackinac County, Michigan.
Overnight
41°F
Partly Cloudy
Partly cloudy. Low around 41, with temperatures rising to around 46 overnight. East wind around 5 mph.
7-day forecast for St. Ignace
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 41°F | Partly Cloudy | 5 mph E | 1% |
| Saturday | 65°F | Partly Sunny | 5 to 15 mph E | 9% |
| Saturday Night | 43°F | Slight Chance Rain Showers | 5 to 10 mph E | 18% |
| Sunday | 68°F | Mostly Sunny | 5 to 10 mph N | 11% |
| Sunday Night | 42°F | Partly Cloudy | 10 mph NE | 0% |
| Monday | 61°F | Partly Sunny | 10 mph E | 0% |
| Monday Night | 42°F | Partly Cloudy | 5 to 10 mph E | 0% |
| Tuesday | 63°F | Sunny | 10 to 15 mph E | 0% |
| Tuesday Night | 44°F | Mostly Clear | 10 to 15 mph E | 1% |
| Wednesday | 64°F | Sunny | 10 to 15 mph E | 5% |
| Wednesday Night | 44°F | Partly Cloudy | 5 to 15 mph E | 5% |
| Thursday | 66°F | Mostly Sunny | 5 to 10 mph E | 4% |
| Thursday Night | 44°F | Partly Cloudy | 5 to 10 mph E | 4% |
| Friday | 69°F | Mostly Sunny | 5 mph E | 1% |
Forecast source: National Weather Service (api.weather.gov) for St. Ignace (45.887, -84.732). Updated through the day.
Growing snapshot for St. Ignace
Last spring frost
May 23
First fall frost
Sep 30
Growing season
130 days
Hardiness zone
5b
More local growing data for St. Ignace: nearby ZIP 49781 weather · frost dates · planting calendar · Michigan frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Moran, Mi (4.5 mi from St. Ignace). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.