St. Ignace, MI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Ignace, a city in Mackinac County, Michigan.
This Afternoon
66°F
Chance Showers And Thunderstorms
A chance of rain showers before 4pm, then a chance of showers and thunderstorms. Cloudy. High near 66, with temperatures falling to around 62 in the afternoon. Southwest wind around 10 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for St. Ignace
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 66°F | Chance Showers And Thunderstorms | 10 mph SW | 39% |
| Tonight | 56°F | Chance Showers And Thunderstorms | 5 to 10 mph S | 53% |
| Wednesday | 66°F | Rain Showers | 5 to 10 mph SE | 76% |
| Wednesday Night | 47°F | Rain Showers | 5 to 10 mph S | 86% |
| Thursday | 54°F | Rain Showers | 5 to 10 mph SW | 97% |
| Thursday Night | 33°F | Rain Showers | 5 to 15 mph N | 97% |
| Friday | 46°F | Chance Rain Showers | 10 to 15 mph NE | 38% |
| Friday Night | 30°F | Chance Rain Showers then Mostly Cloudy | 5 to 10 mph N | 31% |
| Saturday | 48°F | Mostly Sunny | 5 to 10 mph NW | 6% |
| Saturday Night | 34°F | Partly Cloudy | 5 mph W | 9% |
| Sunday | 50°F | Partly Sunny then Slight Chance Rain Showers | 5 to 15 mph W | 23% |
| Sunday Night | 35°F | Slight Chance Rain Showers then Mostly Cloudy | 10 mph NW | 23% |
| Monday | 52°F | Partly Sunny | 10 to 15 mph W | 7% |
| Monday Night | 37°F | Partly Cloudy | 10 mph W | 6% |
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 Nov 3, 2026.