St. Ignace, MI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Ignace, a city in Mackinac County, Michigan.
Today
81°F
Sunny
Sunny. High near 81, with temperatures falling to around 79 in the afternoon. Southwest wind 10 to 15 mph, with gusts as high as 30 mph.
7-day forecast for St. Ignace
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 81°F | Sunny | 10 to 15 mph SW | 3% |
| Tonight | 59°F | Showers And Thunderstorms Likely | 5 to 15 mph NW | 69% |
| Wednesday | 77°F | Chance Showers And Thunderstorms then Partly Sunny | 5 mph N | 53% |
| Wednesday Night | 57°F | Mostly Cloudy | 0 to 5 mph N | 8% |
| Thursday | 79°F | Mostly Sunny | 0 to 5 mph SE | 8% |
| Thursday Night | 61°F | Mostly Clear | 5 mph S | 3% |
| Friday | 81°F | Sunny | 5 to 10 mph SW | 0% |
| Friday Night | 65°F | Mostly Clear | 5 to 10 mph SW | 14% |
| Saturday | 80°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 10 to 15 mph SW | 18% |
| Saturday Night | 62°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 37% |
| Sunday | 80°F | Chance Showers And Thunderstorms | 5 to 10 mph W | 40% |
| Sunday Night | 59°F | Chance Showers And Thunderstorms | 5 to 10 mph W | 39% |
| Monday | 78°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 5 to 10 mph W | 17% |
| Monday Night | 57°F | Chance Showers And Thunderstorms | 5 to 10 mph NW | 29% |
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 Aug 4, 2026.