Port Sanilac, MI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Port Sanilac, a village in Sanilac County, Michigan.
This Afternoon
65°F
Slight Chance Rain Showers
A slight chance of rain showers. Cloudy, with a high near 65. Southeast wind around 12 mph, with gusts as high as 18 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Port Sanilac
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 65°F | Slight Chance Rain Showers | 12 mph SE | 16% |
| Tonight | 57°F | Chance Rain Showers | 7 to 12 mph ESE | 50% |
| Sunday | 64°F | Chance Rain Showers then Mostly Cloudy | 8 to 20 mph NE | 25% |
| Sunday Night | 53°F | Mostly Cloudy | 15 to 21 mph NE | 0% |
| Monday | 61°F | Mostly Cloudy | 15 mph NE | 0% |
| Monday Night | 52°F | Mostly Cloudy | 16 mph ENE | 1% |
| Tuesday | 62°F | Partly Sunny | 14 to 17 mph ENE | 3% |
| Tuesday Night | 54°F | Mostly Cloudy then Slight Chance Rain Showers | 17 to 21 mph E | 19% |
| Wednesday | 62°F | Slight Chance Rain Showers | 18 mph E | 21% |
| Wednesday Night | 54°F | Slight Chance Rain Showers | 13 to 21 mph E | 22% |
| Thursday | 63°F | Slight Chance Rain Showers then Partly Sunny | 14 mph E | 22% |
| Thursday Night | 55°F | Partly Cloudy | 7 to 12 mph E | 13% |
| Friday | 65°F | Mostly Sunny | 7 to 10 mph NE | 12% |
| Friday Night | 56°F | Partly Cloudy | 7 to 10 mph NE | 5% |
Forecast source: National Weather Service (api.weather.gov) for Port Sanilac (43.428, -82.545). Updated through the day.
Growing snapshot for Port Sanilac
Last spring frost
May 4
First fall frost
Oct 24
Growing season
171 days
Hardiness zone
6a
More local growing data for Port Sanilac: nearby ZIP 48469 weather · frost dates · planting calendar · Michigan frost dates
Nearby towns & communities
Applegate
Brown City
Carsonville
Croswell
Deckerville
Forestville
Lexington
Marlette
Melvin
Minden City
Peck
Sandusky
Snover
Ubly
Climate data from the nearest NOAA station, Lexington Wtp, Mi (12.4 mi from Port Sanilac). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.