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
83°F
Sunny
Sunny, with a high near 83. South wind around 12 mph.
7-day forecast for Port Sanilac
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 83°F | Sunny | 12 mph S | 0% |
| Tonight | 63°F | Mostly Clear | 8 to 12 mph S | 0% |
| Wednesday | 85°F | Sunny | 8 mph SSW | 0% |
| Wednesday Night | 66°F | Slight Chance Showers And Thunderstorms | 7 mph WNW | 56% |
| Thursday | 77°F | Rain Showers | 8 mph WNW | 75% |
| Thursday Night | 64°F | Showers And Thunderstorms Likely | 3 to 7 mph N | 61% |
| Friday | 81°F | Chance Showers And Thunderstorms | 3 to 7 mph S | 31% |
| Friday Night | 66°F | Chance Showers And Thunderstorms then Partly Cloudy | 6 mph SSE | 31% |
| Saturday | 83°F | Sunny | 6 to 9 mph SW | 11% |
| Saturday Night | 68°F | Chance Showers And Thunderstorms | 8 mph SSW | 32% |
| Sunday | 84°F | Chance Rain Showers | 7 to 14 mph SW | 33% |
| Sunday Night | 68°F | Chance Showers And Thunderstorms | 10 mph W | 46% |
| Monday | 80°F | Chance Rain Showers | 10 mph WSW | 46% |
| Monday Night | 66°F | Chance Showers And Thunderstorms | 8 mph WSW | 50% |
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 Aug 4, 2026.