Port Sanilac, MI Weather & Growing Conditions
Tonight
55°F
Light Rain Likely
Rain likely. Mostly cloudy. Low around 55, with temperatures rising to around 57 overnight. East northeast wind 7 to 10 mph. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 55°F | Light Rain Likely | 7 to 10 mph ENE | 61% |
| Saturday | 65°F | Slight Chance Light Rain then Chance Rain Showers | 7 to 12 mph SE | 48% |
| Saturday Night | 56°F | Rain Showers Likely | 8 to 12 mph E | 63% |
| Sunday | 65°F | Chance Rain Showers | 9 to 18 mph NE | 27% |
| Sunday Night | 54°F | Slight Chance Rain Showers then Mostly Cloudy | 15 to 18 mph NE | 20% |
| Monday | 62°F | Mostly Cloudy | 17 mph NE | 2% |
| Monday Night | 53°F | Mostly Cloudy | 15 to 20 mph ENE | 5% |
| Tuesday | 62°F | Partly Sunny then Slight Chance Rain Showers | 18 mph ENE | 16% |
| Tuesday Night | 54°F | Chance Rain Showers | 16 to 22 mph ENE | 42% |
| Wednesday | 63°F | Chance Rain Showers | 17 mph E | 46% |
| Wednesday Night | 55°F | Chance Showers And Thunderstorms | 10 to 17 mph E | 43% |
| Thursday | 65°F | Slight Chance Showers And Thunderstorms | 13 mph ENE | 19% |
| Thursday Night | 55°F | Mostly Cloudy | 8 to 12 mph NE | 14% |
| Friday | 66°F | Mostly Sunny | 8 to 12 mph NNE | 9% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Port Sanilac, MI
Last spring frost
May 4
First fall frost
Oct 24
Growing season
171 days
Hardiness zone
6a
Explore more for Port Sanilac, MI: full frost dates · planting calendar · Michigan frost dates
Climate data from the nearest NOAA station, Lexington Wtp, Mi (12.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.