Algonac, MI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Algonac, a city in St. Clair County, Michigan.
This Afternoon
72°F
Partly Sunny
Partly sunny. High near 72, with temperatures falling to around 68 in the afternoon. North northeast wind around 10 mph, with gusts as high as 20 mph.
7-day forecast for Algonac
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 72°F | Partly Sunny | 10 mph NNE | 1% |
| Tonight | 54°F | Mostly Cloudy | 3 to 10 mph NE | 7% |
| Saturday | 69°F | Rain Showers Likely | 3 to 8 mph E | 70% |
| Saturday Night | 55°F | Chance Showers And Thunderstorms | 3 to 7 mph E | 80% |
| Sunday | 68°F | Chance Rain Showers | 5 to 13 mph NNE | 47% |
| Sunday Night | 50°F | Chance Rain Showers then Mostly Cloudy | 7 to 12 mph NE | 34% |
| Monday | 66°F | Mostly Cloudy | 8 to 12 mph NE | 8% |
| Monday Night | 48°F | Cloudy | 10 mph NE | 11% |
| Tuesday | 65°F | Slight Chance Rain Showers | 13 mph NE | 18% |
| Tuesday Night | 51°F | Chance Rain Showers | 9 to 13 mph ENE | 48% |
| Wednesday | 65°F | Chance Rain Showers | 12 mph ENE | 53% |
| Wednesday Night | 52°F | Chance Showers And Thunderstorms | 6 to 9 mph ENE | 53% |
| Thursday | 67°F | Slight Chance Showers And Thunderstorms | 8 mph ENE | 24% |
| Thursday Night | 52°F | Mostly Cloudy | 3 to 7 mph NE | 14% |
Forecast source: National Weather Service (api.weather.gov) for Algonac (42.621, -82.534). Updated through the day.
Growing snapshot for Algonac
Last spring frost
May 3
First fall frost
Oct 18
Growing season
167 days
Hardiness zone
6b
More local growing data for Algonac: nearby ZIP 48001 weather · frost dates · planting calendar · Michigan frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Algonac Wwtp, Mi (2.5 mi from Algonac). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 18, 2026.