Algonac, MI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Algonac, a city in St. Clair County, Michigan.
Overnight
58°F
Clear
Clear, with a low around 58. South southeast wind around 1 mph.
7-day forecast for Algonac
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 58°F | Clear | 1 mph SSE | 0% |
| Tuesday | 83°F | Sunny | 1 to 7 mph S | 0% |
| Tuesday Night | 62°F | Mostly Clear | 0 to 7 mph SSE | 0% |
| Wednesday | 86°F | Sunny | 0 to 7 mph SSW | 0% |
| Wednesday Night | 67°F | Partly Cloudy | 1 to 6 mph SSW | 12% |
| Thursday | 83°F | Chance Showers And Thunderstorms | 1 to 7 mph WSW | 48% |
| Thursday Night | 64°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 0 to 5 mph SW | 56% |
| Friday | 84°F | Chance Showers And Thunderstorms | 1 to 5 mph W | 52% |
| Friday Night | 66°F | Chance Showers And Thunderstorms | 3 mph SSW | 43% |
| Saturday | 87°F | Mostly Sunny | 1 to 8 mph SW | 10% |
| Saturday Night | 69°F | Chance Showers And Thunderstorms | 2 to 7 mph SW | 30% |
| Sunday | 88°F | Chance Rain Showers | 2 to 12 mph SW | 30% |
| Sunday Night | 69°F | Chance Showers And Thunderstorms | 5 to 12 mph SW | 44% |
| Monday | 86°F | Chance Rain Showers | 5 to 8 mph WSW | 44% |
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 Aug 4, 2026.