Algonac, MI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Algonac, a city in St. Clair County, Michigan.
Tonight
61°F
Mostly Cloudy
Mostly cloudy, with a low around 61. South southeast wind around 9 mph, with gusts as high as 23 mph.
7-day forecast for Algonac
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 61°F | Mostly Cloudy | 9 mph SSE | 2% |
| Wednesday | 67°F | Light Rain | 9 to 15 mph S | 98% |
| Wednesday Night | 53°F | Light Rain then Mostly Cloudy | 7 to 16 mph SSW | 86% |
| Thursday | 61°F | Mostly Cloudy | 9 to 14 mph SW | 12% |
| Thursday Night | 47°F | Chance Light Rain | 2 to 7 mph W | 27% |
| Friday | 57°F | Chance Light Rain | 2 to 8 mph NW | 45% |
| Friday Night | 39°F | Chance Light Rain | 8 mph NW | 44% |
| Saturday | 53°F | Slight Chance Light Rain | 9 mph NW | 21% |
| Saturday Night | 35°F | Mostly Cloudy | 6 mph W | 7% |
| Sunday | 55°F | Mostly Sunny | 3 to 9 mph W | 13% |
| Sunday Night | 36°F | Partly Cloudy | 7 mph WNW | 13% |
| Monday | 57°F | Mostly Sunny | 6 to 10 mph W | 12% |
| Monday Night | 40°F | Partly Cloudy | 8 mph WSW | 11% |
| Tuesday | 59°F | Mostly Sunny | 7 to 10 mph W | 6% |
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 Nov 4, 2026.