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
67°F
Light Rain Likely
Rain likely. Cloudy. High near 67, with temperatures falling to around 64 in the afternoon. South wind around 15 mph, with gusts as high as 33 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Algonac
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 67°F | Light Rain Likely | 15 mph S | 60% |
| Tonight | 52°F | Light Rain Likely then Mostly Cloudy | 7 to 15 mph SSW | 56% |
| Thursday | 60°F | Mostly Cloudy | 9 to 14 mph SW | 14% |
| Thursday Night | 42°F | Light Rain Likely | 6 to 9 mph WSW | 60% |
| Friday | 53°F | Light Rain Likely | 7 to 10 mph WNW | 56% |
| Friday Night | 36°F | Light Rain Likely | 8 to 12 mph NW | 56% |
| Saturday | 52°F | Chance Light Rain | 12 mph NW | 35% |
| Saturday Night | 32°F | Mostly Cloudy | 3 to 7 mph WNW | 2% |
| Sunday | 57°F | Mostly Sunny | 5 to 10 mph W | 5% |
| Sunday Night | 35°F | Mostly Clear | 6 to 9 mph W | 5% |
| Monday | 57°F | Mostly Sunny | 5 to 9 mph W | 2% |
| Monday Night | 40°F | Partly Cloudy | 8 mph WSW | 1% |
| Tuesday | 60°F | Mostly Sunny | 9 mph W | 1% |
| Tuesday Night | 36°F | Partly Cloudy | 2 to 6 mph WNW | 1% |
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 5, 2026.