Grass Lake, MI Weather & Growing Conditions
Tonight
61°F
Partly Cloudy then Slight Chance Rain Showers
A slight chance of rain showers after 5am. Partly cloudy. Low around 61, with temperatures rising to around 63 overnight. South southeast wind around 14 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 61°F | Partly Cloudy then Slight Chance Rain Showers | 14 mph SSE | 16% |
| Wednesday | 68°F | Rain Showers | 12 to 17 mph S | 88% |
| Wednesday Night | 47°F | Chance Rain Showers then Mostly Cloudy | 8 to 12 mph SW | 54% |
| Thursday | 59°F | Mostly Cloudy | 9 to 16 mph SW | 11% |
| Thursday Night | 40°F | Chance Rain Showers | 5 to 8 mph W | 54% |
| Friday | 51°F | Rain Showers Likely | 7 to 10 mph NW | 55% |
| Friday Night | 32°F | Rain Showers Likely | 10 mph NW | 55% |
| Saturday | 50°F | Partly Sunny | 7 to 10 mph NW | 12% |
| Saturday Night | 29°F | Partly Cloudy | 5 mph WNW | 2% |
| Sunday | 55°F | Mostly Sunny | 6 to 12 mph W | 8% |
| Sunday Night | 31°F | Partly Cloudy | 5 to 9 mph W | 8% |
| Monday | 58°F | Sunny | 5 to 9 mph W | 1% |
| Monday Night | 36°F | Partly Cloudy | 8 mph WSW | 1% |
| Tuesday | 61°F | Mostly Sunny | 8 to 12 mph W | 2% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Grass Lake, MI
Last spring frost
Apr 30
First fall frost
Oct 12
Growing season
163 days
Hardiness zone
6a
Explore more for Grass Lake, MI: full frost dates · planting calendar · Michigan frost dates
Climate data from the nearest NOAA station, Chelsea, Mi (9.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.