Grass Lake, MI Weather & Growing Conditions
This Afternoon
66°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely before 5pm, then patchy fog and showers and thunderstorms likely. Cloudy. High near 66, with temperatures falling to around 64 in the afternoon. Southeast wind around 8 mph, with gusts as high as 20 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 66°F | Showers And Thunderstorms Likely | 8 mph SE | 74% |
| Tonight | 59°F | Patchy Fog | 2 to 7 mph ESE | 95% |
| Sunday | 68°F | Patchy Fog | 3 to 10 mph NNE | 73% |
| Sunday Night | 50°F | Mostly Cloudy | 10 mph NE | 4% |
| Monday | 62°F | Mostly Cloudy | 12 mph NE | 6% |
| Monday Night | 46°F | Mostly Cloudy | 10 mph NE | 7% |
| Tuesday | 62°F | Partly Sunny | 14 mph NE | 10% |
| Tuesday Night | 49°F | Chance Rain Showers | 14 mph ENE | 42% |
| Wednesday | 61°F | Chance Rain Showers | 13 mph ENE | 54% |
| Wednesday Night | 50°F | Chance Showers And Thunderstorms | 6 to 10 mph NE | 52% |
| Thursday | 64°F | Mostly Cloudy | 8 mph NE | 14% |
| Thursday Night | 49°F | Mostly Cloudy | 3 to 7 mph NE | 8% |
| Friday | 68°F | Mostly Sunny | 5 to 8 mph NNE | 7% |
| Friday Night | 48°F | Partly Cloudy | 2 to 7 mph NE | 5% |
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 Sep 19, 2026.