South Lyon, MI Weather & Growing Conditions
Tonight
54°F
Mostly Cloudy then Chance Light Rain
A chance of rain after midnight. Mostly cloudy. Low around 54, with temperatures rising to around 56 overnight. East northeast wind 6 to 9 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 54°F | Mostly Cloudy then Chance Light Rain | 6 to 9 mph ENE | 32% |
| Saturday | 66°F | Rain Showers | 6 to 9 mph ESE | 88% |
| Saturday Night | 57°F | Showers And Thunderstorms | 6 to 9 mph E | 77% |
| Sunday | 66°F | Rain Showers Likely | 7 to 13 mph NNE | 62% |
| Sunday Night | 50°F | Chance Rain Showers then Mostly Cloudy | 13 mph NE | 45% |
| Monday | 62°F | Slight Chance Rain Showers | 12 to 15 mph NE | 17% |
| Monday Night | 48°F | Mostly Cloudy | 15 mph NE | 10% |
| Tuesday | 62°F | Mostly Cloudy then Slight Chance Rain Showers | 16 mph NE | 15% |
| Tuesday Night | 50°F | Chance Rain Showers | 15 mph NE | 47% |
| Wednesday | 61°F | Chance Rain Showers | 15 mph ENE | 47% |
| Wednesday Night | 50°F | Chance Rain Showers | 8 to 12 mph NE | 45% |
| Thursday | 64°F | Partly Sunny | 10 mph NNE | 11% |
| Thursday Night | 50°F | Mostly Cloudy | 8 mph NNE | 11% |
| Friday | 68°F | Mostly Sunny | 6 to 9 mph N | 7% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for South Lyon, MI
Last spring frost
May 5
First fall frost
Oct 13
Growing season
160 days
Hardiness zone
6a
Explore more for South Lyon, MI: full frost dates · planting calendar · Michigan frost dates
Climate data from the nearest NOAA station, Whitmore Lake 1Nw, Mi (6.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.