South Lyon, MI Weather & Growing Conditions
Today
66°F
Rain Showers Likely
Rain showers likely before 2pm, then showers and thunderstorms likely between 2pm and 4pm, then patchy fog and a chance of showers and thunderstorms. Cloudy. High near 66, with temperatures falling to around 64 in the afternoon. East southeast wind 6 to 9 mph, with gusts as high as 18 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 |
|---|---|---|---|---|
| Today | 66°F | Rain Showers Likely | 6 to 9 mph ESE | 74% |
| Tonight | 58°F | Patchy Fog | 5 to 8 mph ESE | 93% |
| Sunday | 68°F | Chance Rain Showers | 7 to 13 mph NNE | 46% |
| Sunday Night | 51°F | Mostly Cloudy | 13 mph NE | 2% |
| Monday | 62°F | Mostly Cloudy | 14 mph NE | 2% |
| Monday Night | 48°F | Mostly Cloudy | 14 mph NE | 5% |
| Tuesday | 62°F | Partly Sunny | 16 mph NE | 11% |
| Tuesday Night | 49°F | Chance Rain Showers | 16 mph ENE | 42% |
| Wednesday | 61°F | Chance Rain Showers | 14 to 17 mph ENE | 51% |
| Wednesday Night | 50°F | Chance Rain Showers | 8 to 14 mph ENE | 48% |
| Thursday | 64°F | Slight Chance Rain Showers then Partly Sunny | 12 mph ENE | 17% |
| Thursday Night | 50°F | Mostly Cloudy | 6 to 9 mph NE | 14% |
| Friday | 68°F | Mostly Sunny | 7 to 10 mph NE | 7% |
| Friday Night | 50°F | Mostly Clear | 6 to 9 mph NE | 7% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for South Lyon, MI
Last spring frost
May 6
First fall frost
Oct 12
Growing season
157 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, Milford Gm Proving Ground, Mi (6.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.