St. Louis, MI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Louis, a city in Gratiot County, Michigan.
This Afternoon
71°F
Cloudy
Cloudy. High near 71, with temperatures falling to around 68 in the afternoon. East northeast wind around 9 mph.
7-day forecast for St. Louis
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 71°F | Cloudy | 9 mph ENE | 2% |
| Tonight | 50°F | Mostly Cloudy then Chance Rain Showers | 5 to 10 mph ENE | 33% |
| Saturday | 64°F | Showers And Thunderstorms Likely | 5 to 8 mph E | 71% |
| Saturday Night | 53°F | Rain Showers Likely | 5 to 8 mph ENE | 60% |
| Sunday | 68°F | Chance Rain Showers | 8 to 13 mph NE | 44% |
| Sunday Night | 48°F | Mostly Cloudy | 8 to 13 mph NE | 11% |
| Monday | 62°F | Mostly Cloudy | 12 to 15 mph NE | 5% |
| Monday Night | 45°F | Mostly Cloudy | 9 to 15 mph NE | 5% |
| Tuesday | 62°F | Partly Sunny then Slight Chance Rain Showers | 10 to 16 mph NE | 15% |
| Tuesday Night | 46°F | Slight Chance Rain Showers | 9 to 16 mph ENE | 21% |
| Wednesday | 63°F | Chance Rain Showers | 13 mph ENE | 36% |
| Wednesday Night | 47°F | Chance Rain Showers then Mostly Cloudy | 5 to 12 mph NE | 28% |
| Thursday | 67°F | Partly Sunny | 6 to 10 mph NE | 8% |
| Thursday Night | 47°F | Mostly Cloudy | 3 to 8 mph NNE | 6% |
Forecast source: National Weather Service (api.weather.gov) for St. Louis (43.409, -84.611). Updated through the day.
Growing snapshot for St. Louis
Last spring frost
May 1
First fall frost
Oct 13
Growing season
164 days
Hardiness zone
6a
More local growing data for St. Louis: nearby ZIP 48880 weather · frost dates · planting calendar · Michigan frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Alma, Mi (6.1 mi from St. Louis). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 18, 2026.