St. Louis, MI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Louis, a city in Gratiot County, Michigan.
Overnight
61°F
Partly Cloudy
Partly cloudy, with a low around 61. South wind around 12 mph, with gusts as high as 24 mph.
7-day forecast for St. Louis
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 61°F | Partly Cloudy | 12 mph S | 6% |
| Wednesday | 71°F | Rain Showers | 15 mph S | 76% |
| Wednesday Night | 48°F | Chance Rain Showers | 12 mph SSW | 38% |
| Thursday | 56°F | Chance Rain Showers | 14 mph SW | 45% |
| Thursday Night | 39°F | Rain Showers Likely | 6 to 10 mph W | 64% |
| Friday | 49°F | Rain Showers Likely | 12 mph NNW | 64% |
| Friday Night | 32°F | Rain Showers Likely | 7 to 10 mph NNW | 64% |
| Saturday | 51°F | Mostly Sunny | 9 mph NW | 4% |
| Saturday Night | 30°F | Partly Cloudy | 6 mph W | 2% |
| Sunday | 55°F | Mostly Sunny | 5 to 13 mph W | 8% |
| Sunday Night | 32°F | Mostly Clear | 5 to 9 mph W | 8% |
| Monday | 59°F | Mostly Sunny | 5 to 12 mph WSW | 1% |
| Monday Night | 37°F | Partly Cloudy | 9 mph WSW | 5% |
| Tuesday | 61°F | Mostly Sunny | 7 to 13 mph W | 8% |
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 Nov 4, 2026.