St. Louis, MI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Louis, a city in Gratiot County, Michigan.
Today
87°F
Sunny
Sunny, with a high near 87. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.
7-day forecast for St. Louis
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Sunny | 5 to 10 mph SW | 0% |
| Tonight | 61°F | Mostly Clear | 3 to 9 mph SW | 0% |
| Wednesday | 83°F | Chance Rain Showers then Chance Showers And Thunderstorms | 5 to 10 mph SW | 65% |
| Wednesday Night | 62°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 2 to 8 mph W | 83% |
| Thursday | 80°F | Rain Showers | 5 mph NW | 83% |
| Thursday Night | 59°F | Chance Showers And Thunderstorms then Partly Cloudy | 1 to 5 mph SSE | 40% |
| Friday | 84°F | Mostly Sunny | 1 to 5 mph SSW | 10% |
| Friday Night | 60°F | Mostly Clear | 5 mph SW | 10% |
| Saturday | 87°F | Sunny | 5 to 13 mph WSW | 4% |
| Saturday Night | 64°F | Mostly Clear then Chance Rain Showers | 5 to 12 mph SW | 31% |
| Sunday | 87°F | Chance Rain Showers then Slight Chance Showers And Thunderstorms | 7 to 15 mph SW | 31% |
| Sunday Night | 64°F | Chance Showers And Thunderstorms | 6 to 14 mph WSW | 53% |
| Monday | 85°F | Chance Rain Showers | 6 to 9 mph W | 53% |
| Monday Night | 63°F | Chance Showers And Thunderstorms | 3 to 9 mph WNW | 46% |
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 Aug 4, 2026.