St. Mary, KY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Mary, a city in Marion County, Kentucky.
This Afternoon
79°F
Sunny
Sunny, with a high near 79. South wind around 9 mph.
7-day forecast for St. Mary
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 79°F | Sunny | 9 mph S | 2% |
| Tonight | 63°F | Showers And Thunderstorms | 7 to 13 mph S | 94% |
| Wednesday | 71°F | Showers And Thunderstorms | 7 to 13 mph S | 98% |
| Wednesday Night | 49°F | Mostly Cloudy | 2 to 6 mph SW | 5% |
| Thursday | 70°F | Mostly Sunny | 2 to 7 mph SW | 0% |
| Thursday Night | 43°F | Partly Cloudy | 2 mph W | 0% |
| Friday | 66°F | Mostly Sunny | 0 to 7 mph NW | 5% |
| Friday Night | 39°F | Mostly Cloudy | 5 mph N | 8% |
| Saturday | 58°F | Mostly Sunny | 5 mph N | 2% |
| Saturday Night | 33°F | Partly Cloudy | 2 mph N | 1% |
| Sunday | 60°F | Mostly Sunny | 0 to 5 mph W | 6% |
| Sunday Night | 31°F | Mostly Clear then Slight Chance Rain Showers | 3 mph W | 15% |
| Monday | 62°F | Slight Chance Rain Showers then Sunny | 1 to 6 mph W | 15% |
| Monday Night | 34°F | Mostly Clear | 5 mph SW | 6% |
Forecast source: National Weather Service (api.weather.gov) for St. Mary (37.583, -85.341). Updated through the day.
Growing snapshot for St. Mary
Last spring frost
Apr 22
First fall frost
Oct 20
Growing season
180 days
Hardiness zone
7a
More local growing data for St. Mary: nearby ZIP 40063 weather · frost dates · planting calendar · Kentucky frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Bradfordsville, Ky (11.8 mi from St. Mary). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.