St. Mary, KY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Mary, a city in Marion County, Kentucky.
Today
86°F
Sunny
Sunny, with a high near 86. Northeast wind around 5 mph.
7-day forecast for St. Mary
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Sunny | 5 mph NE | 1% |
| Tonight | 68°F | Partly Cloudy | 0 to 3 mph N | 3% |
| Wednesday | 88°F | Mostly Sunny then Chance Showers And Thunderstorms | 2 mph SW | 34% |
| Wednesday Night | 69°F | Chance Showers And Thunderstorms then Partly Cloudy | 2 mph S | 34% |
| Thursday | 89°F | Mostly Sunny then Chance Showers And Thunderstorms | 2 to 6 mph SW | 26% |
| Thursday Night | 71°F | Chance Showers And Thunderstorms | 5 mph S | 35% |
| Friday | 88°F | Chance Showers And Thunderstorms | 7 mph SW | 52% |
| Friday Night | 69°F | Chance Showers And Thunderstorms | 5 mph S | 52% |
| Saturday | 87°F | Chance Showers And Thunderstorms | 6 mph SW | 43% |
| Saturday Night | 69°F | Chance Showers And Thunderstorms | 3 mph S | 43% |
| Sunday | 88°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 5 mph SW | 23% |
| Sunday Night | 71°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 3 mph SW | 23% |
| Monday | 90°F | Mostly Sunny | 3 to 7 mph SW | 14% |
| Monday Night | 72°F | Partly Cloudy then Slight Chance Rain Showers | 5 mph SW | 15% |
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 Aug 4, 2026.