St. Marys, KS Weather & Growing Conditions
Tonight
73°F
Partly Cloudy
Partly cloudy, with a low around 73. South wind 5 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 73°F | Partly Cloudy | 5 to 10 mph S | 10% |
| Saturday | 93°F | Slight Chance Showers And Thunderstorms | 10 mph S | 21% |
| Saturday Night | 66°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 mph N | 72% |
| Sunday | 77°F | Showers And Thunderstorms Likely | 5 to 10 mph N | 56% |
| Sunday Night | 62°F | Showers And Thunderstorms Likely | 5 to 10 mph N | 56% |
| Monday | 70°F | Chance Rain Showers | 5 to 10 mph N | 33% |
| Monday Night | 55°F | Mostly Cloudy | 5 to 10 mph NE | 6% |
| Tuesday | 67°F | Partly Sunny | 5 to 10 mph NE | 4% |
| Tuesday Night | 51°F | Partly Cloudy | 5 mph E | 3% |
| Wednesday | 70°F | Partly Sunny | 5 mph E | 2% |
| Wednesday Night | 55°F | Mostly Cloudy | 0 to 5 mph E | 7% |
| Thursday | 72°F | Chance Rain Showers | 0 to 5 mph SE | 30% |
| Thursday Night | 58°F | Slight Chance Rain Showers | 0 to 5 mph E | 24% |
| Friday | 73°F | Chance Rain Showers | 5 mph SE | 25% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for St. Marys, KS
Last spring frost
Apr 18
First fall frost
Oct 19
Growing season
183 days
Hardiness zone
6b
Explore more for St. Marys, KS: full frost dates · planting calendar · Kansas frost dates
Climate data from the nearest NOAA station, Wamego 4 W, Ks (16.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.