St. Marys, KS Weather & Growing Conditions
Overnight
44°F
Mostly Cloudy
Mostly cloudy, with a low around 44. Northwest wind around 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 44°F | Mostly Cloudy | 10 mph NW | 0% |
| Wednesday | 57°F | Partly Sunny | 5 to 15 mph W | 0% |
| Wednesday Night | 39°F | Clear | 5 mph W | 0% |
| Thursday | 56°F | Mostly Sunny | 5 to 10 mph NW | 1% |
| Thursday Night | 40°F | Partly Cloudy | 5 mph N | 0% |
| Friday | 55°F | Mostly Sunny | 5 mph N | 0% |
| Friday Night | 35°F | Mostly Cloudy | 0 mph | 0% |
| Saturday | 58°F | Mostly Sunny | 0 to 5 mph SW | 0% |
| Saturday Night | 37°F | Mostly Clear | 0 mph | 0% |
| Sunday | 64°F | Sunny | 0 to 5 mph W | 0% |
| Sunday Night | 40°F | Clear | 0 mph | 0% |
| Monday | 70°F | Sunny | 0 to 10 mph SW | 0% |
| Monday Night | 43°F | Clear | 0 to 5 mph W | 0% |
| Tuesday | 70°F | Sunny | 0 to 5 mph NE | 0% |
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 Nov 4, 2026.