St. Marys, KS Weather & Growing Conditions
Today
90°F
Partly Sunny
Partly sunny, with a high near 90. Southeast wind 5 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 90°F | Partly Sunny | 5 to 10 mph SE | 12% |
| Tonight | 68°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 5 to 10 mph E | 23% |
| Wednesday | 80°F | Chance Showers And Thunderstorms | 10 mph NE | 33% |
| Wednesday Night | 65°F | Slight Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 to 10 mph NE | 62% |
| Thursday | 84°F | Showers And Thunderstorms Likely then Mostly Sunny | 5 mph E | 62% |
| Thursday Night | 67°F | Chance Showers And Thunderstorms | 5 mph SE | 45% |
| Friday | 89°F | Chance Showers And Thunderstorms then Mostly Sunny | 5 mph S | 45% |
| Friday Night | 70°F | Mostly Clear | 5 mph S | 6% |
| Saturday | 93°F | Sunny | 5 to 10 mph S | 5% |
| Saturday Night | 74°F | Mostly Clear | 10 mph S | 1% |
| Sunday | 95°F | Sunny | 10 to 15 mph S | 1% |
| Sunday Night | 75°F | Mostly Clear | 15 mph S | 2% |
| Monday | 95°F | Mostly Sunny | 10 to 15 mph S | 2% |
| Monday Night | 76°F | Mostly Clear | 15 mph S | 2% |
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 Aug 4, 2026.