St. John, KS Weather & Growing Conditions
This Afternoon
93°F
Slight Chance Rain Showers
A slight chance of rain showers. Mostly sunny, with a high near 93. South wind around 12 mph. Chance of precipitation is 20%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 93°F | Slight Chance Rain Showers | 12 mph S | 20% |
| Tonight | 64°F | Slight Chance Showers And Thunderstorms | 10 to 14 mph NE | 25% |
| Wednesday | 87°F | Partly Sunny | 9 mph NNE | 11% |
| Wednesday Night | 65°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 5 to 10 mph NE | 22% |
| Thursday | 90°F | Chance Showers And Thunderstorms | 5 to 8 mph ESE | 27% |
| Thursday Night | 69°F | Chance Showers And Thunderstorms | 8 mph SE | 54% |
| Friday | 96°F | Chance Showers And Thunderstorms then Sunny | 5 to 8 mph SSE | 33% |
| Friday Night | 70°F | Mostly Clear | 7 mph SE | 8% |
| Saturday | 99°F | Sunny | 5 to 13 mph S | 6% |
| Saturday Night | 73°F | Mostly Clear | 12 mph S | 3% |
| Sunday | 100°F | Sunny | 12 to 16 mph SSW | 2% |
| Sunday Night | 76°F | Mostly Clear | 15 mph S | 0% |
| Monday | 100°F | Sunny | 16 mph SSW | 1% |
| Monday Night | 75°F | Mostly Clear | 14 mph S | 2% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for St. John, KS
Last spring frost
Apr 18
First fall frost
Oct 21
Growing season
185 days
Hardiness zone
6b
Explore more for St. John, KS: full frost dates · planting calendar · Kansas frost dates
Climate data from the nearest NOAA station, Hudson, Ks (8.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.