St. John, KS Weather & Growing Conditions
Tonight
74°F
Mostly Clear
Mostly clear, with a low around 74. South wind 12 to 16 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 74°F | Mostly Clear | 12 to 16 mph S | 5% |
| Saturday | 98°F | Sunny then Slight Chance Showers And Thunderstorms | 10 to 14 mph SW | 15% |
| Saturday Night | 65°F | Chance Showers And Thunderstorms | 5 to 8 mph NE | 55% |
| Sunday | 79°F | Chance Showers And Thunderstorms | 9 mph NNE | 26% |
| Sunday Night | 60°F | Chance Rain Showers | 5 to 9 mph NNE | 25% |
| Monday | 77°F | Partly Sunny | 5 to 8 mph NNE | 13% |
| Monday Night | 55°F | Mostly Clear | 7 mph NE | 2% |
| Tuesday | 75°F | Mostly Sunny | 6 mph ENE | 3% |
| Tuesday Night | 55°F | Partly Cloudy | 7 mph E | 6% |
| Wednesday | 77°F | Slight Chance Rain Showers | 7 mph SE | 15% |
| Wednesday Night | 61°F | Mostly Cloudy then Chance Rain Showers | 6 mph SE | 42% |
| Thursday | 78°F | Chance Rain Showers | 6 mph SSE | 42% |
| Thursday Night | 61°F | Chance Rain Showers | 5 mph SE | 38% |
| Friday | 80°F | Chance Rain Showers | 7 mph SSE | 38% |
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 Sep 19, 2026.