St. John, KS Weather & Growing Conditions
Tonight
40°F
Mostly Clear
Mostly clear, with a low around 40. Northwest wind 6 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 40°F | Mostly Clear | 6 to 10 mph NW | 0% |
| Wednesday | 63°F | Sunny | 0 to 9 mph WNW | 0% |
| Wednesday Night | 42°F | Partly Cloudy then Chance Rain Showers | 0 to 5 mph NNW | 37% |
| Thursday | 56°F | Chance Rain Showers then Mostly Sunny | 6 to 12 mph NNW | 37% |
| Thursday Night | 36°F | Mostly Clear | 5 mph NNW | 1% |
| Friday | 57°F | Mostly Sunny | 3 mph NNE | 0% |
| Friday Night | 37°F | Partly Cloudy | 2 mph SSE | 1% |
| Saturday | 64°F | Mostly Sunny | 5 mph W | 3% |
| Saturday Night | 39°F | Clear | 3 mph W | 3% |
| Sunday | 67°F | Sunny | 5 mph WSW | 1% |
| Sunday Night | 43°F | Clear | 7 mph SSW | 0% |
| Monday | 69°F | Sunny | 9 mph SSW | 0% |
| Monday Night | 44°F | Mostly Clear | 3 to 7 mph WNW | 0% |
| Tuesday | 67°F | Mostly Sunny | 7 mph ENE | 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 Nov 4, 2026.