St. John, KS Weather & Growing Conditions
Overnight
40°F
Clear
Clear, with a low around 40. West northwest wind around 7 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 40°F | Clear | 7 mph WNW | 0% |
| Wednesday | 61°F | Sunny | 0 to 8 mph WNW | 0% |
| Wednesday Night | 43°F | Partly Cloudy then Chance Rain Showers | 0 to 6 mph N | 26% |
| Thursday | 56°F | Chance Rain Showers then Partly Sunny | 6 to 12 mph NNW | 34% |
| Thursday Night | 34°F | Mostly Clear | 5 mph NNW | 0% |
| Friday | 56°F | Mostly Sunny | 3 mph NNE | 0% |
| Friday Night | 36°F | Mostly Cloudy | 2 mph SE | 0% |
| Saturday | 60°F | Mostly Sunny | 3 mph W | 0% |
| Saturday Night | 38°F | Mostly Clear | 3 mph WSW | 0% |
| Sunday | 64°F | Sunny | 3 mph WSW | 0% |
| Sunday Night | 42°F | Clear | 6 mph S | 0% |
| Monday | 69°F | Sunny | 6 to 9 mph SSW | 1% |
| Monday Night | 44°F | Mostly Clear | 6 mph WSW | 0% |
| Tuesday | 68°F | Sunny | 6 mph NE | 1% |
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.