St. John, KS Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. John, a city in Stafford County, Kansas.
Today
97°F
Sunny then Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms after 4pm. Sunny. High near 97, with temperatures falling to around 93 in the afternoon. Southwest wind 9 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for St. John
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 97°F | Sunny then Slight Chance Showers And Thunderstorms | 9 to 15 mph SW | 21% |
| Tonight | 65°F | Chance Showers And Thunderstorms | 5 to 8 mph NE | 50% |
| Sunday | 77°F | Slight Chance Showers And Thunderstorms | 9 mph NNE | 20% |
| Sunday Night | 59°F | Slight Chance Rain Showers then Mostly Cloudy | 5 to 9 mph NNE | 24% |
| Monday | 76°F | Partly Sunny | 8 mph NNE | 10% |
| Monday Night | 54°F | Partly Cloudy | 3 to 7 mph ENE | 1% |
| Tuesday | 73°F | Partly Sunny | 6 mph ENE | 2% |
| Tuesday Night | 53°F | Partly Cloudy | 6 mph ESE | 5% |
| Wednesday | 76°F | Partly Sunny | 7 mph SE | 12% |
| Wednesday Night | 59°F | Mostly Cloudy then Chance Showers And Thunderstorms | 7 mph SE | 32% |
| Thursday | 80°F | Chance Showers And Thunderstorms | 8 mph SSE | 37% |
| Thursday Night | 61°F | Slight Chance Showers And Thunderstorms | 6 mph SSE | 38% |
| Friday | 80°F | Chance Showers And Thunderstorms | 7 mph SSE | 38% |
| Friday Night | 62°F | Slight Chance Showers And Thunderstorms | 6 mph SE | 34% |
Forecast source: National Weather Service (api.weather.gov) for St. John (38.000, -98.761). Updated through the day.
Growing snapshot for St. John
Last spring frost
Apr 18
First fall frost
Oct 21
Growing season
185 days
Hardiness zone
6b
More local growing data for St. John: nearby ZIP 67576 weather · frost dates · planting calendar · Kansas frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Hudson, Ks (8.8 mi from St. John). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.