St. Joseph, MO Weather & Growing Conditions
Today
90°F
Mostly Sunny
Mostly sunny, with a high near 90. Heat index values as high as 98. Southwest wind 7 to 10 mph, with gusts as high as 18 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 90°F | Mostly Sunny | 7 to 10 mph SW | 10% |
| Tonight | 66°F | Showers And Thunderstorms Likely then Showers And Thunderstorms | 2 to 6 mph NW | 78% |
| Sunday | 76°F | Chance Showers And Thunderstorms | 3 to 9 mph NNE | 34% |
| Sunday Night | 60°F | Showers And Thunderstorms Likely | 5 to 8 mph NNE | 60% |
| Monday | 66°F | Chance Rain Showers | 7 to 10 mph NNE | 52% |
| Monday Night | 53°F | Slight Chance Rain Showers then Mostly Cloudy | 5 to 10 mph NNE | 20% |
| Tuesday | 64°F | Partly Sunny | 8 mph NE | 5% |
| Tuesday Night | 48°F | Partly Cloudy | 2 to 7 mph ENE | 5% |
| Wednesday | 67°F | Mostly Sunny | 5 mph ENE | 1% |
| Wednesday Night | 52°F | Partly Cloudy | 3 mph E | 10% |
| Thursday | 71°F | Slight Chance Rain Showers | 1 to 5 mph ESE | 23% |
| Thursday Night | 57°F | Chance Rain Showers | 3 mph E | 25% |
| Friday | 72°F | Chance Rain Showers | 2 to 7 mph ESE | 27% |
| Friday Night | 57°F | Mostly Cloudy then Slight Chance Showers And Thunderstorms | 6 mph E | 15% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for St. Joseph, MO
Last spring frost
Apr 19
First fall frost
Oct 17
Growing season
180 days
Hardiness zone
6a
Explore more for St. Joseph, MO: full frost dates · planting calendar · Missouri frost dates
Climate data from the nearest NOAA station, St Joseph Rosecrans Ap, Mo (5.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.