St. Joseph, IA Weather & Growing Conditions
This Afternoon
71°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Cloudy, with a high near 71. Southeast wind around 13 mph, with gusts as high as 22 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 71°F | Chance Showers And Thunderstorms | 13 mph SE | 30% |
| Tonight | 65°F | Chance Showers And Thunderstorms | 7 to 13 mph SSE | 57% |
| Saturday | 73°F | Patchy Fog | 6 to 10 mph NNW | 35% |
| Saturday Night | 58°F | Slight Chance Rain Showers then Cloudy | 13 mph N | 24% |
| Sunday | 67°F | Slight Chance Rain Showers | 15 mph NE | 20% |
| Sunday Night | 53°F | Chance Rain Showers | 13 mph ENE | 34% |
| Monday | 61°F | Rain Showers Likely | 13 mph ENE | 55% |
| Monday Night | 48°F | Chance Rain Showers | 6 to 10 mph ENE | 52% |
| Tuesday | 61°F | Partly Sunny | 8 mph ENE | 11% |
| Tuesday Night | 45°F | Partly Cloudy | 2 to 6 mph E | 1% |
| Wednesday | 65°F | Mostly Sunny | 5 mph ESE | 2% |
| Wednesday Night | 49°F | Partly Cloudy | 2 mph SE | 11% |
| Thursday | 68°F | Slight Chance Rain Showers | 5 mph SSE | 20% |
| Thursday Night | 52°F | Mostly Cloudy | 2 mph SSE | 8% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for St. Joseph, IA
Last spring frost
Apr 30
First fall frost
Oct 6
Growing season
160 days
Hardiness zone
5a
Explore more for St. Joseph, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Algona, Ia (11.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.