St. Joseph, IA Weather & Growing Conditions
Tonight
43°F
Rain Showers
Rain showers. Cloudy. Low around 43, with temperatures rising to around 46 overnight. Northwest wind around 16 mph, with gusts as high as 23 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 43°F | Rain Showers | 16 mph NW | 92% |
| Wednesday | 49°F | Rain Showers Likely | 17 mph WNW | 65% |
| Wednesday Night | 40°F | Rain Showers | 12 to 15 mph WNW | 82% |
| Thursday | 50°F | Rain Showers Likely | 15 mph NNW | 58% |
| Thursday Night | 36°F | Mostly Cloudy | 6 to 12 mph N | 9% |
| Friday | 49°F | Partly Sunny | 2 to 6 mph NNE | 0% |
| Friday Night | 31°F | Partly Cloudy | 2 mph SE | 1% |
| Saturday | 55°F | Mostly Sunny | 1 to 6 mph SW | 3% |
| Saturday Night | 35°F | Partly Cloudy | 5 mph W | 5% |
| Sunday | 60°F | Sunny | 7 mph W | 5% |
| Sunday Night | 37°F | Mostly Clear | 6 mph SW | 2% |
| Monday | 63°F | Sunny | 7 to 12 mph WSW | 0% |
| Monday Night | 39°F | Mostly Clear | 7 mph WNW | 0% |
| Tuesday | 60°F | Mostly Sunny | 7 mph WNW | 1% |
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 Nov 4, 2026.