St. Joseph, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Joseph, a community in Humboldt County, Iowa.
Overnight
65°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 5am, then patchy fog and a chance of showers and thunderstorms. Cloudy. Low around 65, with temperatures rising to around 67 overnight. Northeast wind around 6 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for St. Joseph
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 65°F | Chance Showers And Thunderstorms | 6 mph NE | 39% |
| Saturday | 73°F | Patchy Fog then Slight Chance Showers And Thunderstorms | 6 to 10 mph NNW | 43% |
| Saturday Night | 58°F | Slight Chance Rain Showers then Cloudy | 13 mph N | 21% |
| Sunday | 67°F | Mostly Cloudy then Slight Chance Drizzle | 15 mph NE | 19% |
| Sunday Night | 53°F | Chance Rain Showers | 13 mph ENE | 41% |
| Monday | 62°F | Chance Rain Showers | 12 mph ENE | 49% |
| Monday Night | 47°F | Chance Rain Showers then Mostly Cloudy | 5 to 9 mph ENE | 30% |
| Tuesday | 62°F | Mostly Sunny | 5 to 8 mph ENE | 8% |
| Tuesday Night | 44°F | Mostly Clear | 2 to 6 mph E | 0% |
| Wednesday | 66°F | Sunny | 5 mph ESE | 1% |
| Wednesday Night | 49°F | Partly Cloudy then Slight Chance Rain Showers | 3 mph SE | 15% |
| Thursday | 68°F | Slight Chance Rain Showers | 2 to 6 mph SE | 16% |
| Thursday Night | 52°F | Mostly Cloudy | 3 mph SE | 8% |
| Friday | 70°F | Partly Sunny | 3 to 7 mph SE | 8% |
Forecast source: National Weather Service (api.weather.gov) for St. Joseph (42.912, -94.231). Updated through the day.
Growing snapshot for St. Joseph
Last spring frost
Apr 30
First fall frost
Oct 6
Growing season
160 days
Hardiness zone
5a
More local growing data for St. Joseph: nearby ZIP 50519 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Algona, Ia (11.5 mi from St. Joseph). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.