St. Joseph, IA Weather & Growing Conditions
Today
77°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely. Mostly cloudy. High near 77, with temperatures falling to around 73 in the afternoon. North northwest wind 7 to 13 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 77°F | Showers And Thunderstorms Likely | 7 to 13 mph NNW | 63% |
| Tonight | 56°F | Showers And Thunderstorms Likely then Mostly Cloudy | 2 to 8 mph N | 58% |
| Wednesday | 77°F | Partly Sunny | 3 mph NE | 2% |
| Wednesday Night | 53°F | Mostly Clear | 3 mph SSE | 2% |
| Thursday | 82°F | Sunny | 1 to 7 mph S | 1% |
| Thursday Night | 60°F | Mostly Clear | 8 mph S | 2% |
| Friday | 85°F | Sunny | 6 to 13 mph SSW | 9% |
| Friday Night | 65°F | Slight Chance Showers And Thunderstorms | 6 to 13 mph S | 24% |
| Saturday | 89°F | Slight Chance Showers And Thunderstorms then Sunny | 5 to 15 mph S | 15% |
| Saturday Night | 68°F | Slight Chance Showers And Thunderstorms | 10 to 16 mph SE | 26% |
| Sunday | 88°F | Chance Showers And Thunderstorms then Mostly Sunny | 9 to 13 mph SE | 26% |
| Sunday Night | 68°F | Slight Chance Showers And Thunderstorms | 8 to 12 mph SE | 30% |
| Monday | 87°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 9 to 14 mph E | 30% |
| Monday Night | 68°F | Slight Chance Showers And Thunderstorms | 10 to 15 mph ENE | 32% |
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 Aug 4, 2026.