St. Ansgar, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Ansgar, a city in Mitchell County, Iowa.
Overnight
62°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely. Cloudy, with a low around 62. Southeast wind around 10 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for St. Ansgar
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 62°F | Showers And Thunderstorms Likely | 10 mph SE | 57% |
| Saturday | 70°F | Chance Showers And Thunderstorms | 6 to 10 mph SW | 49% |
| Saturday Night | 55°F | Slight Chance Showers And Thunderstorms | 9 to 13 mph N | 20% |
| Sunday | 66°F | Mostly Cloudy | 15 mph NE | 7% |
| Sunday Night | 50°F | Mostly Cloudy then Slight Chance Rain Showers | 13 mph E | 21% |
| Monday | 61°F | Chance Rain Showers | 9 to 13 mph NE | 26% |
| Monday Night | 45°F | Slight Chance Rain Showers then Mostly Cloudy | 6 to 9 mph E | 19% |
| Tuesday | 61°F | Mostly Sunny | 8 mph E | 9% |
| Tuesday Night | 42°F | Mostly Clear | 6 mph E | 1% |
| Wednesday | 64°F | Sunny | 6 mph E | 1% |
| Wednesday Night | 47°F | Mostly Clear | 5 mph SE | 5% |
| Thursday | 66°F | Mostly Sunny | 5 mph SE | 11% |
| Thursday Night | 49°F | Partly Cloudy | 3 mph SE | 3% |
| Friday | 68°F | Mostly Sunny | 2 to 6 mph SE | 4% |
Forecast source: National Weather Service (api.weather.gov) for St. Ansgar (43.380, -92.918). Updated through the day.
Growing snapshot for St. Ansgar
Last spring frost
Apr 30
First fall frost
Oct 9
Growing season
163 days
Hardiness zone
5a
More local growing data for St. Ansgar: nearby ZIP 50472 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Osage, Ia (10.8 mi from St. Ansgar). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.