St. Ansgar, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Ansgar, a city in Mitchell County, Iowa.
Tonight
46°F
Showers And Thunderstorms
Showers and thunderstorms. Cloudy. Low around 46, with temperatures rising to around 51 overnight. South wind around 9 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for St. Ansgar
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 46°F | Showers And Thunderstorms | 9 mph S | 89% |
| Wednesday | 52°F | Rain Showers | 9 to 15 mph SW | 84% |
| Wednesday Night | 41°F | Rain Showers | 14 mph W | 91% |
| Thursday | 49°F | Rain Showers Likely | 15 mph NW | 67% |
| Thursday Night | 35°F | Mostly Cloudy | 7 to 12 mph N | 11% |
| Friday | 47°F | Partly Sunny | 3 to 8 mph N | 0% |
| Friday Night | 29°F | Partly Cloudy | 2 mph NE | 1% |
| Saturday | 52°F | Mostly Sunny | 1 to 7 mph SW | 1% |
| Saturday Night | 34°F | Partly Cloudy | 6 mph W | 5% |
| Sunday | 57°F | Sunny | 5 to 8 mph W | 8% |
| Sunday Night | 35°F | Mostly Clear | 6 mph SW | 1% |
| Monday | 60°F | Mostly Sunny | 6 to 12 mph SW | 0% |
| Monday Night | 38°F | Mostly Clear | 7 mph W | 1% |
| Tuesday | 58°F | Mostly Sunny | 7 mph NW | 2% |
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 Nov 4, 2026.