Osage, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Osage, a city in Mitchell County, Iowa.
Tonight
47°F
Showers And Thunderstorms
Rain showers before 9pm, then showers and thunderstorms. Cloudy. Low around 47, with temperatures rising to around 51 overnight. Northeast wind around 9 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Osage
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 47°F | Showers And Thunderstorms | 9 mph NE | 82% |
| Wednesday | 52°F | Rain Showers | 9 to 15 mph SW | 79% |
| Wednesday Night | 42°F | Rain Showers | 14 mph W | 81% |
| Thursday | 49°F | Rain Showers Likely | 14 mph NW | 68% |
| Thursday Night | 36°F | Mostly Cloudy | 8 to 12 mph N | 11% |
| Friday | 47°F | Partly Sunny | 5 to 8 mph N | 0% |
| Friday Night | 29°F | Partly Cloudy | 2 mph NW | 1% |
| Saturday | 52°F | Mostly Sunny | 1 to 6 mph SW | 1% |
| Saturday Night | 34°F | Partly Cloudy | 6 mph W | 5% |
| Sunday | 57°F | Sunny | 8 mph W | 8% |
| Sunday Night | 36°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 | 57°F | Mostly Sunny | 7 mph NW | 1% |
Forecast source: National Weather Service (api.weather.gov) for Osage (43.283, -92.811). Updated through the day.
Growing snapshot for Osage
Last spring frost
Apr 30
First fall frost
Oct 9
Growing season
163 days
Hardiness zone
5a
More local growing data for Osage: nearby ZIP 50461 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Osage, Ia (1.9 mi from Osage). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.