Osage, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Osage, a city in Mitchell County, Iowa.
Overnight
47°F
Rain Showers Likely
Rain showers likely. Mostly cloudy. Low around 47, with temperatures rising to around 50 overnight. Northwest wind 6 to 10 mph. Chance of precipitation is 70%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Osage
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 47°F | Rain Showers Likely | 6 to 10 mph NW | 72% |
| Wednesday | 51°F | Rain Showers Likely | 12 to 15 mph W | 73% |
| Wednesday Night | 42°F | Rain Showers Likely | 10 to 14 mph W | 71% |
| Thursday | 50°F | Chance Rain Showers then Cloudy | 15 mph NW | 44% |
| Thursday Night | 34°F | Mostly Cloudy | 6 to 12 mph N | 4% |
| Friday | 46°F | Mostly Sunny | 3 to 7 mph N | 1% |
| Friday Night | 27°F | Mostly Clear | 3 mph N | 0% |
| Saturday | 49°F | Sunny | 1 to 6 mph SW | 0% |
| Saturday Night | 34°F | Mostly Clear | 5 mph W | 1% |
| Sunday | 55°F | Sunny | 7 mph W | 3% |
| Sunday Night | 35°F | Mostly Clear | 5 mph SW | 0% |
| Monday | 61°F | Sunny | 5 to 10 mph SW | 0% |
| Monday Night | 38°F | Mostly Clear | 6 mph W | 0% |
| Tuesday | 58°F | Mostly Sunny | 5 mph NW | 0% |
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.