Osage, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Osage, a city in Mitchell County, Iowa.
Today
73°F
Showers And Thunderstorms
Showers and thunderstorms. Mostly cloudy. High near 73, with temperatures falling to around 70 in the afternoon. West wind 7 to 10 mph. Chance of precipitation is 90%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Osage
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 73°F | Showers And Thunderstorms | 7 to 10 mph W | 88% |
| Tonight | 57°F | Showers And Thunderstorms | 7 mph NW | 84% |
| Wednesday | 74°F | Mostly Sunny | 5 mph N | 2% |
| Wednesday Night | 54°F | Mostly Clear | 3 mph W | 1% |
| Thursday | 78°F | Sunny | 1 to 6 mph S | 0% |
| Thursday Night | 59°F | Mostly Clear | 6 mph S | 1% |
| Friday | 81°F | Sunny | 5 to 12 mph S | 10% |
| Friday Night | 64°F | Mostly Clear | 7 to 10 mph S | 14% |
| Saturday | 83°F | Sunny | 6 to 10 mph S | 13% |
| Saturday Night | 67°F | Chance Showers And Thunderstorms | 12 mph SW | 34% |
| Sunday | 83°F | Chance Showers And Thunderstorms | 10 mph S | 34% |
| Sunday Night | 66°F | Slight Chance Showers And Thunderstorms | 8 mph SE | 33% |
| Monday | 82°F | Chance Showers And Thunderstorms | 10 mph SE | 33% |
| Monday Night | 66°F | Mostly Cloudy then Chance Showers And Thunderstorms | 10 mph NE | 37% |
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 Aug 4, 2026.