Ossian, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Ossian, a city in Winneshiek County, Iowa.
Tonight
57°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Cloudy, with a low around 57. Northeast wind around 12 mph, with gusts as high as 20 mph. Chance of precipitation is 30%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Ossian
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 57°F | Chance Showers And Thunderstorms | 12 mph NE | 30% |
| Sunday | 67°F | Slight Chance Rain Showers then Mostly Cloudy | 13 mph NE | 17% |
| Sunday Night | 51°F | Mostly Cloudy then Slight Chance Rain Showers | 12 mph NE | 21% |
| Monday | 60°F | Rain Showers Likely | 12 mph NE | 56% |
| Monday Night | 47°F | Rain Showers Likely | 9 mph NE | 56% |
| Tuesday | 59°F | Chance Rain Showers then Partly Sunny | 9 mph NE | 33% |
| Tuesday Night | 44°F | Partly Cloudy | 5 mph NE | 4% |
| Wednesday | 63°F | Mostly Sunny | 5 mph E | 1% |
| Wednesday Night | 49°F | Partly Cloudy | 2 mph E | 2% |
| Thursday | 65°F | Partly Sunny | 2 mph E | 12% |
| Thursday Night | 53°F | Mostly Cloudy | 1 mph E | 12% |
| Friday | 69°F | Partly Sunny | 2 mph E | 9% |
| Friday Night | 54°F | Mostly Cloudy | 2 mph E | 4% |
| Saturday | 69°F | Slight Chance Rain Showers | 5 mph SE | 17% |
Forecast source: National Weather Service (api.weather.gov) for Ossian (43.147, -91.765). Updated through the day.
Growing snapshot for Ossian
Last spring frost
May 1
First fall frost
Oct 3
Growing season
153 days
Hardiness zone
5a
More local growing data for Ossian: nearby ZIP 52161 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Postville, Ia (10.3 mi from Ossian). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.