Ossian, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Ossian, a city in Winneshiek County, Iowa.
Today
75°F
Scattered Showers And Thunderstorms
Isolated rain showers before 4pm, then scattered showers and thunderstorms between 4pm and 5pm, then scattered showers and thunderstorms. Mostly cloudy. High near 75, with temperatures falling to around 72 in the afternoon. West wind 5 to 8 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 |
|---|---|---|---|---|
| Today | 75°F | Scattered Showers And Thunderstorms | 5 to 8 mph W | 31% |
| Tonight | 59°F | Scattered Showers And Thunderstorms | 5 mph NW | 64% |
| Wednesday | 73°F | Slight Chance Rain Showers then Partly Sunny | 5 mph N | 15% |
| Wednesday Night | 54°F | Mostly Clear | 2 mph NW | 2% |
| Thursday | 77°F | Sunny | 2 mph SW | 1% |
| Thursday Night | 58°F | Mostly Clear | 3 mph S | 1% |
| Friday | 80°F | Sunny | 3 to 9 mph S | 5% |
| Friday Night | 63°F | Mostly Clear | 7 mph S | 10% |
| Saturday | 81°F | Mostly Sunny | 7 mph S | 9% |
| Saturday Night | 67°F | Chance Showers And Thunderstorms | 8 mph S | 32% |
| Sunday | 83°F | Chance Showers And Thunderstorms | 9 mph S | 32% |
| Sunday Night | 66°F | Chance Showers And Thunderstorms | 6 mph S | 40% |
| Monday | 81°F | Chance Rain Showers | 8 mph S | 40% |
| Monday Night | 66°F | Chance Showers And Thunderstorms | 7 mph NE | 35% |
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 Aug 4, 2026.