Ossian, IA Weather & Growing Conditions
Today
53°F
Mostly Cloudy
Mostly cloudy. High near 53, with temperatures falling to around 51 in the afternoon. Southwest wind 13 to 16 mph, with gusts as high as 26 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 53°F | Mostly Cloudy | 13 to 16 mph SW | 14% |
| Tonight | 44°F | Rain Showers Likely | 15 mph W | 66% |
| Thursday | 51°F | Chance Rain Showers | 12 to 17 mph NW | 25% |
| Thursday Night | 37°F | Mostly Cloudy | 7 to 12 mph N | 5% |
| Friday | 46°F | Mostly Sunny | 2 to 8 mph N | 0% |
| Friday Night | 28°F | Mostly Clear | 1 mph N | 0% |
| Saturday | 49°F | Sunny | 0 to 3 mph W | 0% |
| Saturday Night | 34°F | Mostly Clear | 5 mph W | 1% |
| Sunday | 55°F | Sunny | 3 to 7 mph W | 3% |
| Sunday Night | 36°F | Mostly Clear | 3 mph SW | 0% |
| Monday | 59°F | Sunny | 3 to 9 mph SW | 0% |
| Monday Night | 40°F | Mostly Clear | 6 mph W | 0% |
| Tuesday | 58°F | Sunny | 3 mph NW | 0% |
| Tuesday Night | 40°F | Partly Cloudy | 1 mph W | 2% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Ossian, IA
Last spring frost
May 1
First fall frost
Oct 3
Growing season
153 days
Hardiness zone
5a
Explore more for Ossian, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Postville, Ia (10.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.