Onawa, IA Weather & Growing Conditions
Overnight
39°F
Slight Chance Rain Showers
A slight chance of rain showers. Cloudy. Low around 39, with temperatures rising to around 43 overnight. Northwest wind around 15 mph, with gusts as high as 28 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 39°F | Slight Chance Rain Showers | 15 mph NW | 16% |
| Wednesday | 49°F | Chance Rain Showers | 15 mph WNW | 36% |
| Wednesday Night | 38°F | Chance Rain Showers | 13 mph NW | 30% |
| Thursday | 50°F | Mostly Cloudy | 10 to 14 mph NNW | 14% |
| Thursday Night | 34°F | Mostly Cloudy | 3 to 8 mph N | 0% |
| Friday | 50°F | Mostly Sunny | 0 to 3 mph N | 1% |
| Friday Night | 30°F | Partly Cloudy | 2 mph SE | 0% |
| Saturday | 55°F | Mostly Sunny | 2 to 6 mph SSW | 0% |
| Saturday Night | 34°F | Mostly Clear | 3 mph WSW | 0% |
| Sunday | 60°F | Sunny | 2 to 6 mph WSW | 0% |
| Sunday Night | 37°F | Clear | 6 mph S | 0% |
| Monday | 64°F | Sunny | 8 mph WSW | 0% |
| Monday Night | 39°F | Mostly Clear | 5 mph NW | 0% |
| Tuesday | 62°F | Mostly Sunny | 5 mph NNW | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Onawa, IA
Last spring frost
May 1
First fall frost
Oct 3
Growing season
154 days
Hardiness zone
5a
Explore more for Onawa, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Onawa 3Nw, Ia (3.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.