Onawa, IA Weather & Growing Conditions
Overnight
68°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 3am, then showers and thunderstorms likely. Mostly cloudy. Low around 68, with temperatures rising to around 71 overnight. West northwest wind around 7 mph. Chance of precipitation is 70%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 68°F | Chance Showers And Thunderstorms | 7 mph WNW | 65% |
| Saturday | 74°F | Chance Showers And Thunderstorms then Mostly Cloudy | 6 to 10 mph NNW | 47% |
| Saturday Night | 59°F | Slight Chance Rain Showers then Mostly Cloudy | 10 mph N | 15% |
| Sunday | 64°F | Chance Rain Showers | 8 to 12 mph NNE | 37% |
| Sunday Night | 55°F | Chance Rain Showers | 7 to 10 mph NE | 53% |
| Monday | 60°F | Rain Showers Likely | 9 mph ENE | 62% |
| Monday Night | 50°F | Chance Rain Showers then Mostly Cloudy | 3 to 9 mph ENE | 42% |
| Tuesday | 62°F | Partly Sunny | 3 to 7 mph E | 8% |
| Tuesday Night | 46°F | Partly Cloudy | 5 mph ESE | 1% |
| Wednesday | 65°F | Mostly Sunny | 2 to 7 mph SE | 3% |
| Wednesday Night | 52°F | Partly Cloudy then Chance Rain Showers | 6 mph SE | 31% |
| Thursday | 66°F | Chance Rain Showers | 7 mph SE | 31% |
| Thursday Night | 55°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 6 mph SE | 16% |
| Friday | 69°F | Slight Chance Showers And Thunderstorms then Mostly Cloudy | 3 to 8 mph SE | 16% |
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 Sep 19, 2026.