Onawa, IA Weather & Growing Conditions
Today
74°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 1pm, then patchy smoke and a chance of showers and thunderstorms between 1pm and 2pm, then patchy smoke and showers and thunderstorms likely between 2pm and 4pm, then patchy smoke and a chance of showers and thunderstorms between 4pm and 5pm, then patchy smoke and a slight chance of showers and thunderstorms. Mostly cloudy. High near 74, with temperatures falling to around 72 in the afternoon. North wind around 13 mph, with gusts as high as 22 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 74°F | Chance Showers And Thunderstorms | 13 mph N | 71% |
| Tonight | 58°F | Patchy Smoke | 2 to 10 mph NNE | 48% |
| Wednesday | 74°F | Patchy Smoke | 5 mph NE | 19% |
| Wednesday Night | 54°F | Mostly Clear | 1 to 5 mph SE | 2% |
| Thursday | 81°F | Sunny | 1 to 8 mph SSE | 1% |
| Thursday Night | 62°F | Mostly Clear | 5 to 8 mph SSE | 3% |
| Friday | 86°F | Sunny | 5 to 10 mph S | 3% |
| Friday Night | 67°F | Mostly Clear | 5 to 9 mph S | 9% |
| Saturday | 90°F | Sunny | 5 to 17 mph S | 3% |
| Saturday Night | 70°F | Mostly Clear | 10 to 17 mph S | 13% |
| Sunday | 90°F | Mostly Sunny | 9 to 13 mph SSE | 10% |
| Sunday Night | 71°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 10 to 15 mph SSE | 18% |
| Monday | 90°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 10 to 17 mph SE | 18% |
| Monday Night | 71°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 10 to 17 mph E | 17% |
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 Aug 4, 2026.