Onslow, IA Weather & Growing Conditions
Today
80°F
Showers And Thunderstorms Likely then Chance Showers And Thunderstorms
Showers and thunderstorms likely before 11am, then a chance of showers and thunderstorms between 11am and 1pm, then a chance of showers and thunderstorms. Some of the storms could produce heavy rain. Mostly cloudy, with a high near 80. South wind 5 to 10 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 80°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 5 to 10 mph S | 74% |
| Tonight | 62°F | Showers And Thunderstorms Likely | 5 to 10 mph NW | 71% |
| Sunday | 68°F | Rain Showers Likely | 10 mph NE | 55% |
| Sunday Night | 55°F | Chance Rain Showers | 10 mph NE | 36% |
| Monday | 64°F | Chance Rain Showers | 10 mph NE | 46% |
| Monday Night | 49°F | Chance Rain Showers | 5 to 10 mph NE | 43% |
| Tuesday | 62°F | Chance Rain Showers then Partly Sunny | 5 to 10 mph NE | 38% |
| Tuesday Night | 46°F | Partly Cloudy | 5 mph NE | 5% |
| Wednesday | 66°F | Mostly Sunny | 5 mph NE | 2% |
| Wednesday Night | 50°F | Partly Cloudy | 0 to 5 mph NE | 1% |
| Thursday | 67°F | Mostly Sunny | 0 to 5 mph NE | 7% |
| Thursday Night | 52°F | Partly Cloudy | 0 mph | 5% |
| Friday | 70°F | Mostly Sunny | 0 to 5 mph E | 5% |
| Friday Night | 52°F | Partly Cloudy | 0 mph | 5% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Onslow, IA
Last spring frost
Apr 28
First fall frost
Oct 10
Growing season
164 days
Hardiness zone
5a
Explore more for Onslow, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Cascade, Ia (10.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.