Onslow, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Onslow, a city in Jones County, Iowa.
This Afternoon
76°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely. Mostly cloudy. High near 76, with temperatures falling to around 71 in the afternoon. South wind around 5 mph. Chance of precipitation is 70%.
7-day forecast for Onslow
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 76°F | Showers And Thunderstorms Likely | 5 mph S | 68% |
| Tonight | 62°F | Showers And Thunderstorms | 0 to 10 mph NE | 83% |
| Sunday | 66°F | Rain Showers Likely | 10 mph NE | 55% |
| Sunday Night | 55°F | Chance Rain Showers | 10 mph NE | 37% |
| Monday | 62°F | Rain Showers Likely | 10 mph NE | 65% |
| Monday Night | 50°F | Rain Showers Likely | 5 to 10 mph NE | 65% |
| Tuesday | 61°F | Chance Rain Showers | 5 to 10 mph NE | 49% |
| Tuesday Night | 48°F | Partly Cloudy | 5 mph NE | 8% |
| Wednesday | 64°F | Mostly Sunny | 5 mph NE | 2% |
| Wednesday Night | 51°F | Partly Cloudy | 0 to 5 mph NE | 2% |
| Thursday | 66°F | Partly Sunny | 0 mph | 10% |
| Thursday Night | 54°F | Slight Chance Rain Showers | 0 mph | 18% |
| Friday | 68°F | Partly Sunny | 0 mph | 12% |
| Friday Night | 55°F | Mostly Cloudy | 0 mph | 9% |
Forecast source: National Weather Service (api.weather.gov) for Onslow (42.107, -91.015). Updated through the day.
Growing snapshot for Onslow
Last spring frost
Apr 28
First fall frost
Oct 10
Growing season
164 days
Hardiness zone
5a
More local growing data for Onslow: nearby ZIP 52321 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Cascade, Ia (10.9 mi from Onslow). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.