Onslow, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Onslow, a city in Jones County, Iowa.
Overnight
51°F
Mostly Cloudy
Mostly cloudy. Low around 51, with temperatures rising to around 54 overnight. South wind 5 to 10 mph.
7-day forecast for Onslow
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 51°F | Mostly Cloudy | 5 to 10 mph S | 12% |
| Wednesday | 55°F | Chance Rain Showers | 10 mph SW | 38% |
| Wednesday Night | 45°F | Chance Rain Showers | 10 mph SW | 25% |
| Thursday | 54°F | Rain Showers Likely | 5 to 10 mph W | 59% |
| Thursday Night | 40°F | Mostly Cloudy | 5 mph N | 13% |
| Friday | 49°F | Partly Sunny | 5 mph N | 2% |
| Friday Night | 30°F | Mostly Clear | 0 mph | 0% |
| Saturday | 51°F | Sunny | 0 to 5 mph NW | 1% |
| Saturday Night | 34°F | Mostly Clear | 0 to 5 mph W | 2% |
| Sunday | 56°F | Sunny | 5 mph W | 3% |
| Sunday Night | 35°F | Clear | 0 mph | 0% |
| Monday | 61°F | Sunny | 0 to 5 mph SW | 0% |
| Monday Night | 40°F | Mostly Clear | 0 to 5 mph W | 0% |
| Tuesday | 61°F | Sunny | 0 to 5 mph NW | 0% |
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 Nov 4, 2026.