Onslow, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Onslow, a city in Jones County, Iowa.
Today
83°F
Partly Sunny then Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 4pm. Partly sunny. High near 83, with temperatures falling to around 81 in the afternoon. Southwest wind 5 to 10 mph. Chance of precipitation is 30%.
7-day forecast for Onslow
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Partly Sunny then Chance Showers And Thunderstorms | 5 to 10 mph SW | 33% |
| Tonight | 64°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 mph N | 86% |
| Wednesday | 75°F | Showers And Thunderstorms Likely | 0 to 5 mph N | 70% |
| Wednesday Night | 58°F | Chance Showers And Thunderstorms | 0 to 5 mph N | 45% |
| Thursday | 79°F | Chance Rain Showers then Mostly Sunny | 0 mph | 25% |
| Thursday Night | 59°F | Mostly Clear | 0 mph | 3% |
| Friday | 81°F | Sunny | 0 to 5 mph S | 4% |
| Friday Night | 64°F | Mostly Clear | 0 to 5 mph S | 8% |
| Saturday | 85°F | Mostly Sunny | 5 mph S | 10% |
| Saturday Night | 69°F | Mostly Clear then Slight Chance Showers And Thunderstorms | 5 mph S | 24% |
| Sunday | 86°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 24% |
| Sunday Night | 68°F | Chance Showers And Thunderstorms | 5 mph S | 40% |
| Monday | 85°F | Chance Showers And Thunderstorms | 5 to 10 mph S | 40% |
| Monday Night | 68°F | Chance Showers And Thunderstorms | 5 to 10 mph E | 39% |
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 Aug 4, 2026.