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Onslow, IA Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Onslow, a city in Jones County, Iowa.

Overnight
65°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 2am, then showers and thunderstorms. Mostly cloudy, with a low around 65. Southeast wind 5 to 10 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

7-day forecast for Onslow

WhenTempForecastWindPrecip
Overnight 65°F Chance Showers And Thunderstorms 5 to 10 mph SE 87%
Saturday 80°F Showers And Thunderstorms 5 mph S 79%
Saturday Night 62°F Showers And Thunderstorms 5 mph N 77%
Sunday 67°F Showers And Thunderstorms Likely 10 mph NE 65%
Sunday Night 55°F Rain Showers Likely 10 mph NE 59%
Monday 63°F Chance Rain Showers 10 mph NE 53%
Monday Night 50°F Chance Rain Showers 5 to 10 mph NE 53%
Tuesday 62°F Chance Rain Showers 5 to 10 mph NE 40%
Tuesday Night 47°F Partly Cloudy 5 mph NE 6%
Wednesday 66°F Mostly Sunny 5 mph NE 2%
Wednesday Night 50°F Partly Cloudy 0 to 5 mph NE 3%
Thursday 68°F Mostly Sunny 0 to 5 mph NE 6%
Thursday Night 52°F Partly Cloudy 0 mph 6%
Friday 69°F Mostly Sunny 0 to 5 mph NE 5%

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

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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 19, 2026.