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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.

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

WhenTempForecastWindPrecip
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

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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 20, 2026.