Onslow, IA Weather & Growing Conditions
Tonight
51°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely. Mostly cloudy. Low around 51, with temperatures rising to around 53 overnight. South wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 70%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 51°F | Showers And Thunderstorms Likely | 10 to 15 mph S | 72% |
| Wednesday | 54°F | Chance Rain Showers | 15 mph SW | 41% |
| Wednesday Night | 44°F | Chance Rain Showers | 10 to 15 mph SW | 29% |
| Thursday | 53°F | Rain Showers Likely | 5 to 10 mph W | 60% |
| Thursday Night | 40°F | Slight Chance Rain Showers then Mostly Cloudy | 5 mph N | 22% |
| Friday | 51°F | Partly Sunny | 5 to 10 mph N | 8% |
| Friday Night | 33°F | Partly Cloudy | 0 mph | 0% |
| Saturday | 53°F | Mostly Sunny | 0 to 5 mph W | 1% |
| Saturday Night | 35°F | Mostly Clear | 0 to 5 mph W | 4% |
| Sunday | 58°F | Sunny | 5 mph NW | 12% |
| Sunday Night | 36°F | Mostly Clear | 0 to 5 mph W | 2% |
| Monday | 62°F | Sunny | 5 to 10 mph SW | 0% |
| Monday Night | 40°F | Mostly Clear | 5 mph W | 0% |
| Tuesday | 61°F | Sunny | 5 mph NW | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Onslow, IA
Last spring frost
Apr 28
First fall frost
Oct 10
Growing season
164 days
Hardiness zone
5a
Explore more for Onslow, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Cascade, Ia (10.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.