Onslow, IA Weather & Growing Conditions
Today
83°F
Partly Sunny then Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 2pm. Partly sunny. High near 83, with temperatures falling to around 80 in the afternoon. Southwest wind 5 to 10 mph. Chance of precipitation is 30%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Partly Sunny then Chance Showers And Thunderstorms | 5 to 10 mph SW | 34% |
| Tonight | 64°F | Showers And Thunderstorms Likely | 5 mph N | 85% |
| 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 | 46% |
| Thursday | 79°F | Slight Chance Rain Showers then Mostly Sunny | 0 mph | 24% |
| Thursday Night | 59°F | Mostly Clear | 0 mph | 3% |
| Friday | 82°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 | 0 to 5 mph S | 10% |
| Saturday Night | 69°F | Partly Cloudy 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 | 69°F | Chance Showers And Thunderstorms | 5 to 10 mph E | 39% |
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 Aug 4, 2026.