Castana, IA Weather & Growing Conditions
Today
73°F
Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms
A slight chance of rain showers before noon, then a slight chance of showers and thunderstorms between 4pm and 5pm. Mostly cloudy, with a high near 73. North northwest wind around 9 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 73°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 9 mph NNW | 17% |
| Tonight | 59°F | Cloudy | 9 mph N | 14% |
| Sunday | 63°F | Cloudy then Chance Rain Showers | 12 mph NE | 33% |
| Sunday Night | 55°F | Chance Rain Showers | 9 mph NE | 52% |
| Monday | 58°F | Rain Showers Likely | 9 mph ENE | 61% |
| Monday Night | 49°F | Chance Rain Showers then Mostly Cloudy | 3 to 8 mph ENE | 44% |
| Tuesday | 61°F | Partly Sunny | 7 mph E | 8% |
| Tuesday Night | 46°F | Partly Cloudy | 5 mph ESE | 1% |
| Wednesday | 64°F | Mostly Sunny | 6 mph SE | 3% |
| Wednesday Night | 51°F | Partly Cloudy then Chance Rain Showers | 5 mph SE | 30% |
| Thursday | 65°F | Chance Rain Showers | 7 mph SSE | 30% |
| Thursday Night | 55°F | Mostly Cloudy then Slight Chance Rain Showers | 5 mph SE | 15% |
| Friday | 68°F | Slight Chance Rain Showers then Mostly Cloudy | 7 mph SE | 15% |
| Friday Night | 56°F | Mostly Cloudy then Slight Chance Rain Showers | 6 mph SE | 22% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Castana, IA
Last spring frost
Apr 25
First fall frost
Oct 12
Growing season
170 days
Hardiness zone
5b
Explore more for Castana, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Castana Exp Farm, Ia (5.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.