Walnut, IA Weather & Growing Conditions
Overnight
70°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely. Mostly cloudy. Low around 70, with temperatures rising to around 73 overnight. South southwest wind around 6 mph. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 70°F | Showers And Thunderstorms Likely | 6 mph SSW | 57% |
| Saturday | 79°F | Showers And Thunderstorms Likely | 5 to 8 mph W | 56% |
| Saturday Night | 60°F | Chance Showers And Thunderstorms | 7 to 10 mph N | 49% |
| Sunday | 64°F | Chance Rain Showers | 9 to 13 mph NNE | 42% |
| Sunday Night | 55°F | Chance Rain Showers | 8 to 12 mph NE | 37% |
| Monday | 59°F | Rain Showers Likely | 12 mph NE | 57% |
| Monday Night | 50°F | Chance Rain Showers then Mostly Cloudy | 5 to 10 mph ENE | 54% |
| Tuesday | 60°F | Partly Sunny | 8 mph ENE | 3% |
| Tuesday Night | 45°F | Partly Cloudy | 2 to 6 mph E | 1% |
| Wednesday | 63°F | Mostly Sunny | 5 mph ESE | 1% |
| Wednesday Night | 50°F | Partly Cloudy then Slight Chance Rain Showers | 3 mph ESE | 15% |
| Thursday | 64°F | Chance Rain Showers | 2 to 6 mph SE | 27% |
| Thursday Night | 55°F | Mostly Cloudy then Slight Chance Rain Showers | 5 mph SE | 21% |
| Friday | 66°F | Slight Chance Rain Showers | 3 to 7 mph ESE | 21% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Walnut, IA
Last spring frost
Apr 30
First fall frost
Oct 2
Growing season
153 days
Hardiness zone
5a
Explore more for Walnut, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Atlantic 1 Ne, Ia (10.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.