Walnut, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Walnut, a city in Pottawattamie County, Iowa.
Today
79°F
Chance Rain Showers then Chance Showers And Thunderstorms
A chance of rain showers before 4pm, then a chance of showers and thunderstorms. Partly sunny. High near 79, with temperatures falling to around 76 in the afternoon. Northwest wind around 8 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Walnut
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 79°F | Chance Rain Showers then Chance Showers And Thunderstorms | 8 mph NW | 30% |
| Tonight | 60°F | Chance Showers And Thunderstorms | 8 to 12 mph N | 47% |
| Sunday | 64°F | Chance Rain Showers | 13 mph NNE | 41% |
| Sunday Night | 55°F | Chance Rain Showers | 12 mph NE | 37% |
| Monday | 59°F | Rain Showers Likely | 12 mph NE | 57% |
| Monday Night | 50°F | Chance Rain Showers then Mostly Cloudy | 6 to 10 mph NE | 53% |
| Tuesday | 59°F | Partly Sunny | 8 mph ENE | 3% |
| Tuesday Night | 46°F | Partly Cloudy | 2 to 7 mph E | 1% |
| Wednesday | 63°F | Mostly Sunny | 6 mph ESE | 1% |
| Wednesday Night | 51°F | Partly Cloudy then Slight Chance Rain Showers | 5 mph ESE | 16% |
| Thursday | 64°F | Chance Rain Showers | 3 to 7 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 | 5 to 8 mph ESE | 21% |
| Friday Night | 56°F | Slight Chance Rain Showers | 6 mph SE | 18% |
Forecast source: National Weather Service (api.weather.gov) for Walnut (41.489, -95.220). Updated through the day.
Growing snapshot for Walnut
Last spring frost
Apr 30
First fall frost
Oct 2
Growing season
153 days
Hardiness zone
5a
More local growing data for Walnut: nearby ZIP 51577 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Avoca
Bentley
Carson
Carter Lake
Council Bluffs
Crescent
Hancock
Macedonia
McClelland
Minden
Neola
Oakland
Treynor
Underwood
Weston
Climate data from the nearest NOAA station, Atlantic 1 Ne, Ia (10.8 mi from Walnut). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.