Walnut, IA Weather & Growing Conditions
Overnight
67°F
Mostly Cloudy
Mostly cloudy. Low around 67, with temperatures rising to around 69 overnight. Southwest wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 67°F | Mostly Cloudy | 5 mph SW | 7% |
| Tuesday | 81°F | Slight Chance Showers And Thunderstorms | 3 to 13 mph N | 46% |
| Tuesday Night | 60°F | Patchy Smoke | 6 to 13 mph NNE | 90% |
| Wednesday | 72°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 9 mph NE | 55% |
| Wednesday Night | 55°F | Partly Cloudy | 1 to 7 mph ENE | 13% |
| Thursday | 80°F | Sunny | 1 to 6 mph ESE | 1% |
| Thursday Night | 61°F | Mostly Clear | 5 mph SE | 4% |
| Friday | 84°F | Sunny | 3 to 10 mph S | 4% |
| Friday Night | 67°F | Mostly Clear | 5 to 8 mph S | 7% |
| Saturday | 89°F | Sunny | 5 to 14 mph S | 3% |
| Saturday Night | 71°F | Mostly Clear | 14 mph S | 10% |
| Sunday | 89°F | Mostly Sunny | 10 to 15 mph S | 10% |
| Sunday Night | 71°F | Chance Showers And Thunderstorms | 15 mph SSE | 26% |
| Monday | 90°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 13 to 16 mph S | 23% |
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 Aug 4, 2026.