Duncan, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Duncan, a community in Hancock County, Iowa.
This Afternoon
59°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely. Cloudy. High near 59, with temperatures falling to around 56 in the afternoon. North wind around 12 mph. Chance of precipitation is 70%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Duncan
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 59°F | Showers And Thunderstorms Likely | 12 mph N | 70% |
| Tonight | 43°F | Rain Showers | 12 mph NW | 93% |
| Wednesday | 49°F | Rain Showers | 13 to 18 mph W | 88% |
| Wednesday Night | 39°F | Rain Showers | 12 to 15 mph WNW | 91% |
| Thursday | 49°F | Rain Showers Likely | 15 mph NNW | 61% |
| Thursday Night | 33°F | Slight Chance Rain Showers then Mostly Cloudy | 5 to 12 mph N | 15% |
| Friday | 47°F | Mostly Sunny | 2 to 6 mph N | 0% |
| Friday Night | 29°F | Partly Cloudy | 1 mph NNE | 1% |
| Saturday | 53°F | Mostly Sunny | 1 to 6 mph SW | 2% |
| Saturday Night | 33°F | Partly Cloudy | 5 mph W | 4% |
| Sunday | 57°F | Sunny | 5 to 8 mph W | 6% |
| Sunday Night | 35°F | Mostly Clear | 7 mph SW | 1% |
| Monday | 61°F | Sunny | 7 to 12 mph WSW | 0% |
| Monday Night | 37°F | Mostly Clear | 6 mph WNW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Duncan (43.108, -93.702). Updated through the day.
Growing snapshot for Duncan
Last spring frost
Apr 29
First fall frost
Oct 7
Growing season
161 days
Hardiness zone
5a
More local growing data for Duncan: nearby ZIP 50438 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Britt 3E, Ia (6.4 mi from Duncan). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.