Duncan, IA Weather Forecast
Local 7-day forecast
Mostly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Duncan, IA in one place.
Mostly sunny. High near 68, with temperatures falling to around 66 in the afternoon. East wind 6 to 10 mph. New rainfall amounts less than a tenth of an inch possible.
Local Weather Overview
This forecast page for Duncan, IA is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Sep 15, 2026 1:32 PM CDT.
The active forecast window currently covers Sep 16 to Sep 21, 2026 for Duncan, IA.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Sep 16 to Sep 21, 2026
- Latest sync
- Sep 15, 2026 1:32 PM CDT
- Forecast office
- DMX
- Source
- NOAA / NWS
Daily Outlook
This Week in Duncan
Friday looks like the warmest upcoming period in Duncan at 75 degrees F.
Monday Night is the coolest period ahead with temperatures near 48 degrees F.
The strongest winds are forecast for Friday at about 12 to 17 mph SE.
Precipitation is mentioned in 10 upcoming forecast periods.
Forecast Details
- Last updated
- Sep 15, 2026 1:32 PM CDT
- Coverage
- 6 days
- Time zone
- America/Chicago
- Forecast office
- DMX
- Radar station
- KDMX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
A chance of rain showers. Mostly cloudy. Low around 57, with temperatures rising to around 60 overnight. South southeast wind 1 to 7 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
A chance of rain showers. Mostly cloudy, with a high near 74. North northeast wind 1 to 5 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
A chance of rain showers before 10pm, then showers and thunderstorms likely. Mostly cloudy, with a low around 58. Chance of precipitation is 70%. New rainfall amounts between three quarters and one inch possible.
Showers and thunderstorms. Mostly cloudy, with a high near 75. Chance of precipitation is 90%.
Showers and thunderstorms. Mostly cloudy, with a low around 61. Chance of precipitation is 90%.
Showers and thunderstorms. Mostly cloudy, with a high near 74. Chance of precipitation is 90%.
A chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 54. Chance of precipitation is 30%.
A slight chance of rain showers after 7am. Partly sunny, with a high near 67.
A slight chance of rain showers before 7pm. Partly cloudy, with a low around 49.
Mostly sunny, with a high near 68.
Partly cloudy, with a low around 48.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Wednesday
Sep 16
|
Mostly Sunny
|
68°F |
6 to 10 mph
E
|
|
Wednesday Night
Sep 16
|
Chance Rain Showers
|
57°F |
1 to 7 mph
SSE
|
|
Thursday
Sep 17
|
Chance Rain Showers
|
74°F |
1 to 5 mph
NNE
|
|
Thursday Night
Sep 17
|
Showers And Thunderstorms Likely
|
58°F |
5 to 12 mph
E
|
|
Friday
Sep 18
|
Showers And Thunderstorms
|
75°F |
12 to 17 mph
SE
|
|
Friday Night
Sep 18
|
Showers And Thunderstorms
|
61°F |
14 to 17 mph
S
|
|
Saturday
Sep 19
|
Showers And Thunderstorms
|
74°F |
14 mph
WNW
|
|
Saturday Night
Sep 19
|
Chance Showers And Thunderstorms
|
54°F |
6 to 10 mph
N
|
|
Sunday
Sep 20
|
Slight Chance Rain Showers
|
67°F |
7 to 10 mph
NNE
|
|
Sunday Night
Sep 20
|
Slight Chance Rain Showers then Partly Cloudy
|
49°F |
3 to 8 mph
NE
|
|
Monday
Sep 21
|
Mostly Sunny
|
68°F |
3 to 7 mph
NE
|
|
Monday Night
Sep 21
|
Partly Cloudy
|
48°F |
5 mph
E
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Duncan.