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Duncan, IA Weather Forecast
Duncan, IA Weather Forecast Dated: 429 AM Sun Sep 13 2026
Expect a mild stretch with a mix of sun and clouds and frequent chances of rain over the coming period. generally humid conditions and no major pressure swings will dominate.
Sunday, September 13, 2026
Mid-Morning
58°F 14°C
Overcast
Mid-Afternoon
63°F 17°C
Overcast
Early-Evening
61°F 16°C
Sunny
Refreshing around 63°F 17°C, overcast through the afternoon, turning sunny this evening, with steady humidity and steady pressure. Winds turning from the NE to the ESE at 9 mph 14 km/h.
Monday, September 14, 2026
Mid-Morning
54°F 12°C
Overcast
Mid-Afternoon
63°F 17°C
Light Showers
Early-Evening
65°F 18°C
Scattered Showers
Mildly cool near 63°F 17°C, scattered downpours possible, with increasing humidity and barometric pressure falling. Winds switching from the SE to the S at 14 mph 23 km/h. Gusts up to 29 mph 46 km/h.
Tuesday, September 15, 2026
Mid-Morning
58°F 15°C
Overcast
Mid-Afternoon
65°F 18°C
Overcast
Early-Evening
63°F 17°C
Overcast
Comfortable at 65°F 18°C, overcast throughout the day, with lower humidity and barometric pressure rising. Winds moving from the NNW to the NE at 5 mph 9 km/h.
Wednesday, September 16, 2026
Mid-Morning
56°F 13°C
Scattered Showers
Mid-Afternoon
61°F 16°C
Light Showers
Early-Evening
60°F 15°C
Overcast
Cool with a high near 61°F 16°C, periods of heavy rain and gusty conditions, with increasing humidity and steady pressure. Winds out of the SE at 9 mph 14 km/h.
Thursday, September 17, 2026
Mid-Morning
59°F 15°C
Fog
Mid-Afternoon
65°F 19°C
Scattered Showers
Early-Evening
65°F 19°C
Overcast
Refreshing around 65°F 19°C, scattered downpours possible, with lower humidity and steady pressure.
Friday, September 18, 2026
Mid-Morning
63°F 17°C
Light Fog
Mid-Afternoon
70°F 21°C
Scattered Showers
Early-Evening
67°F 19°C
Scattered Showers
Pleasant near 70°F 21°C, locally heavy downpours at times, with steady humidity and barometric pressure falling. Winds shifting from the E to the ESE at 10 mph 17 km/h. Gusts up to 20 mph 33 km/h.
Saturday, September 19, 2026
Mid-Morning
64°F 18°C
Scattered Showers
Mid-Afternoon
65°F 18°C
Scattered Showers
Early-Evening
57°F 14°C
Scattered Showers
Comfortable at 65°F 18°C, periods of heavy rain and gusty conditions, with steady humidity and steady pressure. Winds turning from the S to the NNE at 15 mph 23 km/h. Gusts up to 25 mph 40 km/h.
Sunday, September 20, 2026
Mid-Morning
59°F 15°C
Partly Cloudy
Mid-Afternoon
70°F 21°C
Sunny
Early-Evening
67°F 19°C
Cloudy
Enjoyable around 70°F 21°C, partly cloudy in the morning, becoming cloudy through the afternoon and evening, with lower humidity and steady pressure. Winds switching from the NE to the ENE at 10 mph 16 km/h.
Monday, September 21, 2026
Mid-Morning
57°F 14°C
Sunny
Mid-Afternoon
69°F 20°C
Sunny
Early-Evening
65°F 18°C
Sunny
Mild temperatures up to 69°F 20°C, sunny throughout the day, with steady humidity and steady pressure. Winds moving from the E to the ESE at 9 mph 14 km/h.
Tuesday, September 22, 2026
Mid-Morning
56°F 13°C
Light Fog
Mid-Afternoon
68°F 20°C
Sunny
Early-Evening
63°F 17°C
Sunny
Mild with a high of 68°F 20°C, sunny through the afternoon, turning partly cloudy this evening, with lower humidity and steady pressure. Winds ENE at 10 mph 17 km/h.
Wednesday, September 23, 2026
Mid-Morning
57°F 14°C
Light Fog
Mid-Afternoon
64°F 18°C
Partly Cloudy
Early-Evening
59°F 16°C
Scattered Showers
Comfortable at 64°F 18°C, scattered downpours possible, with steady humidity and steady pressure. Winds shifting from the ENE to the ESE at 9 mph 15 km/h.
Thursday, September 24, 2026
Mid-Morning
59°F 15°C
Light Showers
Mid-Afternoon
64°F 18°C
Scattered Showers
Early-Evening
67°F 20°C
Scattered Showers
Cool with a high near 64°F 18°C, locally heavy downpours at times, with steady humidity and steady pressure. Winds blowing from the S at 11 mph 18 km/h. Gusts up to 23 mph 37 km/h.
Friday, September 25, 2026
Mid-Morning
67°F 20°C
Sunny
Mid-Afternoon
82°F 28°C
Sunny
Early-Evening
78°F 26°C
Sunny
Quite warm around 82°F 28°C, sunny throughout the day, with lower humidity and steady pressure. Winds switching from the S to the SW at 10 mph 16 km/h.
Saturday, September 26, 2026
Mid-Morning
71°F 21°C
Sunny
Mid-Afternoon
82°F 28°C
Sunny
Early-Evening
78°F 26°C
Sunny
Warm temperatures up to 82°F 28°C, sunny throughout the day, with steady humidity and barometric pressure falling. Winds picking up from SE at 8 mph 13 km/h to SSE at 16 mph 26 km/h. Gusts up to 31 mph 50 km/h.
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