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Duncan, MI Weather Forecast

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Overcast

57°F

Updated	8:44 pm
Feels Like	51°F
Humidity	76%
Wind	N 8 mph
Barometer	30.17 in
Dew Point	50°F

Overcast

14°C

Updated	8:44 pm
Feels Like	10°C
Humidity	76%
Wind	N 13 km/h
Barometer	102.1 kPa
Dew Point	10°C

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Cloud Cover	100%
uv UV Index	5
Sunrise	7:21 AM
Sunset	7:34 PM
Moonrise	5:18 PM
Moonset	1:45 AM

Civil Twilight
6:50 AM to 7:18 AM
7:34 PM to 8:02 PM
Duncan MI Weather - Waxing Gibbous Moon

Waxing Gibbous Moon

Duncan Weather Forecast

TONIGHT	TUESDAY	TUESDAY NIGHT	WEDNESDAY	WEDNESDAY NIGHT	THURSDAY	THURSDAY NIGHT	FRIDAY	FRIDAY NIGHT	SATURDAY	SATURDAY NIGHT	SUNDAY

Mostly Cloudy	Mostly Cloudy	Chance of Showers	Chance of Showers	Partly Cloudy	Clearing	Partly Cloudy	Clearing	Mostly Clear	Mostly Sunny	Partly Cloudy	Partly Cloudy
Lo: 50°FLo: 10°C	Hi: 65°FHi: 18°C	Lo: 51°FLo: 11°C	Hi: 61°FHi: 16°C	Lo: 51°FLo: 11°C	Hi: 65°FHi: 18°C	Lo: 49°FLo: 9°C	Hi: 65°FHi: 18°C	Lo: 45°FLo: 7°C	Hi: 69°FHi: 21°C	Lo: 49°FLo: 9°C	Hi: 69°FHi: 21°C
		POP: 70%	POP: 60%

POP = Probability of Precipitation.

Weather Outlook Updated: 321 PM EDT Mon Sep 21 2026 Duncan, MI Weather - WeatherWorld.com

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Meteorlogic Glosserator
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Issued: 733 PM EDT Mon Sep 21 2026

Key Messages

Extended stretch of seasonably cool conditions will exist into the middle of the week.
Aside from a low chance of rain early this week near the Ohio border, dry conditions are expected throughout the week.

Aviation

...

Deep layer of mid-level subsidence continues to sit atop a moist boundary layer augmented by Lake Huron moisture. While MVFR cloud trends observed earlier today have since lifted, there continues to be the potential for MVFR/low VFR cigs to mix in overnight and into Tuesd...

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Weather 101: Term of the Day

Rogue Wave

Commonly used term by mariners of a wave of an unexpected wave of much greater height or steepness than other waves in the prevailing sea or swell system. Rogue waves have been part of marine folklore for centuries. They are generally considered to be unexpectedly high waves which in some instances come from a direction different from the predominant waves in the local area. A single rogue wave has certainly been known to spell disaster for the mariner. They have, over the past twenty or thirty years, come to be recognized as unique phenomena albeit with several possible causes.,(1) Constructive interference. Several different wave trains of differing speeds and directions meet at the same time. The heights of the crests are additive so that an extreme wave may result when very high waves are included in the wave trains. The effect is normally short lived since the wave trains continue to separate and move on.,(2) Focusing of wave energy. When storm forced waves are developed in a water current counter to the wave direction an interaction can take place which results in a shortening of the wave frequency. The result is the superimposing of the wave trains and the generation of extreme waves. Examples of currents where these are sometimes seen are the Gulf Stream and Agulhas current. Extreme wave developed in this regime tend to be longer lived.,(3) Normal part of the wave spectrum. The generation of waves on water results not in a single wave height but in a spectrum of waves distributed from the smallest capillary waves to large waves indeed. Within this spectrum there is a finite possibility of each of the wave heights to occur with the largest waves being the least likely. The wave height most commonly observed and forecast is the significant wave height. This is defined as the average of the one third highest waves. The probability of encountering such a wave is about 1 in 10 while 1 in 1000 waves will be nearly double the significant wave height or higher. This is thought to be the source of at least some reports of rogue waves.