Dense Fog Advisory
Ends in 2 h 52 min
When
Until 10 AM EDT this morning.
Where
A portion of southeast Michigan.
Issued for this forecast zone · National Weather Service Detroit/Pontiac MI
What, impacts and precautionsHide details
What
Visibility one quarter mile or less in dense fog.
Impacts
Low visibility could make driving conditions hazardous.
Precautionary actions
If driving, slow down, use your headlights, and leave plenty of distance ahead of you.
Areas: Bay; Huron; Saginaw; Tuscola; Sanilac; Shiawassee; Genesee; Lapeer; St. Clair; Livingston; Oakland; Macomb; Washtenaw; Wayne; Monroe
See it on weather.gov (opens in a new tab)

Observed 6:25 AM EDT at KYIP

Ann Arbor, MI weather

Foggy and 48°9°.

Forecasts agree

Now 48°9°

Fog

Wind: 6 mph9 km/h; From the north-northeast. Up to 6 mph9 km/h through 7 PM
Visibility: 0.3 mi0.5 km; Fog · under 1 mi1.6 km
Dew point: 48°9°; Comfortable
Humidity: 100%; Air 48°9°, dew point 48°9° · fog or dew likely
UV index: 0Low; Moderate 12–4 PM · peak 3
Air quality: 73Moderate; Main pollutant: PM2.5 (fine particles)
Pressure: 30.35 inHg1028 hPa; Rising slowly · +0.02 inHg+0.5 hPa in 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

8°4° warmer than this time yesterday (41°5° then, 49°9° now)

Good hours for

Fog until 9 AM
Above 50°10° today by 10 AM
High 65°18° today at 4 PM
Fog tonight 2–9 AM
Fog tomorrow night from 3 AM

This morningUp to 54°12° by 11 AM · Mostly cloudy
This afternoonUp to 65°18° by 4 PM · Clear
TonightDown to 42°6° by 5 AM · Partly cloudy
Tomorrow morningUp to 55°13° by 11 AM · Mostly cloudy
Tomorrow afternoonUp to 65°18° by 3 PM · Partly cloudy
Tomorrow nightDown to 42°6° by 4 AM · Partly cloudy

Hourly forecast, next 48 hours, in the place's local time
Hour	Conditions	Temperature	Feels like	Precipitation	Wind	Humidity	Cloud cover	UV index
Fri 7a	Fog	45°7° (likely 44°7° to 48°9°)	45°7°	0%	2 mph3 km/h from NNE, gusts 7 mph11 km/h	98%	74%	0
Fri 8a	Fog	45°7° (likely 44°7° to 47°8°)	45°7°	0%	2 mph3 km/h from NE, gusts 5 mph8 km/h	97%	55%	0
Fri 9a	Partly sunny	46°8° (likely 46°8° to 47°8°)	46°8°	0%	2 mph3 km/h from NE, gusts 3 mph5 km/h	100%	69%	0
Fri 10a	Partly sunny	50°10° (likely 50°10° to 51°11°)	50°10°	0%	2 mph3 km/h from ENE, gusts 4 mph6 km/h	99%	64%	1
Fri 11a	Partly sunny	54°12° (likely 53°12° to 56°13°)	54°12°	0%	2 mph3 km/h from ENE, gusts 4 mph7 km/h	90%	42%	2
Fri 12p	Sunny	58°14° (likely 57°14° to 60°16°)	58°14°	0%	2 mph3 km/h from E, gusts 4 mph7 km/h	78%	10%	3
Fri 1p	Sunny	61°16° (likely 60°16° to 63°17°)	61°16°	0%	2 mph3 km/h from ENE, gusts 4 mph7 km/h	69%	5%	3
Fri 2p	Sunny	63°17° (likely 63°17° to 65°18°)	63°17°	0%	2 mph3 km/h from E, gusts 5 mph8 km/h	64%	8%	3
Fri 3p	Sunny	64°18° (likely 64°18° to 66°19°)	64°18°	0%	2 mph3 km/h from E, gusts 6 mph9 km/h	61%	5%	3
Fri 4p	Sunny	65°18° (likely 64°18° to 66°19°)	65°18°	0%	3 mph5 km/h from E, gusts 6 mph10 km/h	59%	10%	2
Fri 5p	Sunny	64°18° (likely 63°17° to 65°18°)	64°18°	0%	3 mph5 km/h from E, gusts 7 mph11 km/h	59%	5%	1
Fri 6p	Sunny	63°17° (likely 61°16° to 63°17°)	63°17°	0%	3 mph5 km/h from ESE, gusts 7 mph12 km/h	63%	4%	0
Fri 7p	Clear	59°15° (likely 56°13° to 59°15°)	59°15°	0%	5 mph8 km/h from ESE, gusts 7 mph12 km/h	72%	2%	0
Fri 8p	Clear	53°12° (likely 53°12° to 55°13°)	53°12°	0%	5 mph8 km/h from ESE, gusts 7 mph11 km/h	89%	0%	0
Fri 9p	Clear	50°10° (likely 50°10° to 52°11°)	50°10°	0%	3 mph5 km/h from ESE, gusts 9 mph15 km/h	97%	8%	0
Fri 10p	Clear	48°9° (likely 48°9° to 51°11°)	48°9°	0%	3 mph5 km/h from ESE, gusts 8 mph13 km/h	100%	8%	0
Fri 11p	Clear	47°8° (likely 47°8° to 50°10°)	46°8°	0%	3 mph5 km/h from ESE, gusts 7 mph11 km/h	100%	10%	0
Sat 12a	Clear	46°8° (likely 46°8° to 50°10°)	47°8°	0%	2 mph3 km/h from E, gusts 6 mph9 km/h	100%	35%	0
Sat 1a	Partly cloudy	45°7° (likely 45°7° to 50°10°)	45°7°	0%	2 mph3 km/h from E, gusts 6 mph9 km/h	100%	72%	0
Sat 2a	Fog	44°7° (likely 44°7° to 49°9°)	45°7°	0%	2 mph3 km/h from E, gusts 5 mph8 km/h	100%	60%	0
Sat 3a	Fog	44°7° (likely 44°7° to 47°8°)	44°7°	0%	2 mph3 km/h from E, gusts 4 mph6 km/h	100%	63%	0
Sat 4a	Fog	43°6° (likely 43°6° to 47°8°)	43°6°	0%	2 mph3 km/h from E, gusts 4 mph7 km/h	100%	67%	0
Sat 5a	Fog	42°6° (likely 42°6° to 46°8°)	43°6°	0%	2 mph3 km/h from ENE, gusts 4 mph6 km/h	100%	66%	0
Sat 6a	Fog	42°6° (likely 42°6° to 46°8°)	42°6°	0%	2 mph3 km/h from ENE, gusts 4 mph7 km/h	100%	67%	0
Sat 7a	Fog	41°5° (likely 41°5° to 45°7°)	41°5°	0%	1 mph2 km/h from ENE, gusts 4 mph7 km/h	100%	63%	0
Sat 8a	Fog	41°5° (likely 41°5° to 45°7°)	41°5°	0%	1 mph2 km/h from ENE, gusts 3 mph5 km/h	100%	63%	0
Sat 9a	Partly sunny	44°7° (likely 44°7° to 46°8°)	44°7°	0%	2 mph3 km/h from ENE, gusts 4 mph7 km/h	100%	63%	0
Sat 10a	Partly sunny	50°10° (likely 47°8° to 51°11°)	50°10°	0%	2 mph3 km/h from E, gusts 4 mph6 km/h	95%	65%	1
Sat 11a	Partly sunny	55°13° (likely 54°12° to 55°13°)	55°13°	0%	3 mph5 km/h from ESE, gusts 6 mph9 km/h	85%	42%	2
Sat 12p	Mostly sunny	59°15° (likely 57°14° to 60°16°)	59°15°	0%	3 mph5 km/h from ESE, gusts 7 mph11 km/h	73%	62%	3
Sat 1p	Partly sunny	62°17° (likely 60°16° to 63°17°)	62°17°	0%	3 mph5 km/h from SE, gusts 7 mph12 km/h	63%	57%	4
Sat 2p	Partly sunny	64°18° (likely 62°17° to 64°18°)	64°18°	0%	3 mph5 km/h from SE, gusts 8 mph13 km/h	59%	53%	4
Sat 3p	Partly sunny	65°18° (likely 63°17° to 65°18°)	65°18°	0%	3 mph5 km/h from SE, gusts 8 mph13 km/h	56%	51%	4
Sat 4p	Partly sunny	65°18° (likely 64°18° to 66°19°)	65°18°	0%	5 mph8 km/h from SE, gusts 8 mph13 km/h	56%	62%	3
Sat 5p	Sunny	65°18° (likely 63°17° to 65°18°)	65°18°	0%	5 mph8 km/h from SE, gusts 7 mph11 km/h	54%	26%	2
Sat 6p	Mostly sunny	63°17° (likely 60°16° to 63°17°)	63°17°	0%	5 mph8 km/h from SE, gusts 9 mph15 km/h	58%	48%	1
Sat 7p	Mostly clear	59°15° (likely 56°13° to 59°15°)	59°15°	0%	5 mph8 km/h from SE, gusts 9 mph15 km/h	66%	44%	0
Sat 8p	Clear	52°11° (likely 52°11° to 55°13°)	52°11°	0%	5 mph8 km/h from SE, gusts 10 mph16 km/h	82%	42%	0
Sat 9p	Clear	50°10° (likely 50°10° to 53°12°)	48°9°	0%	5 mph8 km/h from SE, gusts 9 mph14 km/h	90%	43%	0
Sat 10p	Clear	48°9° (likely 48°9° to 51°11°)	46°8°	0%	5 mph8 km/h from SSE, gusts 9 mph14 km/h	95%	2%	0
Sat 11p	Clear	47°8° (likely 47°8° to 50°10°)	46°8°	0%	3 mph5 km/h from SSE, gusts 7 mph12 km/h	96%	36%	0
Sun 12a	Clear	46°8° (likely 46°8° to 49°9°)	46°8°	0%	2 mph3 km/h from SSE, gusts 5 mph9 km/h	98%	34%	0
Sun 1a	Clear	45°7° (likely 45°7° to 49°9°)	45°7°	0%	1 mph2 km/h from S, gusts 5 mph8 km/h	100%	23%	0
Sun 2a	Clear	44°7° (likely 44°7° to 48°9°)	44°7°	0%	1 mph2 km/h from S, gusts 5 mph8 km/h	100%	18%	0
Sun 3a	Fog	43°6° (likely 43°6° to 49°9°)	43°6°	0%	1 mph2 km/h from S, gusts 3 mph6 km/h	100%	29%	0
Sun 4a	Fog	42°6° (likely 42°6° to 49°9°)	42°6°	0%	2 mph3 km/h from S, gusts 3 mph5 km/h	100%	33%	0
Sun 5a	Fog	42°6° (likely 42°6° to 48°9°)	42°6°	0%	2 mph3 km/h from S, gusts 3 mph5 km/h	100%	39%	0
Sun 6a	Fog	41°5° (likely 41°5° to 48°9°)	41°5°	0%	2 mph3 km/h from S, gusts 3 mph5 km/h	100%	41%	0

Days ahead

Shaded: typical range for these dates (1991–2020)

Today, Oct 23. Fog. High 65°18°, low 40°4°. Typical 61°16° / 41°5°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Partly sunny, 45°7°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 53°12°
  Dry
4. Overnight
  midnight–6 AM
  Fog, 42°6°
  Dry
Official NWS forecast
Today: Areas of fog before 9am. Mostly sunny, with a high near 65. East northeast wind around 3 mph.
Tonight: Patchy fog after 2am. Partly cloudy. Low around 40, with temperatures rising to around 42 overnight. East southeast wind around 5 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
64°18°–66°19°
Low, likely
40°4°–45°7°
Typical high / low
61°16° / 41°5°
Wind
6 mph10 km/h, gusts 13 mph20 km/h
UV peak
4
Tomorrow, Oct 24. Fog. High 65°18°, low 40°4°. Typical 60°16° / 41°5°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Partly sunny, 41°5°
  Dry
2. Afternoon
  noon–6 PM
  Partly sunny, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 52°11°
  Dry
4. Overnight
  midnight–6 AM
  Fog, 42°6°
  Dry
Official NWS forecast
Day: Patchy fog before 9am. Mostly sunny, with a high near 65. East southeast wind 1 to 5 mph.
Night: Patchy fog after 2am. Mostly clear, with a low around 40. South southeast wind 1 to 5 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
64°18°–66°19°
Low, likely
40°4°–45°7°
Typical high / low
60°16° / 41°5°
Wind
7 mph11 km/h, gusts 13 mph21 km/h
UV peak
4
Sunday, Oct 25. Fog. High 69°21°, low 46°8°. Typical 60°16° / 41°5°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Mostly sunny, 43°6°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 68°20°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 56°14°
  Dry
4. Overnight
  midnight–6 AM
  Mostly clear, 47°8°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Patchy fog before 9am. Mostly sunny, with a high near 69. South southwest wind 2 to 7 mph.
Night: Patchy fog after 2am. Partly cloudy, with a low around 46.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
67°19°–69°21°
Low, likely
40°4°–47°8°
Typical high / low
60°16° / 41°5°
Wind
10 mph15 km/h, gusts 15 mph25 km/h
UV peak
4
Monday, Oct 26. Cloudy. High 66°19°, low 42°6°. Typical 59°15° / 40°4°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Mostly sunny, 46°8°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 68°20°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 58°14°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 47°8°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Patchy fog before 9am. Mostly sunny, with a high near 66.
Night: Mostly cloudy, with a low around 42.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
65°18°–70°21°
Low, likely
42°6°–49°9°
Typical high / low
59°15° / 40°4°
Wind
10 mph16 km/h, gusts 16 mph26 km/h
UV peak
3
Tuesday, Oct 27. Cloudy. High 60°16°, low 41°5°. Typical 59°15° / 40°4°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 46°8°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 60°15°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 54°12°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 49°9°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly cloudy, with a high near 60.
Night: Mostly cloudy, with a low around 41.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
56°13°–63°17°
Low, likely
41°5°–47°8°
Typical high / low
59°15° / 40°4°
Wind
12 mph19 km/h, gusts 20 mph31 km/h
UV peak
3
Wednesday, Oct 28. Cloudy. High 64°18°, low 44°7°. Typical 59°15° / 40°4°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 49°9°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 67°20°
  Dry
3. Evening
  6 PM–midnight
  Clear, 57°14°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 52°11°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Partly sunny, with a high near 64.
Night: Partly cloudy, with a low around 44.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
64°18°–71°22°
Low, likely
44°7°–49°9°
Typical high / low
59°15° / 40°4°
Wind
10 mph16 km/h, gusts 20 mph32 km/h
UV peak
3
Thursday, Oct 29. Partly sunny. High 68°20°, low 43°6°. Typical 58°14° / 39°4°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Mostly sunny, 52°11°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 66°19°
  Dry
3. Evening
  6 PM–midnight
  Clear, 58°14°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 44°7°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 68.
Night: Partly cloudy, with a low around 43.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
61°16°–72°22°
Low, likely
43°6°–51°11°
Typical high / low
58°14° / 39°4°
Wind
15 mph24 km/h, gusts 28 mph44 km/h
UV peak
3
Friday, Oct 30. Cloudy. High 62°17°, low 44°7°. Typical 58°14° / 39°4°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 43°6°
  Dry
2. Afternoon
  noon–6 PM
  Partly sunny, 61°16°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 51°11°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 40°4°
  Dry
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
54°12°–72°22°
Low, likely
37°3°–54°12°
Typical high / low
58°14° / 39°4°
Wind
16 mph25 km/h, gusts 32 mph51 km/h
UV peak
3
Saturday, Oct 31. Rain. High 58°14°, low 42°6°. Typical 57°14° / 39°4°. Rain 0.23 in5.8 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 40°4°
  Dry
2. Afternoon
  noon–6 PM
  Drizzle, 55°13°
  Dry
3. Evening
  6 PM–midnight
  Clear, 49°10°
  30% chance · 0.08 in1.9 mm
4. Overnight
  midnight–6 AM
  Rain, 47°8°
  40% chance · 0.1 in2.5 mm
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
50°10°–64°18°
Low, likely
30°−1°–55°13°
Typical high / low
57°14° / 39°4°
Wind
13 mph21 km/h, gusts 27 mph44 km/h
Sunday, Nov 1. Rain. High 61°16°, low 50°10°. Typical 57°14° / 38°3°. Rain 0.26 in6.6 mm, 40% chance. Mostly agree.
1. Morning
  6 AM–noon
  Drizzle, 48°9°
  40% chance · 0.03 in0.8 mm
2. Afternoon
  noon–6 PM
  Drizzle, 58°14°
  40% chance
3. Evening
  6 PM–midnight
  Drizzle, 52°11°
  30% chance · 0.02 in0.5 mm
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
59°15°–63°17°
Low, likely
43°6°–54°12°
Typical high / low
57°14° / 38°3°
Wind
14 mph22 km/h, gusts 33 mph53 km/h

10 days15 days30 days

The outlook

Today
Dry, high 65°, low 40°.
Tomorrow
Dry, high 65°, low 40°.
Sunday
Dry, high 69°, low 46°, warming up.
Rest of week
Highs 58–68°; chance of precipitation on Sunday.

Want the meteorologists’ reasoning? Read the NWS forecast discussion (DTX) (opens in a new tab)

What changed since yesterday

No meaningful changes from yesterday’s forecast.

Radar

Radar data: NOAA MRMS, rendered by forecast.blue

Radar loads when scrolled into view

Full-screen radar

For your home

What this week’s weather means for heating, cooling, pipes and fresh air.

Heating this week

About 75% less heating than a typical week.

This week 26Typical 106

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 21
h below 17°F: 0
h below 5°F: 0

47, 17 and 5°F are the test points heat pumps are rated at. About 7 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 48°F).

Open the windows?

Today, 1:00 PM–6:00 PM

Good stretch to open the windows.

Is this typical?

Detroit Willow Run Airport · official normals 1991–2020 · records 1891–2026

Oct 23, today vs a typical year

Today’s expected high is 4°2° warmer than typical.

Last 7 days vs normal

On average 1° colder than normal (daily mean temperature).

−9°−5°SatOct 17
−3°−2°SunOct 18
—MonOct 19
+1°TueOct 20
+1°WedOct 21
+4°+2°ThuOct 22
—FriOct 23

Ann Arbor weather by month: normals, records, snow and freeze dates

Sun & moon

Sun

Daylight: 10 h 43 min; Losing 2 min 39 s a day; shortest Dec 21, 1 h 38 min less
Golden hour: 6:01–6:58 PM; Morning 7:39–8:36 AM
Blue hour: 6:58–7:09 PM; Morning 7:28–7:39 AM; first light 7:28 AM

Stars tonight? Unknown

Cloud forecast not available for tonight.

Moon

Waxing gibbous

91% lit · growing

Today: sets 4:59 AM · rises 5:14 PM
Full moon: Oct 26
New moon: Nov 9

Looking west from Ann Arbor. A level horizon.Skyline from USGS elevation data, heights drawn up to 6× taller. Sky, sun and moon as they are now.

1 active weather alert

Dense Fog Advisory