Dense Fog Advisory
Ends in 1 h 47 min
When
Until 9 AM CDT this morning.
Where
Lake IL County.
Issued for this forecast zone · National Weather Service Chicago IL
What, impacts and precautionsHide details
What
Visibility less than one mile 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: Lake
See it on weather.gov (opens in a new tab)

Observed 6:20 AM CDT at KPWK

Bannockburn, IL weather

Foggy and 45°7°, 10°6° warmer than a typical Oct 23.

Forecasts agree

Now 45°7°

Fog

Wind: Calm; Up to 5 mph8 km/h through 7 PM
Visibility: 0.5 mi0.8 km; Fog · under 1 mi1.6 km
Dew point: 45°7°; Comfortable
Humidity: 100%; Air 45°7°, dew point 45°7° · fog or dew likely
UV index: 0Low; Moderate 11 AM–4 PM · peak 4
Air quality: 85Moderate; Main pollutant: PM2.5 (fine particles)
Pressure: 30.32 inHg1027 hPa; Rising slowly · +0.02 inHg+0.8 hPa in 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

About the same as this time yesterday (46°8° then, 44°7° now)

Good hours for

Fog until 9 AM
Above 60°16° today by 10 AM
High 69°21° today at 1 PM
Below 60°16° tonight after 8 PM

This morningUp to 64°18° by 11 AM · Partly cloudy
This afternoonNear 67°19° · Clear
TonightDown to 51°11° by 5 AM · Partly cloudy
Tomorrow morningUp to 63°17° by 11 AM · Mostly cloudy
Tomorrow afternoonNear 66°19° · Mostly cloudy
Tomorrow nightDown to 53°12° by 5 AM · Mostly 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	50°10° (likely 48°9° to 51°11°)	50°10°	0%	0 mph0 km/h, gusts 5 mph8 km/h	92%	54%	0
Fri 8a	Fog	51°11° (likely 47°8° to 52°11°)	51°11°	0%	0 mph0 km/h, gusts 5 mph8 km/h	90%	56%	0
Fri 9a	Partly sunny	56°13° (likely 49°9° to 56°13°)	56°13°	0%	5 mph8 km/h from S, gusts 6 mph9 km/h	74%	51%	1
Fri 10a	Sunny	61°16° (likely 57°14° to 61°16°)	61°16°	0%	5 mph8 km/h from S, gusts 6 mph10 km/h	66%	18%	2
Fri 11a	Sunny	64°18° (likely 62°17° to 64°18°)	65°18°	0%	5 mph8 km/h from S, gusts 8 mph12 km/h	58%	0%	3
Fri 12p	Sunny	67°19° (likely 65°18° to 67°19°)	67°19°	0%	5 mph8 km/h from SSE, gusts 7 mph11 km/h	52%	0%	4
Fri 1p	Sunny	69°21° (likely 67°19° to 69°21°)	69°21°	0%	5 mph8 km/h from SE, gusts 8 mph13 km/h	49%	1%	4
Fri 2p	Sunny	69°21° (likely 66°19° to 70°21°)	69°21°	0%	5 mph8 km/h from SE, gusts 10 mph16 km/h	50%	2%	4
Fri 3p	Sunny	69°21° (likely 65°18° to 69°21°)	69°21°	0%	5 mph8 km/h from ESE, gusts 10 mph17 km/h	51%	3%	3
Fri 4p	Sunny	68°20° (likely 64°18° to 68°20°)	68°20°	0%	5 mph8 km/h from ESE, gusts 11 mph18 km/h	52%	5%	2
Fri 5p	Sunny	66°19° (likely 62°17° to 66°19°)	66°19°	0%	5 mph8 km/h from ESE, gusts 12 mph19 km/h	56%	6%	1
Fri 6p	Mostly clear	62°17° (likely 58°14° to 62°17°)	63°17°	0%	5 mph8 km/h from ESE, gusts 10 mph16 km/h	63%	16%	0
Fri 7p	Mostly clear	60°16° (likely 56°13° to 60°16°)	60°16°	0%	5 mph8 km/h from ESE, gusts 8 mph14 km/h	70%	51%	0
Fri 8p	Mostly clear	57°14° (likely 54°12° to 57°14°)	57°14°	0%	5 mph8 km/h from SE, gusts 9 mph15 km/h	77%	23%	0
Fri 9p	Mostly clear	57°14° (likely 53°12° to 57°14°)	57°14°	0%	5 mph8 km/h from SE, gusts 10 mph17 km/h	79%	23%	0
Fri 10p	Partly cloudy	56°13° (likely 53°12° to 56°13°)	56°13°	0%	5 mph8 km/h from SE, gusts 11 mph18 km/h	82%	32%	0
Fri 11p	Clear	55°13° (likely 53°12° to 56°13°)	55°13°	0%	5 mph8 km/h from SSE, gusts 13 mph21 km/h	82%	23%	0
Sat 12a	Partly cloudy	54°12° (likely 50°10° to 55°13°)	54°12°	0%	5 mph8 km/h from SSE, gusts 13 mph20 km/h	82%	45%	0
Sat 1a	Clear	54°12° (likely 49°9° to 55°13°)	54°12°	0%	5 mph8 km/h from SSE, gusts 13 mph21 km/h	80%	28%	0
Sat 2a	Partly cloudy	53°12° (likely 48°9° to 54°12°)	53°12°	0%	5 mph8 km/h from SSE, gusts 13 mph21 km/h	79%	50%	0
Sat 3a	Cloudy	52°11° (likely 47°8° to 53°12°)	53°12°	0%	5 mph8 km/h from SSE, gusts 12 mph19 km/h	80%	72%	0
Sat 4a	Partly cloudy	52°11° (likely 46°8° to 52°11°)	52°11°	0%	5 mph8 km/h from S, gusts 11 mph18 km/h	81%	68%	0
Sat 5a	Cloudy	51°11° (likely 46°8° to 51°11°)	51°11°	0%	5 mph8 km/h from S, gusts 11 mph17 km/h	83%	66%	0
Sat 6a	Cloudy	50°10° (likely 47°8° to 50°10°)	49°9°	0%	5 mph8 km/h from S, gusts 10 mph16 km/h	84%	72%	0
Sat 7a	Cloudy	50°10° (likely 46°8° to 51°11°)	48°9°	0%	5 mph8 km/h from S, gusts 10 mph16 km/h	86%	80%	0
Sat 8a	Cloudy	51°11° (likely 46°8° to 52°11°)	49°9°	0%	5 mph8 km/h from S, gusts 10 mph16 km/h	84%	80%	0
Sat 9a	Cloudy	56°13° (likely 52°11° to 56°13°)	56°13°	0%	5 mph8 km/h from S, gusts 11 mph18 km/h	76%	73%	1
Sat 10a	Cloudy	60°16° (likely 57°14° to 60°16°)	60°16°	0%	5 mph8 km/h from S, gusts 14 mph23 km/h	69%	74%	2
Sat 11a	Cloudy	63°17° (likely 60°16° to 63°17°)	63°17°	0%	10 mph16 km/h from S, gusts 14 mph22 km/h	63%	76%	3
Sat 12p	Cloudy	66°19° (likely 63°17° to 67°19°)	66°19°	0%	10 mph16 km/h from S, gusts 12 mph20 km/h	59%	71%	3
Sat 1p	Cloudy	67°19° (likely 65°18° to 68°20°)	67°19°	0%	10 mph16 km/h from S, gusts 12 mph19 km/h	56%	79%	3
Sat 2p	Cloudy	68°20° (likely 66°19° to 69°21°)	68°20°	0%	10 mph16 km/h from SSE, gusts 13 mph20 km/h	56%	79%	3
Sat 3p	Cloudy	68°20° (likely 67°19° to 69°21°)	69°21°	0%	10 mph16 km/h from SSE, gusts 13 mph21 km/h	55%	78%	2
Sat 4p	Cloudy	68°20° (likely 66°19° to 69°21°)	68°20°	0%	10 mph16 km/h from SSE, gusts 14 mph22 km/h	56%	77%	1
Sat 5p	Cloudy	66°19° (likely 65°18° to 67°19°)	66°19°	0%	10 mph16 km/h from SSE, gusts 12 mph20 km/h	58%	73%	1
Sat 6p	Cloudy	64°18° (likely 61°16° to 64°18°)	64°18°	0%	10 mph16 km/h from SSE, gusts 10 mph16 km/h	62%	69%	0
Sat 7p	Cloudy	62°17° (likely 59°15° to 62°17°)	62°17°	0%	5 mph8 km/h from SSE, gusts 9 mph15 km/h	66%	70%	0
Sat 8p	Cloudy	60°16° (likely 57°14° to 60°16°)	60°16°	0%	5 mph8 km/h from SSE, gusts 10 mph17 km/h	69%	67%	0
Sat 9p	Cloudy	58°14° (likely 57°14° to 59°15°)	58°14°	0%	5 mph8 km/h from S, gusts 12 mph19 km/h	71%	64%	0
Sat 10p	Cloudy	57°14° (likely 56°13° to 58°14°)	57°14°	0%	5 mph8 km/h from S, gusts 13 mph21 km/h	72%	78%	0
Sat 11p	Cloudy	57°14° (likely 56°13° to 58°14°)	57°14°	0%	5 mph8 km/h from S, gusts 12 mph20 km/h	72%	79%	0
Sun 12a	Cloudy	56°13° (likely 55°13° to 58°14°)	56°13°	0%	5 mph8 km/h from S, gusts 12 mph19 km/h	72%	77%	0
Sun 1a	Cloudy	55°13° (likely 54°12° to 58°14°)	55°13°	0%	5 mph8 km/h from S, gusts 11 mph18 km/h	72%	71%	0
Sun 2a	Cloudy	55°13° (likely 52°11° to 60°16°)	55°13°	0%	5 mph8 km/h from S, gusts 10 mph16 km/h	71%	73%	0
Sun 3a	Cloudy	54°12° (likely 50°10° to 59°15°)	54°12°	0%	5 mph8 km/h from SSW, gusts 10 mph16 km/h	72%	67%	0
Sun 4a	Partly cloudy	54°12° (likely 49°9° to 59°15°)	54°12°	0%	5 mph8 km/h from SSW, gusts 9 mph15 km/h	73%	66%	0
Sun 5a	Mostly cloudy	53°12° (likely 48°9° to 58°14°)	53°12°	0%	5 mph8 km/h from SSW, gusts 10 mph16 km/h	75%	68%	0
Sun 6a	Mostly cloudy	52°11° (likely 48°9° to 58°14°)	52°11°	0%	5 mph8 km/h from SSW, gusts 11 mph17 km/h	77%	67%	0

Days ahead

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

Today, Oct 23. Fog. High 69°21°, low 50°10°. Typical 59°15° / 42°6°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Partly sunny, 51°11°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 69°21°
  Dry
3. Evening
  6 PM–midnight
  Mostly clear, 57°14°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 51°11°
  Dry
Official NWS forecast
Today: Areas of fog before 9am. Sunny. High near 69, with temperatures falling to around 66 in the afternoon. Southeast wind 0 to 5 mph.
Tonight: Partly cloudy, with a low around 50. Southeast wind around 5 mph, with gusts as high as 10 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
67°19°–70°21°
Low, likely
44°7°–50°10°
Typical high / low
59°15° / 42°6°
Wind
8 mph13 km/h, gusts 18 mph29 km/h
UV peak
4
Tomorrow, Oct 24. Mostly cloudy. High 68°20°, low 52°11°. Typical 59°15° / 42°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 51°11°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 68°20°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 60°16°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 53°12°
  Dry
Official NWS forecast
Day: Partly sunny. High near 68, with temperatures falling to around 66 in the afternoon. South southeast wind 5 to 10 mph.
Night: Mostly cloudy, with a low around 52. South wind 5 to 10 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
67°19°–69°21°
Low, likely
46°8°–52°11°
Typical high / low
59°15° / 42°6°
Wind
8 mph13 km/h, gusts 18 mph29 km/h
UV peak
3
Sunday, Oct 25. Mostly cloudy. High 72°22°, low 52°11°. Typical 58°14° / 41°5°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Partly sunny, 54°12°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 70°21°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 61°16°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 53°12°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Partly sunny, with a high near 72. South southwest wind around 5 mph.
Night: Mostly cloudy, with a low around 52.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
70°21°–74°23°
Low, likely
50°10°–57°14°
Typical high / low
58°14° / 41°5°
Wind
8 mph12 km/h, gusts 16 mph26 km/h
UV peak
3
Monday, Oct 26. Mostly cloudy. High 64°18°, low 49°9°. Typical 58°14° / 41°5°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 54°12°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 63°17°
  Dry
3. Evening
  6 PM–midnight
  Mostly clear, 56°13°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 54°12°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly cloudy, with a high near 64.
Night: Mostly cloudy, with a low around 49.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
60°16°–65°18°
Low, likely
49°9°–53°12°
Typical high / low
58°14° / 41°5°
Wind
11 mph17 km/h, gusts 24 mph38 km/h
UV peak
3
Tuesday, Oct 27. Mostly cloudy. High 62°17°, low 49°9°. Typical 58°14° / 40°4°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 55°13°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 62°17°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 58°14°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 55°13°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly cloudy, with a high near 62.
Night: Mostly cloudy, with a low around 49.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
60°16°–64°18°
Low, likely
49°9°–56°13°
Typical high / low
58°14° / 40°4°
Wind
8 mph13 km/h, gusts 28 mph45 km/h
UV peak
3
Wednesday, Oct 28. Mostly cloudy. High 67°19°, low 50°10°. Typical 57°14° / 40°4°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Partly sunny, 56°13°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 67°20°
  Dry
3. Evening
  6 PM–midnight
  Clear, 61°16°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 58°14°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Partly sunny, with a high near 67.
Night: A slight chance of rain showers after 1am. Partly cloudy, with a low around 50.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
65°18°–71°22°
Low, likely
50°10°–56°13°
Typical high / low
57°14° / 40°4°
Wind
12 mph19 km/h, gusts 23 mph37 km/h
UV peak
3
Thursday, Oct 29. Showers. High 66°19°, low 46°8°. Typical 57°14° / 40°4°. Rain 0.05 in1.3 mm, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 58°14°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 62°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 52°11°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 44°7°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: A slight chance of rain showers. Partly sunny, with a high near 66.
Night: A chance of rain showers. Mostly cloudy, with a low around 46.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
59°15°–68°20°
Low, likely
46°8°–52°11°
Typical high / low
57°14° / 40°4°
Wind
14 mph22 km/h, gusts 37 mph59 km/h
UV peak
1
Friday, Oct 30. Sunny. High 57°14°, low 44°7°. Typical 56°13° / 39°4°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 44°7°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 54°12°
  Dry
3. Evening
  6 PM–midnight
  Clear, 47°8°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 42°6°
  20% chance · 0.05 in1.2 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
51°11°–65°18°
Low, likely
38°3°–51°11°
Typical high / low
56°13° / 39°4°
Wind
11 mph17 km/h, gusts 29 mph47 km/h
UV peak
2
Saturday, Oct 31. Drizzle. High 58°14°, low 45°7°. Typical 56°13° / 39°4°. Rain 0.12 in3 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 44°7°
  20% chance · 0.02 in0.5 mm
2. Afternoon
  noon–6 PM
  Cloudy, 56°13°
  30% chance
3. Evening
  6 PM–midnight
  Cloudy, 52°11°
  30% chance
4. Overnight
  midnight–6 AM
  Cloudy, 52°11°
  40% chance
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
53°12°–63°17°
Low, likely
34°1°–55°13°
Typical high / low
56°13° / 39°4°
Wind
11 mph17 km/h, gusts 20 mph33 km/h
UV peak
1
Sunday, Nov 1. Cloudy. High 63°17°, low 52°11°. Typical 55°13° / 39°4°. Rain 0.09 in2.3 mm, 40% chance. Mostly agree.
1. Morning
  6 AM–noon
  Partly sunny, 53°12°
  30% chance
2. Afternoon
  noon–6 PM
  Cloudy, 60°16°
  30% chance
3. Evening
  6 PM–midnight
  Cloudy, 56°13°
  20% chance
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
61°16°–65°18°
Low, likely
50°10°–54°12°
Typical high / low
55°13° / 39°4°
Wind
13 mph21 km/h, gusts 27 mph43 km/h
UV peak
3

10 days15 days30 days

The outlook

Today
Dry, high 69°, low 50°.
Tomorrow
Dry, high 68°, low 52°.
Sunday
Dry, high 72°, low 52°, warming up.
Rest of week
Mostly dry, highs 57–67°.

Want the meteorologists’ reasoning? Read the NWS forecast discussion (LOT) (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

Rivers

NOAA river gauges within 25 mi

West Fork North Branch Chicago River at Deerfield

1.8 mi

Below flood stage

Level: 7.2 ft

Reading from Fri 5:40 AM · NWS gauge page

Des Plaines River at Lincolnshire

2.6 mi

Below flood stage

Level: 7.2 ft
Flow: 175 cfs

Reading from Fri 4:45 AM · NWS gauge page

Skokie River at Lake Forest

3.1 mi

Below flood stage

Level: 2.0 ft
Flow: 2 cfs

Reading from Fri 5:40 AM · NWS gauge page

North Branch Chicago River at Deerfield

3.8 mi

Below flood stage

Level: 4.3 ft
Flow: 2 cfs

Reading from Fri 5:40 AM · NWS gauge page

For your home

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

Heating this week

About 88% less heating than a typical week.

This week 13Typical 109

Heating degree days, base 65°F

Comfort

Dry air outside (dew point 45°F).

Open the windows?

Today, 10:00 AM–7:00 PM

Good stretch to open the windows.

Is this typical?

Chicago Palwaukee Airport · official normals 1991–2020 · records 1996–2026

Oct 23, today vs a typical year

Today’s expected high is 10°6° warmer than typical.

Last 7 days vs normal

On average 2°1° warmer than normal (daily mean temperature).

−6°−3°SatOct 17
±0°SunOct 18
+1°±0°MonOct 19
+3°+1°TueOct 20
+5°+3°WedOct 21
+8°+4°ThuOct 22
—FriOct 23

Bannockburn weather by month: normals, records, snow and freeze dates

Sun & moon

Sun

Daylight: 10 h 44 min; Losing 2 min 35 s a day; shortest Dec 21, 1 h 38 min less
Golden hour: 5:18–6:14 PM; Morning 6:56–7:52 AM
Blue hour: 6:14–6:25 PM; Morning 6:45–6:56 AM; first light 6:45 AM

Stars tonight? Fair

Mostly clear 8–10 PM, but the moon is 95% lit and up.

Moon

Waxing gibbous

91% lit · growing

Today: sets 4:17 AM · rises 4:31 PM
Full moon: Oct 25
New moon: Nov 9

Looking east from Bannockburn. Open water to the 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

Bannockburn, IL weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Sunday

Rest of week

What changed since yesterday

Radar

Rivers

West Fork North Branch Chicago River at Deerfield

Des Plaines River at Lincolnshire

Skokie River at Lake Forest

North Branch Chicago River at Deerfield

For your home

Heating this week

Comfort

Open the windows?

Is this typical?

Oct 23, today vs a typical year

Last 7 days vs normal

Sun & moon

Sun

Stars tonight? Fair

Moon