Observed 3:25 AM CDT at KUGN

McCullom Lake, IL weather

Clear and 54°12°, 11°6° warmer than a typical Oct 24.

Mostly agree

Now 54°12°

Clear

Wind: 5 mph7 km/h; From the south. 57–10 mph16 km/h through 3 PM
Dew point: 46°8°; Comfortable
UV index: 0Low; Moderate 12–4 PM · peak 3
Air quality: 78Moderate; Main pollutant: PM2.5 (fine particles)
Pressure: 30.34 inHg1027 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

Good hours for

Low 49°9° tonight at 4 AM
Above 60°16° today by 11 AM
High 70°21° today at 2 PM
Below 60°16° tonight after 8 PM

TonightNear 50°10° · Partly cloudy
This morningUp to 63°17° by 11 AM · Mostly cloudy
This afternoonNear 68°20° · Mostly cloudy
TonightDown to 51°11° by 4 AM · Mostly cloudy
Tomorrow morningUp to 65°18° by 11 AM · Mostly cloudy
Tomorrow afternoonUp to 74°23° by 4 PM · Partly cloudy
Tomorrow nightDown to 52°11° by 2 AM · Cloudy

Hourly forecast, next 48 hours, in the place's local time
Hour	Conditions	Temperature	Feels like	Precipitation	Wind	Humidity	Cloud cover	UV index
Sat 3a	Clear	50°10° (likely 49°9° to 51°11°)	49°9°	0%	5 mph8 km/h from SSE, gusts 7 mph11 km/h	82%	24%	0
Sat 4a	Mostly clear	49°9° (likely 48°9° to 50°10°)	48°9°	0%	5 mph8 km/h from SSE, gusts 7 mph11 km/h	83%	26%	0
Sat 5a	Partly cloudy	49°9° (likely 47°8° to 50°10°)	47°8°	0%	5 mph8 km/h from SSE, gusts 8 mph13 km/h	83%	36%	0
Sat 6a	Partly cloudy	49°9° (likely 47°8° to 49°9°)	47°8°	0%	5 mph8 km/h from SSE, gusts 8 mph12 km/h	82%	38%	0
Sat 7a	Partly sunny	49°9° (likely 46°8° to 50°10°)	47°8°	0%	5 mph8 km/h from SSE, gusts 8 mph12 km/h	86%	74%	0
Sat 8a	Cloudy	49°9° (likely 46°8° to 51°11°)	47°8°	0%	5 mph8 km/h from SSE, gusts 8 mph13 km/h	90%	80%	0
Sat 9a	Cloudy	53°12° (likely 52°11° to 54°12°)	53°12°	0%	5 mph8 km/h from S, gusts 11 mph17 km/h	81%	80%	1
Sat 10a	Cloudy	58°14° (likely 56°13° to 59°15°)	59°15°	0%	5 mph8 km/h from S, gusts 13 mph21 km/h	70%	81%	1
Sat 11a	Cloudy	63°17° (likely 60°16° to 63°17°)	63°17°	0%	10 mph16 km/h from S, gusts 15 mph24 km/h	62%	81%	2
Sat 12p	Cloudy	67°19° (likely 63°17° to 67°19°)	67°19°	0%	10 mph16 km/h from S, gusts 15 mph24 km/h	56%	81%	3
Sat 1p	Cloudy	68°20° (likely 65°18° to 68°20°)	69°21°	0%	10 mph16 km/h from S, gusts 14 mph23 km/h	52%	81%	3
Sat 2p	Cloudy	70°21° (likely 66°19° to 70°21°)	70°21°	0%	10 mph16 km/h from S, gusts 13 mph21 km/h	49%	78%	3
Sat 3p	Cloudy	70°21° (likely 67°19° to 70°21°)	70°21°	0%	10 mph16 km/h from S, gusts 13 mph21 km/h	48%	80%	3
Sat 4p	Cloudy	70°21° (likely 66°19° to 70°21°)	70°21°	0%	10 mph16 km/h from S, gusts 13 mph21 km/h	49%	75%	2
Sat 5p	Cloudy	68°20° (likely 64°18° to 68°20°)	68°20°	0%	10 mph16 km/h from S, gusts 13 mph21 km/h	53%	76%	1
Sat 6p	Cloudy	66°19° (likely 61°16° to 66°19°)	66°19°	5%	5 mph8 km/h from SSE, gusts 9 mph15 km/h	57%	78%	0
Sat 7p	Cloudy	61°16° (likely 59°15° to 61°16°)	61°16°	5%	5 mph8 km/h from SSE, gusts 9 mph15 km/h	67%	79%	0
Sat 8p	Partly cloudy	59°15° (likely 57°14° to 59°15°)	59°15°	5%	5 mph8 km/h from SSE, gusts 10 mph16 km/h	72%	54%	0
Sat 9p	Mostly cloudy	58°14° (likely 55°13° to 58°14°)	58°14°	5%	5 mph8 km/h from S, gusts 10 mph15 km/h	77%	37%	0
Sat 10p	Mostly cloudy	56°13° (likely 54°12° to 57°14°)	56°13°	5%	5 mph8 km/h from S, gusts 8 mph13 km/h	77%	57%	0
Sat 11p	Partly cloudy	55°13° (likely 53°12° to 56°13°)	55°13°	0%	5 mph8 km/h from S, gusts 9 mph15 km/h	77%	50%	0
Sun 12a	Partly cloudy	54°12° (likely 52°11° to 56°13°)	54°12°	5%	5 mph8 km/h from S, gusts 10 mph16 km/h	78%	48%	0
Sun 1a	Partly cloudy	54°12° (likely 51°11° to 55°13°)	54°12°	5%	5 mph8 km/h from S, gusts 10 mph17 km/h	77%	68%	0
Sun 2a	Partly cloudy	53°12° (likely 51°11° to 54°12°)	53°12°	5%	5 mph8 km/h from S, gusts 10 mph17 km/h	78%	84%	0
Sun 3a	Cloudy	52°11° (likely 50°10° to 53°12°)	52°11°	5%	5 mph8 km/h from S, gusts 11 mph17 km/h	78%	94%	0
Sun 4a	Cloudy	51°11° (likely 49°9° to 53°12°)	51°11°	5%	5 mph8 km/h from S, gusts 10 mph17 km/h	80%	90%	0
Sun 5a	Cloudy	51°11° (likely 48°9° to 54°12°)	51°11°	0%	5 mph8 km/h from SSW, gusts 10 mph17 km/h	80%	91%	0
Sun 6a	Cloudy	50°10° (likely 48°9° to 54°12°)	49°9°	0%	5 mph8 km/h from SSW, gusts 10 mph17 km/h	80%	90%	0
Sun 7a	Cloudy	50°10° (likely 48°9° to 54°12°)	49°9°	0%	5 mph8 km/h from SSW, gusts 10 mph16 km/h	83%	91%	0
Sun 8a	Cloudy	51°11° (likely 49°9° to 54°12°)	51°11°	0%	5 mph8 km/h from SSW, gusts 9 mph15 km/h	84%	93%	0
Sun 9a	Cloudy	55°13° (likely 53°12° to 57°14°)	55°13°	0%	5 mph8 km/h from SSW, gusts 9 mph15 km/h	77%	87%	1
Sun 10a	Partly sunny	60°16° (likely 59°15° to 62°17°)	61°16°	0%	5 mph8 km/h from SSW, gusts 13 mph21 km/h	66%	70%	2
Sun 11a	Mostly cloudy	65°18° (likely 63°17° to 66°19°)	65°18°	0%	5 mph8 km/h from SSW, gusts 14 mph22 km/h	58%	63%	2
Sun 12p	Mostly sunny	68°20° (likely 67°19° to 69°21°)	68°20°	0%	5 mph8 km/h from SSW, gusts 14 mph22 km/h	53%	33%	3
Sun 1p	Partly sunny	72°22° (likely 69°21° to 72°22°)	72°22°	0%	5 mph8 km/h from SSW, gusts 11 mph18 km/h	48%	20%	3
Sun 2p	Sunny	73°23° (likely 70°21° to 73°23°)	73°23°	0%	5 mph8 km/h from SSW, gusts 11 mph17 km/h	46%	22%	3
Sun 3p	Mostly sunny	73°23° (likely 70°21° to 73°23°)	73°23°	0%	5 mph8 km/h from SSW, gusts 10 mph15 km/h	45%	68%	2
Sun 4p	Cloudy	74°23° (likely 70°21° to 74°23°)	74°23°	0%	5 mph8 km/h from SSW, gusts 9 mph15 km/h	45%	68%	2
Sun 5p	Partly sunny	71°22° (likely 68°20° to 71°22°)	71°22°	0%	5 mph8 km/h from S, gusts 8 mph13 km/h	50%	73%	1
Sun 6p	Partly cloudy	68°20° (likely 63°17° to 68°20°)	68°20°	0%	5 mph8 km/h from S, gusts 5 mph7 km/h	55%	80%	0
Sun 7p	Cloudy	65°18° (likely 60°16° to 65°18°)	65°18°	0%	0 mph0 km/h, gusts 5 mph8 km/h	62%	86%	0
Sun 8p	Cloudy	60°16° (likely 58°14° to 60°16°)	60°16°	0%	0 mph0 km/h, gusts 8 mph13 km/h	73%	81%	0
Sun 9p	Cloudy	58°14° (likely 56°13° to 58°14°)	58°14°	0%	0 mph0 km/h, gusts 9 mph15 km/h	79%	86%	0
Sun 10p	Cloudy	56°13° (likely 55°13° to 56°13°)	56°13°	0%	0 mph0 km/h, gusts 10 mph17 km/h	81%	84%	0
Sun 11p	Cloudy	55°13° (likely 54°12° to 56°13°)	55°13°	0%	0 mph0 km/h, gusts 10 mph16 km/h	83%	90%	0
Mon 12a	Cloudy	54°12° (likely 53°12° to 56°13°)	54°12°	0%	0 mph0 km/h, gusts 9 mph15 km/h	85%	92%	0
Mon 1a	Cloudy	53°12° (likely 53°12° to 57°14°)	53°12°	0%	0 mph0 km/h, gusts 8 mph13 km/h	87%	91%	0
Mon 2a	Cloudy	52°11° (likely 50°10° to 58°14°)	52°11°	0%	0 mph0 km/h, gusts 4 mph6 km/h	89%	97%	0

Days ahead

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

Today, Oct 24. Cloudy. High 70°21°, low 49°9°. Typical 59°15° / 37°3°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 49°9°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 70°21°
  Dry
3. Evening
  6 PM–midnight
  Mostly cloudy, 59°15°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 51°11°
  Dry
Official NWS forecast
Today: Partly sunny. High near 70, with temperatures falling to around 68 in the afternoon. South southeast wind 5 to 10 mph.
Tonight: Mostly clear, with a low around 49. South southeast wind around 5 mph, with gusts as high as 10 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
67°19°–70°21°
Low, likely
46°8°–49°9°
Typical high / low
59°15° / 37°3°
Wind
10 mph15 km/h, gusts 17 mph27 km/h
UV peak
3
Tomorrow, Oct 25. Cloudy. High 74°23°, low 50°10°. Typical 59°15° / 36°2°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 51°11°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 74°23°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 60°16°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 52°11°
  Dry
Official NWS forecast
Day: Mostly sunny, with a high near 74. South southwest wind around 5 mph, with gusts as high as 10 mph.
Night: Mostly cloudy, with a low around 50. North wind 0 to 5 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
71°22°–74°23°
Low, likely
48°9°–52°11°
Typical high / low
59°15° / 36°2°
Wind
8 mph12 km/h, gusts 17 mph27 km/h
UV peak
3
Monday, Oct 26. Cloudy. High 64°18°, low 47°8°. Typical 58°14° / 36°2°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 53°12°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 64°18°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 52°11°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 50°10°
  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 47.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
61°16°–65°18°
Low, likely
47°8°–50°10°
Typical high / low
58°14° / 36°2°
Wind
12 mph20 km/h, gusts 20 mph32 km/h
UV peak
4
Tuesday, Oct 27. Mostly cloudy. High 65°18°, low 50°10°. Typical 58°14° / 36°2°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 52°11°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 66°19°
  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 65.
Night: Mostly cloudy, with a low around 50.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
64°18°–69°21°
Low, likely
48°9°–51°11°
Typical high / low
58°14° / 36°2°
Wind
10 mph16 km/h, gusts 29 mph47 km/h
UV peak
3
Wednesday, Oct 28. Partly sunny. High 72°22°, low 51°11°. Typical 57°14° / 36°2°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 55°13°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 70°21°
  Dry
3. Evening
  6 PM–midnight
  Clear, 61°16°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 57°14°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 72.
Night: Partly cloudy, with a low around 51.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
69°21°–72°22°
Low, likely
51°11°–55°13°
Typical high / low
57°14° / 36°2°
Wind
14 mph22 km/h, gusts 25 mph40 km/h
UV peak
4
Thursday, Oct 29. Partly sunny. High 68°20°, low 46°8°. Typical 57°14° / 35°2°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 57°14°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 68°20°
  Dry
3. Evening
  6 PM–midnight
  Mostly clear, 57°14°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 52°11°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 68.
Night: A slight chance of rain showers after 1am. Partly cloudy, with a low around 46.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
67°19°–72°22°
Low, likely
46°8°–56°13°
Typical high / low
57°14° / 35°2°
Wind
17 mph27 km/h, gusts 34 mph54 km/h
UV peak
3
Friday, Oct 30. Showers. High 66°19°, low 51°11°. Typical 56°13° / 35°2°. Rain 0.01 in0.3 mm, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 53°12°
  20% chance
2. Afternoon
  noon–6 PM
  Cloudy, 67°19°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 60°16°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 57°14°
  20% chance · 0.04 in0.9 mm
Hours this far out come from computer models only.
Official NWS forecast
Day: A slight chance of rain showers. Mostly sunny, with a high near 66.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
62°17°–75°24°
Low, likely
41°5°–59°15°
Typical high / low
56°13° / 35°2°
Wind
11 mph18 km/h, gusts 20 mph32 km/h
Saturday, Oct 31. Cloudy. High 68°20°, low 57°14°. Typical 56°13° / 35°2°. Rain 0.15 in3.8 mm, 40% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Drizzle, 59°15°
  30% chance · 0.01 in0.3 mm
2. Afternoon
  noon–6 PM
  Drizzle, 68°20°
  30% chance
3. Evening
  6 PM–midnight
  Rain, 62°17°
  40% chance · 0.08 in2 mm
4. Overnight
  midnight–6 AM
  Drizzle, 60°16°
  40% chance · 0.05 in1.1 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
62°17°–74°23°
Low, likely
55°13°–59°15°
Typical high / low
56°13° / 35°2°
Wind
14 mph22 km/h, gusts 30 mph49 km/h
UV peak
2
Sunday, Nov 1. Rain. High 65°18°, low 58°14°. Typical 55°13° / 34°1°. Rain 0.51 in13 mm, 50% chance. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 60°16°
  50% chance · 0.09 in2.3 mm
2. Afternoon
  noon–6 PM
  Rain, 63°17°
  40% chance · 0.27 in6.8 mm
3. Evening
  6 PM–midnight
  Drizzle, 61°16°
  40% chance · 0.15 in3.8 mm
4. Overnight
  midnight–6 AM
  Drizzle, 53°12°
  40% chance · 0.04 in0.9 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
63°17°–68°20°
Low, likely
55°13°–60°16°
Typical high / low
55°13° / 34°1°
Wind
25 mph41 km/h, gusts 42 mph67 km/h
UV peak
2
Monday, Nov 2. Cloudy. High 60°16°, low 48°9°. Typical 55°13° / 34°1°. Rain 0.27 in6.9 mm, 40% chance. Mostly agree.
1. Morning
  6 AM–noon
  Drizzle, 52°11°
  30% chance · 0.03 in0.9 mm
2. Afternoon
  noon–6 PM
  Cloudy, 53°11°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 46°8°
  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.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
57°14°–62°17°
Low, likely
40°4°–54°12°
Typical high / low
55°13° / 34°1°
Wind
20 mph32 km/h, gusts 45 mph73 km/h
UV peak
2

10 days15 days30 days

The outlook

Today
Dry, high 70°, low 49°.
Tomorrow
Dry, high 74°, low 50°, warming up.
Monday
Dry, high 64°, low 47°, cooling off.
Rest of week
Highs 60–72°; chance of precipitation on Sunday.

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

Fox River near Johnsburg

3.2 mi

Below flood stage

Level: 4.2 ft

Reading from Sat 1:45 AM · NWS gauge page

Boone Creek near Mchenry

3.4 mi

Below flood stage

Level: 1.1 ft
Flow: 12 cfs

Reading from Sat 1:45 AM · NWS gauge page

Nippersink Creek at Wonder Lake

3.9 mi

Below flood stage

Level: 5.0 ft
Flow: 40 cfs

Reading from Sat 1:45 AM · NWS gauge page

Fox River at McHenry (Stratton Lock and Dam) tailwater

4.7 mi

Below flood stage

Level: 1.2 ft
Flow: 629 cfs

Reading from Sat 1:15 AM · NWS gauge page

For your home

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

Heating this week

About 89% less heating than a typical week.

This week 14Typical 128

Heating degree days, base 65°F

Comfort

Dry air outside (dew point 46°F).

Open the windows?

Today, 11:00 AM–7:00 PM

Good stretch to open the windows.

Is this typical?

MCHENRY STRATTON LOCK/DAM · official normals 1991–2020 · records 1992–2026

Oct 24, today vs a typical year

Today’s expected high is 11°6° warmer than typical.

Last 7 days vs normal

On average 4°2° warmer than normal (daily mean temperature).

−3°−2°SunOct 18
+2°+1°MonOct 19
+6°+3°TueOct 20
+6°+3°WedOct 21
—ThuOct 22
+9°+5°FriOct 23
—SatOct 24

McCullom Lake weather by month: normals, records, snow and freeze dates

Sun & moon

Sun

Daylight: 10 h 40 min; Losing 2 min 35 s a day; shortest Dec 21, 1 h 36 min less
Golden hour: 5:18–6:14 PM; Morning 6:59–7:55 AM
Blue hour: 6:14–6:25 PM; Morning 6:48–6:59 AM; first light 6:48 AM

Stars tonight? Poor

Clouds most of the night (about 31% cover).

Moon

Waxing gibbous

96% lit · growing

Today: sets 5:29 AM · rises 4:55 PM
Full moon: Oct 25
New moon: Nov 9

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

McCullom Lake, IL weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Monday

Rest of week

What changed since yesterday

Radar

Rivers

Fox River near Johnsburg

Boone Creek near Mchenry

Nippersink Creek at Wonder Lake

Fox River at McHenry (Stratton Lock and Dam) tailwater

For your home

Heating this week

Comfort

Open the windows?

Is this typical?

Oct 24, today vs a typical year

Last 7 days vs normal

Sun & moon

Sun

Stars tonight? Poor

Moon