Observed 4:35 AM CDT at KALN

Pontoon Beach, IL weather

Clear and 47°8°, 13°7° warmer than a typical Oct 24.

Mostly agree

Now 47°8°

Clear

Wind: Calm; Up to 5 mph8 km/h through 4 PM
Dew point: 45°7°; Comfortable
Humidity: 80%; Air 47°8°, dew point 45°7° · fog or dew likely
UV index: 0Low; Moderate 11 AM–4 PM · peak 4
Air quality: 64Moderate; Main pollutant: PM2.5 (fine particles)

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

About the same as this time yesterday (47°8° then, 47°8° now)

Good hours for

Above 60°16° today by 10 AM
High 77°25° today at 4 PM
Drops 12°7° tonight 6–9 PM (72°22° → 60°16°)
Below 60°16° tonight after 9 PM
Drops 12°7° tomorrow night 6–9 PM (74°23° → 62°17°)

TonightNear 50°10° · Clear
This morningUp to 67°19° by 11 AM · Partly cloudy
This afternoonUp to 77°25° by 4 PM · Mostly cloudy
TonightDown to 50°10° by 4 AM · Partly cloudy
Tomorrow morningUp to 69°21° by 11 AM · Mostly cloudy
Tomorrow afternoonUp to 79°26° by 4 PM · Mostly cloudy
Tomorrow nightDown to 54°12° by 3 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
Sat 4a	Clear	51°11° (likely 49°9° to 52°11°)	51°11°	0%	2 mph3 km/h from SE, gusts 7 mph11 km/h	80%	18%	0
Sat 5a	Clear	49°9° (likely 48°9° to 51°11°)	49°9°	0%	2 mph3 km/h from E, gusts 6 mph9 km/h	86%	20%	0
Sat 6a	Clear	48°9° (likely 47°8° to 50°10°)	48°9°	0%	2 mph3 km/h from E, gusts 4 mph7 km/h	86%	33%	0
Sat 7a	Mostly sunny	47°8° (likely 46°8° to 50°10°)	47°8°	0%	2 mph3 km/h from E, gusts 6 mph10 km/h	89%	27%	0
Sat 8a	Sunny	51°11° (likely 47°8° to 52°11°)	51°11°	0%	3 mph5 km/h from E, gusts 6 mph10 km/h	86%	30%	0
Sat 9a	Partly sunny	54°12° (likely 54°12° to 56°13°)	54°12°	0%	3 mph5 km/h from SE, gusts 7 mph11 km/h	83%	47%	1
Sat 10a	Partly sunny	62°17° (likely 59°15° to 62°17°)	62°17°	0%	5 mph8 km/h from SE, gusts 10 mph17 km/h	67%	70%	2
Sat 11a	Partly sunny	67°19° (likely 64°18° to 67°19°)	67°19°	0%	5 mph8 km/h from SE, gusts 10 mph16 km/h	56%	74%	3
Sat 12p	Partly sunny	71°22° (likely 67°19° to 71°22°)	71°22°	0%	5 mph8 km/h from SE, gusts 9 mph14 km/h	46%	75%	4
Sat 1p	Partly sunny	74°23° (likely 70°21° to 74°23°)	74°23°	0%	5 mph8 km/h from SE, gusts 7 mph12 km/h	40%	75%	4
Sat 2p	Cloudy	75°24° (likely 72°22° to 75°24°)	75°24°	0%	5 mph8 km/h from SE, gusts 7 mph11 km/h	38%	77%	4
Sat 3p	Partly sunny	76°24° (likely 73°23° to 76°24°)	76°24°	0%	3 mph5 km/h from SE, gusts 8 mph12 km/h	37%	31%	3
Sat 4p	Cloudy	77°25° (likely 72°22° to 77°25°)	77°25°	0%	3 mph5 km/h from SE, gusts 8 mph13 km/h	35%	74%	2
Sat 5p	Partly sunny	75°24° (likely 70°21° to 75°24°)	75°24°	0%	3 mph5 km/h from SE, gusts 9 mph14 km/h	38%	56%	1
Sat 6p	Partly cloudy	72°22° (likely 66°19° to 72°22°)	72°22°	0%	3 mph5 km/h from SE, gusts 7 mph10 km/h	43%	49%	0
Sat 7p	Mostly clear	67°19° (likely 63°17° to 67°19°)	67°19°	0%	3 mph5 km/h from E, gusts 6 mph10 km/h	50%	44%	0
Sat 8p	Clear	60°16° (likely 60°16° to 62°17°)	60°16°	0%	3 mph5 km/h from SE, gusts 6 mph10 km/h	64%	41%	0
Sat 9p	Clear	58°14° (likely 58°14° to 61°16°)	58°14°	0%	2 mph3 km/h from SE, gusts 7 mph12 km/h	69%	40%	0
Sat 10p	Clear	57°14° (likely 57°14° to 59°15°)	57°14°	0%	2 mph3 km/h from SE, gusts 10 mph16 km/h	72%	40%	0
Sat 11p	Clear	55°13° (likely 55°13° to 58°14°)	55°13°	0%	2 mph3 km/h from SE, gusts 9 mph15 km/h	74%	42%	0
Sun 12a	Mostly clear	55°13° (likely 55°13° to 57°14°)	55°13°	0%	2 mph3 km/h from SE, gusts 9 mph15 km/h	72%	18%	0
Sun 1a	Partly cloudy	53°12° (likely 53°12° to 56°13°)	53°12°	0%	2 mph3 km/h from SE, gusts 8 mph14 km/h	77%	34%	0
Sun 2a	Mostly clear	52°11° (likely 52°11° to 55°13°)	52°11°	0%	1 mph2 km/h from SE, gusts 7 mph12 km/h	80%	43%	0
Sun 3a	Mostly clear	51°11° (likely 51°11° to 53°12°)	51°11°	0%	1 mph2 km/h from SE, gusts 6 mph10 km/h	83%	47%	0
Sun 4a	Partly cloudy	50°10° (likely 50°10° to 52°11°)	50°10°	0%	1 mph2 km/h from SE, gusts 6 mph9 km/h	86%	36%	0
Sun 5a	Partly cloudy	50°10° (likely 50°10° to 52°11°)	50°10°	0%	1 mph2 km/h from SE, gusts 5 mph8 km/h	86%	45%	0
Sun 6a	Mostly clear	49°9° (likely 49°9° to 51°11°)	49°9°	0%	1 mph2 km/h from SE, gusts 5 mph8 km/h	86%	59%	0
Sun 7a	Partly sunny	49°9° (likely 49°9° to 51°11°)	49°9°	0%	1 mph2 km/h from SE, gusts 5 mph8 km/h	86%	60%	0
Sun 8a	Partly sunny	50°10° (likely 49°9° to 52°11°)	50°10°	0%	1 mph2 km/h from SE, gusts 5 mph8 km/h	86%	55%	0
Sun 9a	Cloudy	55°13° (likely 55°13° to 57°14°)	55°13°	0%	2 mph3 km/h from SE, gusts 5 mph8 km/h	83%	64%	1
Sun 10a	Cloudy	63°17° (likely 60°16° to 64°18°)	63°17°	0%	2 mph3 km/h from SE, gusts 6 mph10 km/h	67%	78%	2
Sun 11a	Cloudy	69°21° (likely 65°18° to 70°21°)	69°21°	0%	2 mph3 km/h from S, gusts 6 mph10 km/h	55%	76%	3
Sun 12p	Partly sunny	73°23° (likely 69°21° to 74°23°)	73°23°	0%	2 mph3 km/h from S, gusts 6 mph9 km/h	48%	73%	4
Sun 1p	Cloudy	76°24° (likely 72°22° to 76°24°)	76°24°	0%	2 mph3 km/h from S, gusts 5 mph7 km/h	42%	77%	4
Sun 2p	Cloudy	77°25° (likely 73°23° to 78°26°)	77°25°	0%	2 mph3 km/h from S, gusts 4 mph6 km/h	40%	79%	4
Sun 3p	Cloudy	78°26° (likely 74°23° to 79°26°)	78°26°	0%	2 mph3 km/h from S, gusts 4 mph6 km/h	39%	80%	3
Sun 4p	Cloudy	79°26° (likely 74°23° to 79°26°)	79°26°	0%	2 mph3 km/h from S, gusts 4 mph7 km/h	36%	79%	2
Sun 5p	Cloudy	77°25° (likely 73°23° to 77°25°)	77°25°	0%	1 mph2 km/h from SE, gusts 5 mph8 km/h	42%	75%	1
Sun 6p	Cloudy	74°23° (likely 68°20° to 74°23°)	74°23°	0%	0 mph0 km/h, gusts 5 mph9 km/h	44%	81%	0
Sun 7p	Cloudy	69°21° (likely 65°18° to 69°21°)	69°21°	0%	1 mph2 km/h from SE, gusts 6 mph10 km/h	53%	81%	0
Sun 8p	Cloudy	62°17° (likely 62°17° to 66°19°)	62°17°	0%	1 mph2 km/h from SE, gusts 6 mph9 km/h	67%	79%	0
Sun 9p	Cloudy	59°15° (likely 59°15° to 63°17°)	59°15°	0%	1 mph2 km/h from SE, gusts 6 mph10 km/h	75%	77%	0
Sun 10p	Cloudy	59°15° (likely 59°15° to 62°17°)	59°15°	0%	1 mph2 km/h from SE, gusts 6 mph10 km/h	75%	80%	0
Sun 11p	Cloudy	58°14° (likely 58°14° to 62°17°)	58°14°	0%	1 mph2 km/h from S, gusts 6 mph10 km/h	77%	84%	0
Mon 12a	Cloudy	57°14° (likely 57°14° to 62°17°)	57°14°	0%	1 mph2 km/h from S, gusts 6 mph9 km/h	77%	86%	0
Mon 1a	Cloudy	56°13° (likely 56°13° to 62°17°)	56°13°	0%	1 mph2 km/h from S, gusts 5 mph8 km/h	80%	89%	0
Mon 2a	Cloudy	55°13° (likely 55°13° to 65°18°)	55°13°	0%	1 mph2 km/h from S, gusts 4 mph6 km/h	83%	91%	0
Mon 3a	Cloudy	54°12° (likely 54°12° to 65°18°)	54°12°	0%	0 mph0 km/h, gusts 3 mph5 km/h	83%	93%	0

Days ahead

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

Today, Oct 24. Cloudy. High 77°25°, low 47°8°. Typical 64°18° / 45°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Partly sunny, 51°11°
  Dry
2. Afternoon
  noon–6 PM
  Partly sunny, 77°25°
  Dry
3. Evening
  6 PM–midnight
  Clear, 60°16°
  Dry
4. Overnight
  midnight–6 AM
  Mostly clear, 50°10°
  Dry
Official NWS forecast
Today: Mostly sunny, with a high near 77. Southeast wind around 5 mph.
Tonight: Clear, with a low around 47. Southeast wind around 2 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
73°23°–77°25°
Low, likely
46°8°–50°10°
Typical high / low
64°18° / 45°7°
Wind
8 mph12 km/h, gusts 15 mph23 km/h
UV peak
4
Tomorrow, Oct 25. Cloudy. High 79°26°, low 52°11°. Typical 64°18° / 44°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 50°10°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 79°26°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 62°17°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 54°12°
  Dry
Official NWS forecast
Day: Mostly sunny, with a high near 79. Southeast wind around 2 mph.
Night: Mostly cloudy, with a low around 52. Southeast wind around 1 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
75°24°–79°26°
Low, likely
49°9°–52°11°
Typical high / low
64°18° / 44°7°
Wind
6 mph9 km/h, gusts 14 mph22 km/h
UV peak
4
Monday, Oct 26. Cloudy. High 78°26°, low 51°11°. Typical 63°17° / 44°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 58°14°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 76°25°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 65°18°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 56°13°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Partly sunny, with a high near 78.
Night: Mostly cloudy, with a low around 51.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
74°23°–78°26°
Low, likely
51°11°–60°16°
Typical high / low
63°17° / 44°7°
Wind
5 mph9 km/h
UV peak
4
Tuesday, Oct 27. Cloudy. High 76°24°, low 52°11°. Typical 63°17° / 44°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 56°14°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 73°23°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 65°18°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 56°14°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly cloudy, with a high near 76.
Night: Mostly cloudy, with a low around 52.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
71°22°–76°24°
Low, likely
49°9°–60°16°
Typical high / low
63°17° / 44°7°
Wind
9 mph15 km/h, gusts 21 mph34 km/h
UV peak
3
Wednesday, Oct 28. Cloudy. High 80°27°, low 53°12°. Typical 62°17° / 43°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Partly sunny, 58°14°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 77°25°
  Dry
3. Evening
  6 PM–midnight
  Mostly clear, 67°19°
  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 80.
Night: Mostly clear, with a low around 53.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
75°24°–80°27°
Low, likely
53°12°–58°14°
Typical high / low
62°17° / 43°6°
Wind
10 mph15 km/h, gusts 19 mph30 km/h
UV peak
4
Thursday, Oct 29. Partly sunny. High 79°26°, low 51°11°. Typical 62°17° / 43°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 59°15°
  Dry
2. Afternoon
  noon–6 PM
  Partly sunny, 79°26°
  Dry
3. Evening
  6 PM–midnight
  Clear, 68°20°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 58°14°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 79.
Night: Partly cloudy, with a low around 51.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
77°25°–81°27°
Low, likely
51°11°–61°16°
Typical high / low
62°17° / 43°6°
Wind
10 mph15 km/h, gusts 25 mph40 km/h
UV peak
4
Friday, Oct 30. Partly sunny. High 78°26°, low 57°14°. Typical 62°17° / 43°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 59°15°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 78°26°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 69°20°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 61°16°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 78.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
75°24°–81°27°
Low, likely
53°12°–62°17°
Typical high / low
62°17° / 43°6°
Wind
10 mph16 km/h, gusts 18 mph29 km/h
UV peak
4
Saturday, Oct 31. Rain. High 75°24°, low 59°15°. Typical 61°16° / 42°6°. Rain 0.16 in4.1 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 63°17°
  20% chance
2. Afternoon
  noon–6 PM
  Drizzle, 76°24°
  30% chance
3. Evening
  6 PM–midnight
  Rain, 68°20°
  30% chance · 0.09 in2.4 mm
4. Overnight
  midnight–6 AM
  Drizzle, 65°18°
  40% chance · 0.09 in2.3 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
70°21°–82°28°
Low, likely
57°14°–62°17°
Typical high / low
61°16° / 42°6°
Wind
12 mph19 km/h, gusts 35 mph56 km/h
Sunday, Nov 1. Drizzle. High 71°22°, low 63°17°. Typical 61°16° / 42°6°. Rain 0.39 in9.9 mm, 40% chance. Mostly agree.
1. Morning
  6 AM–noon
  Drizzle, 65°18°
  40% chance · 0.09 in2.3 mm
2. Afternoon
  noon–6 PM
  Drizzle, 71°22°
  40% chance · 0.08 in2 mm
3. Evening
  6 PM–midnight
  Cloudy, 68°20°
  40% chance · 0.02 in0.4 mm
4. Overnight
  midnight–6 AM
  Cloudy, 63°17°
  40% chance · 0.14 in3.5 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
70°21°–73°23°
Low, likely
60°16°–65°18°
Typical high / low
61°16° / 42°6°
Wind
22 mph36 km/h, gusts 38 mph62 km/h
UV peak
3
Monday, Nov 2. Drizzle. High 71°22°, low 62°17°. Typical 60°16° / 42°6°. Rain 0.32 in8.1 mm, 40% chance. Mostly agree.
1. Morning
  6 AM–noon
  Drizzle, 64°18°
  30% chance · 0.11 in2.7 mm
2. Afternoon
  noon–6 PM
  Drizzle, 67°20°
  30% chance · 0.17 in4.3 mm
3. Evening
  6 PM–midnight
  Cloudy, 69°20°
  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
69°21°–73°23°
Low, likely
60°16°–67°19°
Typical high / low
60°16° / 42°6°
Wind
12 mph19 km/h, gusts 26 mph42 km/h
UV peak
3

10 days15 days30 days

The outlook

Today
Dry, high 77°, low 47°.
Tomorrow
Dry, high 79°, low 52°.
Monday
Dry, high 78°, low 51°.
Rest of week
Highs 71–80°; chance of precipitation on Sunday, Monday.

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

Mississippi River at St. Louis

9.0 mi

Below flood stage

Level: 8.2 ft
Flow: 173,000 cfs

Forecast peak 8.0 ft Sat 7 AM

Reading from Sat 4 AM · NWS gauge page

Mississippi River at Mel Price (Alton) Lock and Dam

11 mi

Below flood stage

Level: 7.7 ft
Flow: 124,000 cfs

Forecast peak 7.6 ft Sat 7 AM

Reading from Sat 4 AM · NWS gauge page

Missouri River at St. Charles

22 mi

Below flood stage

Level: 12.4 ft
Flow: 65,000 cfs

Forecast peak 12.4 ft Sat 7 AM

Reading from Sat 4 AM · NWS gauge page

Mississippi River at Alton

13 mi

Below flood stage

Level: 18.4 ft

Reading from Sat 4 AM · NWS gauge page

For your home

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

Heating this week

About 84% less heating than a typical week.

This week 13Typical 82

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 1
h below 17°F: 0
h below 5°F: 0

47, 17 and 5°F are the test points heat pumps are rated at.

Comfort

Dry air outside (dew point 45°F).

Open the windows?

Today, 10:00 AM–8:00 PM

Good stretch to open the windows.

Is this typical?

ALTON - MELVIN PRICE L&D · official normals 1991–2020 · records 1943–2026

Oct 24, today vs a typical year

Today’s expected high is 13°7° warmer than typical.

Last 7 days vs normal

On average 3°1° warmer than normal (daily mean temperature).

—SunOct 18
−4°−2°MonOct 19
+2°+1°TueOct 20
+6°+3°WedOct 21
—ThuOct 22
+7°+4°FriOct 23
—SatOct 24

Pontoon Beach weather by month: normals, records, snow and freeze dates

Sun & moon

Sun

Daylight: 10 h 51 min; Losing 2 min 21 s a day; shortest Dec 21, 1 h 23 min less
Golden hour: 5:32–6:26 PM; Morning 7:02–7:55 AM
Blue hour: 6:26–6:36 PM; Morning 6:51–7:02 AM; first light 6:51 AM

Stars tonight? Fair

Mostly clear 4:57–6 AM, but the moon is 96% lit and up.

Moon

Waxing gibbous

96% lit · growing

Today: sets 5:33 AM · rises 5:06 PM
Full moon: Oct 25
New moon: Nov 9

Looking northwest from Pontoon Beach.Skyline from USGS elevation data, heights drawn up to 6× taller. Sky, sun and moon as they are now.

Pontoon Beach, IL weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Monday

Rest of week

What changed since yesterday

Radar

Rivers

Mississippi River at St. Louis

Mississippi River at Mel Price (Alton) Lock and Dam

Missouri River at St. Charles

Mississippi River at Alton

For your home

Heating this week

Heat-pump hours, next 7 days

Comfort

Open the windows?

Is this typical?

Oct 24, today vs a typical year

Last 7 days vs normal

Sun & moon

Sun

Stars tonight? Fair

Moon