Observed 12:20 AM CDT at KCPS

Williamson, IL weather

Clear and 52°11°.

Forecasts agree

Now 52°11°

Clear

Wind: Calm; Up to 5 mph8 km/h through 1 PM
Dew point: 46°8°; Comfortable
UV index: 0Low; Moderate 11 AM–4 PM · peak 4
Pressure: 30.29 inHg1026 hPa; Rising slowly · +0.03 inHg+1.0 hPa next 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

4°2° warmer than this time yesterday (49°9° then, 53°11° now)

Good hours for

Low 46°8° today at 6 AM
Above 60°16° today by 10 AM
High 75°24° today at 4 PM
Below 60°16° tonight after 8 PM
Drops 12°7° tomorrow night 6–9 PM (73°23° → 61°16°)

TonightDown to 47°8° by 5 AM · Partly cloudy
This morningUp to 65°18° by 11 AM · Partly cloudy
This afternoonUp to 75°24° by 4 PM · Mostly cloudy
TonightDown to 48°9° by 4 AM · Partly cloudy
Tomorrow morningUp to 68°20° by 11 AM · Mostly cloudy
Tomorrow afternoonUp to 78°26° by 4 PM · Mostly cloudy
Tomorrow nightDown to 56°13° by midnight · 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 1a	Mostly clear	51°11° (likely 51°11° to 56°13°)	51°11°	0%	2 mph3 km/h from SE, gusts 9 mph15 km/h	83%	35%	0
Sat 2a	Clear	50°10° (likely 50°10° to 55°13°)	50°10°	0%	2 mph3 km/h from SE, gusts 9 mph15 km/h	86%	31%	0
Sat 3a	Mostly clear	49°9° (likely 49°9° to 54°12°)	49°9°	0%	2 mph3 km/h from SE, gusts 9 mph15 km/h	86%	29%	0
Sat 4a	Clear	48°9° (likely 48°9° to 53°12°)	48°9°	0%	2 mph3 km/h from SE, gusts 8 mph14 km/h	89%	31%	0
Sat 5a	Mostly clear	47°8° (likely 47°8° to 51°11°)	47°8°	0%	1 mph2 km/h from E, gusts 7 mph12 km/h	93%	24%	0
Sat 6a	Mostly clear	46°8° (likely 46°8° to 50°10°)	46°8°	0%	1 mph2 km/h from E, gusts 7 mph11 km/h	93%	51%	0
Sat 7a	Partly sunny	46°8° (likely 46°8° to 50°10°)	46°8°	0%	2 mph3 km/h from E, gusts 7 mph11 km/h	93%	52%	0
Sat 8a	Mostly sunny	47°8° (likely 46°8° to 52°11°)	46°8°	0%	3 mph5 km/h from E, gusts 6 mph10 km/h	96%	29%	0
Sat 9a	Partly sunny	53°12° (likely 53°12° to 57°14°)	53°12°	0%	3 mph5 km/h from SE, gusts 8 mph13 km/h	86%	26%	1
Sat 10a	Partly sunny	60°16° (likely 59°15° to 62°17°)	60°16°	0%	5 mph8 km/h from SE, gusts 11 mph17 km/h	69%	24%	2
Sat 11a	Partly sunny	65°18° (likely 64°18° to 67°19°)	65°18°	0%	5 mph8 km/h from SE, gusts 10 mph16 km/h	58%	60%	3
Sat 12p	Cloudy	69°21° (likely 68°20° to 71°22°)	69°21°	0%	5 mph8 km/h from SE, gusts 9 mph14 km/h	47%	76%	4
Sat 1p	Cloudy	72°22° (likely 70°21° to 74°23°)	72°22°	0%	5 mph8 km/h from SE, gusts 8 mph12 km/h	39%	70%	4
Sat 2p	Partly sunny	73°23° (likely 72°22° to 75°24°)	73°23°	0%	5 mph8 km/h from SE, gusts 7 mph11 km/h	38%	74%	4
Sat 3p	Cloudy	74°23° (likely 73°23° to 75°24°)	74°23°	0%	5 mph8 km/h from SE, gusts 7 mph11 km/h	35%	64%	3
Sat 4p	Partly sunny	75°24° (likely 73°23° to 75°24°)	75°24°	0%	3 mph5 km/h from SE, gusts 7 mph12 km/h	33%	72%	2
Sat 5p	Cloudy	73°23° (likely 71°22° to 73°23°)	73°23°	0%	5 mph8 km/h from SE, gusts 8 mph12 km/h	37%	74%	1
Sat 6p	Partly cloudy	70°21° (likely 66°19° to 70°21°)	70°21°	0%	3 mph5 km/h from SE, gusts 7 mph11 km/h	42%	47%	0
Sat 7p	Mostly clear	65°18° (likely 62°17° to 65°18°)	65°18°	0%	3 mph5 km/h from SE, gusts 8 mph12 km/h	52%	41%	0
Sat 8p	Clear	59°15° (likely 59°15° to 63°17°)	59°15°	0%	2 mph3 km/h from E, gusts 9 mph15 km/h	64%	40%	0
Sat 9p	Clear	57°14° (likely 57°14° to 61°16°)	57°14°	0%	2 mph3 km/h from SE, gusts 10 mph16 km/h	67%	40%	0
Sat 10p	Clear	55°13° (likely 55°13° to 59°15°)	55°13°	0%	2 mph3 km/h from SE, gusts 9 mph14 km/h	69%	40%	0
Sat 11p	Clear	54°12° (likely 54°12° to 58°14°)	54°12°	0%	1 mph2 km/h from SE, gusts 9 mph15 km/h	71%	32%	0
Sun 12a	Clear	53°12° (likely 53°12° to 57°14°)	53°12°	0%	1 mph2 km/h from SE, gusts 9 mph15 km/h	74%	37%	0
Sun 1a	Clear	52°11° (likely 52°11° to 55°13°)	52°11°	0%	1 mph2 km/h from SE, gusts 8 mph14 km/h	77%	40%	0
Sun 2a	Partly cloudy	51°11° (likely 51°11° to 54°12°)	51°11°	0%	1 mph2 km/h from SE, gusts 7 mph11 km/h	80%	50%	0
Sun 3a	Partly cloudy	50°10° (likely 50°10° to 53°12°)	50°10°	0%	1 mph2 km/h from SE, gusts 7 mph11 km/h	83%	51%	0
Sun 4a	Mostly clear	48°9° (likely 48°9° to 52°11°)	48°9°	0%	1 mph2 km/h from SE, gusts 6 mph10 km/h	86%	20%	0
Sun 5a	Clear	48°9° (likely 48°9° to 51°11°)	48°9°	0%	1 mph2 km/h from SE, gusts 6 mph9 km/h	86%	11%	0
Sun 6a	Partly cloudy	48°9° (likely 48°9° to 51°11°)	48°9°	0%	1 mph2 km/h from SE, gusts 6 mph9 km/h	86%	49%	0
Sun 7a	Mostly sunny	47°8° (likely 47°8° to 51°11°)	47°8°	0%	1 mph2 km/h from SE, gusts 5 mph9 km/h	89%	56%	0
Sun 8a	Partly sunny	48°9° (likely 48°9° to 53°12°)	48°9°	0%	1 mph2 km/h from SE, gusts 6 mph9 km/h	93%	53%	0
Sun 9a	Partly sunny	55°13° (likely 55°13° to 58°14°)	55°13°	0%	2 mph3 km/h from SE, gusts 6 mph10 km/h	80%	65%	1
Sun 10a	Partly sunny	63°17° (likely 63°17° to 64°18°)	63°17°	0%	2 mph3 km/h from SE, gusts 8 mph13 km/h	65%	70%	2
Sun 11a	Cloudy	68°20° (likely 68°20° to 70°21°)	68°20°	0%	2 mph3 km/h from S, gusts 8 mph12 km/h	55%	80%	3
Sun 12p	Cloudy	72°22° (likely 72°22° to 74°23°)	72°22°	0%	3 mph5 km/h from S, gusts 7 mph11 km/h	46%	78%	4
Sun 1p	Partly sunny	75°24° (likely 74°23° to 77°25°)	75°24°	0%	3 mph5 km/h from S, gusts 6 mph9 km/h	38%	76%	4
Sun 2p	Partly sunny	76°24° (likely 76°24° to 78°26°)	76°24°	0%	2 mph3 km/h from S, gusts 5 mph8 km/h	39%	70%	4
Sun 3p	Partly sunny	77°25° (likely 76°24° to 79°26°)	77°25°	0%	2 mph3 km/h from S, gusts 5 mph8 km/h	36%	77%	4
Sun 4p	Cloudy	78°26° (likely 76°24° to 79°26°)	78°26°	0%	2 mph3 km/h from S, gusts 5 mph8 km/h	34%	75%	2
Sun 5p	Cloudy	76°24° (likely 73°23° to 77°25°)	76°24°	0%	2 mph3 km/h from S, gusts 5 mph8 km/h	37%	75%	1
Sun 6p	Cloudy	73°23° (likely 68°20° to 73°23°)	73°23°	0%	1 mph2 km/h from SE, gusts 4 mph6 km/h	43%	72%	0
Sun 7p	Cloudy	68°20° (likely 64°18° to 68°20°)	68°20°	0%	1 mph2 km/h from SE, gusts 4 mph7 km/h	51%	86%	0
Sun 8p	Cloudy	61°16° (likely 61°16° to 65°18°)	61°16°	0%	0 mph0 km/h, gusts 3 mph5 km/h	67%	88%	0
Sun 9p	Cloudy	58°14° (likely 58°14° to 64°18°)	58°14°	0%	0 mph0 km/h, gusts 4 mph6 km/h	72%	92%	0
Sun 10p	Cloudy	58°14° (likely 58°14° to 63°17°)	58°14°	0%	0 mph0 km/h, gusts 4 mph6 km/h	69%	93%	0
Sun 11p	Cloudy	57°14° (likely 57°14° to 62°17°)	57°14°	0%	0 mph0 km/h, gusts 4 mph6 km/h	72%	90%	0
Mon 12a	Cloudy	56°13° (likely 56°13° to 61°16°)	56°13°	0%	0 mph0 km/h, gusts 5 mph8 km/h	74%	90%	0

Days ahead

Tap a day for its hours and the official wording.

Today, Oct 24. Cloudy. High 75°24°, low 46°8°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Partly sunny, 47°8°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 75°24°
  Dry
3. Evening
  6 PM–midnight
  Clear, 59°15°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 48°9°
  Dry
Official NWS forecast
Today: Mostly sunny, with a high near 75. Southeast wind 1 to 5 mph.
Tonight: Mostly clear, with a low around 46. Southeast wind around 2 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
73°23°–75°24°
Low, likely
46°8°–50°10°
Wind
7 mph11 km/h, gusts 15 mph25 km/h
UV peak
4
Tomorrow, Oct 25. Partly sunny. High 78°26°, low 49°9°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Partly sunny, 48°9°
  Dry
2. Afternoon
  noon–6 PM
  Partly sunny, 78°26°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 61°16°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 55°13°
  Dry
Official NWS forecast
Day: Mostly sunny, with a high near 78. Southeast wind around 3 mph.
Night: Mostly cloudy, with a low around 49. Southeast wind around 1 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
76°24°–79°26°
Low, likely
48°9°–50°10°
Wind
6 mph10 km/h, gusts 13 mph21 km/h
UV peak
4
Monday, Oct 26. Cloudy. High 77°25°, low 49°9°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Partly sunny, 55°13°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 76°25°
  Dry
3. Evening
  6 PM–midnight
  Clear, 62°17°
  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 77.
Night: Mostly cloudy, with a low around 49.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
76°24°–77°25°
Low, likely
49°9°–56°13°
Wind
7 mph10 km/h, gusts 14 mph22 km/h
UV peak
4
Tuesday, Oct 27. Cloudy. High 74°23°, low 50°10°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Cloudy, 55°13°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 73°23°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 63°17°
  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 74.
Night: Mostly cloudy, with a low around 50.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
72°22°–74°23°
Low, likely
49°9°–56°13°
Wind
10 mph15 km/h, gusts 23 mph36 km/h
UV peak
3
Wednesday, Oct 28. Cloudy. High 78°26°, low 52°11°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 56°13°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 77°25°
  Dry
3. Evening
  6 PM–midnight
  Partly cloudy, 65°18°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 55°13°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 78.
Night: Mostly clear, with a low around 52.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
74°23°–78°26°
Low, likely
52°11°–55°13°
Wind
10 mph17 km/h, gusts 22 mph35 km/h
UV peak
4
Thursday, Oct 29. Mostly sunny. High 77°25°, low 49°9°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 57°14°
  Dry
2. Afternoon
  noon–6 PM
  Partly sunny, 77°25°
  Dry
3. Evening
  6 PM–midnight
  Partly cloudy, 64°18°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 56°13°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 77.
Night: Partly cloudy, with a low around 49.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
75°24°–80°27°
Low, likely
49°9°–57°14°
Wind
13 mph20 km/h, gusts 26 mph41 km/h
UV peak
4
Friday, Oct 30. Partly sunny. High 76°24°, low 55°13°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Partly sunny, 58°15°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 78°26°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 67°19°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 60°15°
  20% chance
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 76.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
76°24°–80°27°
Low, likely
52°11°–58°14°
Wind
11 mph17 km/h, gusts 22 mph36 km/h
UV peak
4
Saturday, Oct 31. Rain. High 74°23°, low 59°15°. Rain 0.19 in4.8 mm, 40% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 63°17°
  30% chance
2. Afternoon
  noon–6 PM
  Mostly sunny, 75°24°
  30% chance
3. Evening
  6 PM–midnight
  Rain, 68°20°
  30% chance · 0.08 in2 mm
4. Overnight
  midnight–6 AM
  Drizzle, 64°18°
  30% chance · 0.04 in1 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
69°21°–81°27°
Low, likely
57°14°–62°17°
Wind
13 mph21 km/h, gusts 34 mph54 km/h
Sunday, Nov 1. Drizzle. High 71°22°, low 61°16°. Rain 0.36 in9.1 mm, 40% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Partly sunny, 64°18°
  40% chance · 0.05 in1.3 mm
2. Afternoon
  noon–6 PM
  Drizzle, 71°21°
  40% chance · 0.11 in2.7 mm
3. Evening
  6 PM–midnight
  Drizzle, 65°18°
  30% chance · 0.16 in4 mm
4. Overnight
  midnight–6 AM
  Drizzle, 58°15°
  30% 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
68°20°–76°24°
Low, likely
57°14°–64°18°
Wind
25 mph40 km/h, gusts 44 mph71 km/h
UV peak
3
Monday, Nov 2. Drizzle. High 67°19°, low 54°12°. Rain 0.3 in7.6 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 60°15°
  30% chance · 0.06 in1.4 mm
2. Afternoon
  noon–6 PM
  Cloudy, 64°18°
  20% chance · 0.08 in2.1 mm
3. Evening
  6 PM–midnight
  Cloudy, 58°14°
  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
64°18°–72°22°
Low, likely
51°11°–57°14°
Wind
15 mph24 km/h, gusts 40 mph64 km/h
UV peak
3

10 days15 days30 days

The outlook

Today
Dry, high 75°, low 46°.
Tomorrow
Dry, high 78°, low 49°, warming up.
Monday
Dry, high 77°, low 49°.
Rest of week
Mostly dry, highs 67–78°.

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 Mel Price (Alton) Lock and Dam

22 mi

Below flood stage

Level: 7.7 ft
Flow: 124,000 cfs

Forecast peak 7.6 ft Sat 7 AM

Reading from Sat 1 AM · NWS gauge page

Mississippi River at Alton

24 mi

Below flood stage

Level: 18.5 ft

Reading from Sat 1 AM · NWS gauge page

Sun & moon

Sun

Daylight: 10 h 50 min; Losing 2 min 21 s a day; shortest Dec 21, 1 h 24 min less
Golden hour: 5:31–6:24 PM; Morning 7:01–7:54 AM
Blue hour: 6:24–6:35 PM; Morning 6:50–7:01 AM; first light 6:50 AM

Stars tonight? Poor

Clouds most of the night (about 33% cover).

Moon

Waxing gibbous

95% lit · growing

Today: sets 5:32 AM · rises 5:05 PM
Full moon: Oct 25
New moon: Nov 9

Looking west from Williamson. The highest point on the skyline is about 3,000 ft, 27 mi away.Skyline from USGS elevation data, heights drawn up to 6× taller. Sky, sun and moon as they are now.