Observed 6:35 AM CDT at KALN

St. Jacob, IL weather

Clear and 45°7°.

Mostly agree

Now 45°7°

Clear

Wind: Calm; Up to 5 mph8 km/h through 7 PM
Dew point: 43°6°; Comfortable · up to 51°11° by 10 AM
Humidity: 89%; Air 45°7°, dew point 43°6° · fog or dew likely
UV index: 0Low; Moderate 11 AM–4 PM · peak 4
Air quality: 67Moderate; Main pollutant: PM2.5 (fine particles)

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

3°2° cooler than this time yesterday (48°9° then, 45°7° now)

Good hours for

Above 60°16° today by 10 AM
High 76°24° today at 4 PM
Drops 12°7° tonight 6–9 PM (71°22° → 59°15°)
Below 60°16° tonight after 8 PM
Drops 12°7° tomorrow night 6–9 PM (74°23° → 62°17°)

This morningUp to 65°18° by 11 AM · Partly cloudy
This afternoonUp to 76°24° by 4 PM · Mostly cloudy
TonightDown to 49°9° by 4 AM · Partly cloudy
Tomorrow morningUp to 68°20° by 11 AM · Mostly cloudy
Tomorrow afternoonUp to 79°26° by 4 PM · Mostly cloudy
Tomorrow nightDown to 51°11° 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
Sat 7a	Mostly sunny	46°8° (likely 46°8° to 50°10°)	46°8°	0%	1 mph2 km/h from E, gusts 6 mph9 km/h	89%	32%	0
Sat 8a	Mostly sunny	50°10° (likely 47°8° to 51°11°)	50°10°	0%	2 mph3 km/h from E, gusts 6 mph10 km/h	89%	27%	0
Sat 9a	Mostly sunny	53°12° (likely 53°12° to 56°13°)	53°12°	0%	3 mph5 km/h from SE, gusts 7 mph11 km/h	89%	63%	1
Sat 10a	Mostly sunny	60°16° (likely 59°15° to 61°16°)	60°16°	0%	3 mph5 km/h from SE, gusts 9 mph14 km/h	72%	67%	2
Sat 11a	Mostly sunny	65°18° (likely 64°18° to 66°19°)	65°18°	0%	3 mph5 km/h from SE, gusts 9 mph15 km/h	58%	64%	3
Sat 12p	Cloudy	70°21° (likely 67°19° to 70°21°)	70°21°	0%	3 mph5 km/h from SE, gusts 8 mph13 km/h	46%	68%	4
Sat 1p	Partly sunny	72°22° (likely 70°21° to 72°22°)	72°22°	0%	3 mph5 km/h from SE, gusts 7 mph11 km/h	43%	61%	4
Sat 2p	Partly sunny	74°23° (likely 71°22° to 74°23°)	74°23°	0%	3 mph5 km/h from SE, gusts 7 mph11 km/h	38%	53%	4
Sat 3p	Cloudy	75°24° (likely 72°22° to 75°24°)	75°24°	0%	3 mph5 km/h from SE, gusts 8 mph12 km/h	36%	78%	3
Sat 4p	Partly sunny	76°24° (likely 71°22° to 76°24°)	76°24°	0%	3 mph5 km/h from SE, gusts 8 mph13 km/h	34%	70%	1
Sat 5p	Sunny	74°23° (likely 69°21° to 74°23°)	74°23°	0%	5 mph8 km/h from SE, gusts 8 mph13 km/h	38%	43%	1
Sat 6p	Mostly clear	71°22° (likely 65°18° to 71°22°)	71°22°	0%	3 mph5 km/h from E, gusts 7 mph11 km/h	44%	49%	0
Sat 7p	Partly cloudy	66°19° (likely 62°17° to 66°19°)	66°19°	0%	3 mph5 km/h from E, gusts 7 mph11 km/h	52%	44%	0
Sat 8p	Clear	59°15° (likely 59°15° to 62°17°)	59°15°	0%	3 mph5 km/h from E, gusts 8 mph14 km/h	67%	41%	0
Sat 9p	Clear	57°14° (likely 57°14° to 60°16°)	57°14°	0%	2 mph3 km/h from SE, gusts 9 mph14 km/h	72%	40%	0
Sat 10p	Clear	56°13° (likely 55°13° to 59°15°)	56°13°	0%	2 mph3 km/h from SE, gusts 9 mph15 km/h	72%	40%	0
Sat 11p	Mostly clear	55°13° (likely 54°12° to 58°14°)	55°13°	0%	2 mph3 km/h from SE, gusts 10 mph16 km/h	72%	26%	0
Sun 12a	Mostly clear	54°12° (likely 53°12° to 57°14°)	54°12°	0%	1 mph2 km/h from SE, gusts 10 mph16 km/h	74%	45%	0
Sun 1a	Mostly clear	52°11° (likely 52°11° to 55°13°)	52°11°	0%	1 mph2 km/h from SE, gusts 10 mph16 km/h	80%	42%	0
Sun 2a	Mostly clear	51°11° (likely 51°11° to 54°12°)	51°11°	0%	1 mph2 km/h from SE, gusts 9 mph14 km/h	83%	58%	0
Sun 3a	Mostly clear	50°10° (likely 50°10° to 53°12°)	50°10°	0%	1 mph2 km/h from SE, gusts 8 mph12 km/h	86%	45%	0
Sun 4a	Mostly clear	49°9° (likely 49°9° to 52°11°)	49°9°	0%	1 mph2 km/h from SE, gusts 7 mph12 km/h	89%	54%	0
Sun 5a	Mostly clear	49°9° (likely 49°9° to 51°11°)	49°9°	0%	1 mph2 km/h from SE, gusts 6 mph10 km/h	86%	75%	0
Sun 6a	Mostly clear	48°9° (likely 48°9° to 50°10°)	48°9°	0%	1 mph2 km/h from SE, gusts 5 mph9 km/h	93%	45%	0
Sun 7a	Mostly sunny	48°9° (likely 48°9° to 50°10°)	48°9°	0%	1 mph2 km/h from SE, gusts 5 mph8 km/h	89%	59%	0
Sun 8a	Mostly sunny	50°10° (likely 48°9° to 52°11°)	50°10°	0%	1 mph2 km/h from SE, gusts 5 mph8 km/h	89%	53%	0
Sun 9a	Cloudy	55°13° (likely 54°12° to 57°14°)	55°13°	0%	1 mph2 km/h from SE, gusts 5 mph9 km/h	86%	68%	1
Sun 10a	Mostly sunny	63°17° (likely 60°16° to 63°17°)	63°17°	0%	1 mph2 km/h from SE, gusts 7 mph11 km/h	67%	84%	2
Sun 11a	Cloudy	68°20° (likely 65°18° to 69°21°)	68°20°	0%	2 mph3 km/h from S, gusts 6 mph10 km/h	57%	79%	3
Sun 12p	Partly sunny	72°22° (likely 69°21° to 73°23°)	72°22°	0%	2 mph3 km/h from S, gusts 5 mph9 km/h	48%	71%	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	40%	76%	4
Sun 2p	Cloudy	77°25° (likely 73°23° to 77°25°)	77°25°	0%	2 mph3 km/h from S, gusts 4 mph6 km/h	39%	78%	4
Sun 3p	Cloudy	78°26° (likely 74°23° to 78°26°)	78°26°	0%	2 mph3 km/h from S, gusts 4 mph6 km/h	36%	80%	3
Sun 4p	Cloudy	79°26° (likely 73°23° to 79°26°)	79°26°	0%	2 mph3 km/h from S, gusts 4 mph6 km/h	35%	79%	3
Sun 5p	Partly sunny	77°25° (likely 71°22° to 77°25°)	77°25°	0%	1 mph2 km/h from SE, gusts 4 mph7 km/h	40%	74%	1
Sun 6p	Cloudy	74°23° (likely 68°20° to 74°23°)	74°23°	0%	1 mph2 km/h from SE, gusts 6 mph10 km/h	44%	64%	0
Sun 7p	Cloudy	68°20° (likely 64°18° to 68°20°)	68°20°	0%	1 mph2 km/h from SE, gusts 6 mph9 km/h	55%	80%	0
Sun 8p	Cloudy	62°17° (likely 62°17° to 64°18°)	62°17°	0%	1 mph2 km/h from SE, gusts 6 mph10 km/h	67%	81%	0
Sun 9p	Cloudy	60°16° (likely 60°16° to 62°17°)	60°16°	0%	1 mph2 km/h from SE, gusts 7 mph11 km/h	72%	79%	0
Sun 10p	Cloudy	59°15° (likely 59°15° to 61°16°)	59°15°	0%	1 mph2 km/h from SE, gusts 7 mph11 km/h	72%	78%	0
Sun 11p	Cloudy	58°14° (likely 57°14° to 60°16°)	58°14°	0%	1 mph2 km/h from SE, gusts 7 mph12 km/h	75%	84%	0
Mon 12a	Cloudy	56°13° (likely 56°13° to 60°16°)	56°13°	0%	0 mph0 km/h, gusts 6 mph10 km/h	80%	87%	0
Mon 1a	Cloudy	55°13° (likely 55°13° to 59°15°)	55°13°	0%	0 mph0 km/h, gusts 5 mph9 km/h	83%	88%	0
Mon 2a	Cloudy	54°12° (likely 54°12° to 59°15°)	54°12°	0%	0 mph0 km/h, gusts 5 mph7 km/h	83%	91%	0
Mon 3a	Cloudy	53°12° (likely 53°12° to 59°15°)	53°12°	0%	0 mph0 km/h, gusts 4 mph6 km/h	86%	93%	0
Mon 4a	Cloudy	52°11° (likely 52°11° to 59°15°)	52°11°	0%	0 mph0 km/h, gusts 4 mph7 km/h	86%	91%	0
Mon 5a	Cloudy	51°11° (likely 51°11° to 59°15°)	51°11°	0%	0 mph0 km/h, gusts 4 mph6 km/h	89%	86%	0
Mon 6a	Cloudy	50°10° (likely 50°10° to 58°14°)	50°10°	0%	0 mph0 km/h, gusts 3 mph5 km/h	89%	93%	0

Days ahead

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

Today, Oct 24. Cloudy. High 76°24°, low 48°9°. Typical 69°21° / 44°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Mostly sunny, 50°10°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 76°24°
  Dry
3. Evening
  6 PM–midnight
  Clear, 59°15°
  Dry
4. Overnight
  midnight–6 AM
  Mostly clear, 49°9°
  Dry
Official NWS forecast
Today: Mostly sunny, with a high near 76. Southeast wind 1 to 5 mph.
Tonight: Mostly clear, with a low around 48. Southeast wind around 3 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
72°22°–76°24°
Low, likely
46°8°–49°9°
Typical high / low
69°21° / 44°7°
Wind
8 mph12 km/h, gusts 15 mph24 km/h
UV peak
4
Tomorrow, Oct 25. Cloudy. High 79°26°, low 50°10°. Typical 69°21° / 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, 51°11°
  Dry
Official NWS forecast
Day: Mostly sunny, with a high near 79. Southeast wind around 2 mph.
Night: Mostly cloudy, with a low around 50. Southeast wind around 1 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
74°23°–79°26°
Low, likely
48°9°–50°10°
Typical high / low
69°21° / 44°7°
Wind
7 mph11 km/h, gusts 15 mph24 km/h
UV peak
4
Monday, Oct 26. Cloudy. High 78°26°, low 50°10°. Typical 68°20° / 44°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 55°13°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 76°24°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 63°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. High near 78, with temperatures falling to around 74 in the afternoon. Southwest wind around 2 mph.
Night: Mostly cloudy, with a low around 50.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
74°23°–78°26°
Low, likely
50°10°–56°13°
Typical high / low
68°20° / 44°7°
Wind
7 mph12 km/h
UV peak
4
Tuesday, Oct 27. Cloudy. High 75°24°, low 51°11°. Typical 68°20° / 43°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 53°12°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 73°23°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 62°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 75.
Night: Mostly cloudy, with a low around 51.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
71°22°–75°24°
Low, likely
48°9°–55°13°
Typical high / low
68°20° / 43°6°
Wind
10 mph16 km/h, gusts 20 mph33 km/h
UV peak
3
Wednesday, Oct 28. Partly sunny. High 80°27°, low 52°11°. Typical 67°19° / 43°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 55°13°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 77°25°
  Dry
3. Evening
  6 PM–midnight
  Clear, 64°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 80.
Night: Mostly clear, with a low around 52.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
75°24°–80°27°
Low, likely
51°11°–54°12°
Typical high / low
67°19° / 43°6°
Wind
11 mph18 km/h, gusts 20 mph32 km/h
UV peak
4
Thursday, Oct 29. Mostly sunny. High 79°26°, low 50°10°. Typical 67°19° / 43°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 57°14°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 78°26°
  Dry
3. Evening
  6 PM–midnight
  Clear, 66°19°
  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 79.
Night: Partly cloudy, with a low around 50.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
76°24°–80°27°
Low, likely
50°10°–58°14°
Typical high / low
67°19° / 43°6°
Wind
12 mph19 km/h, gusts 25 mph40 km/h
UV peak
4
Friday, Oct 30. Partly sunny. High 77°25°, low 52°11°. Typical 66°19° / 42°6°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 58°14°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 78°26°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 66°19°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 59°15°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 77.
Night: A slight chance of rain showers after 1am. Mostly cloudy, with a low around 52. Chance of precipitation is 20%.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
75°24°–81°27°
Low, likely
52°11°–58°14°
Typical high / low
66°19° / 42°6°
Wind
11 mph18 km/h, gusts 18 mph29 km/h
UV peak
4
Saturday, Oct 31. Cloudy. High 74°23°, low 60°16°. Typical 66°19° / 42°6°. Rain 0.09 in2.3 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 62°17°
  20% chance
2. Afternoon
  noon–6 PM
  Cloudy, 75°24°
  30% chance
3. Evening
  6 PM–midnight
  Cloudy, 69°20°
  30% chance · 0.03 in0.7 mm
4. Overnight
  midnight–6 AM
  Cloudy, 66°19°
  40% chance · 0.07 in1.8 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°–81°27°
Low, likely
56°13°–64°18°
Typical high / low
66°19° / 42°6°
Wind
14 mph22 km/h, gusts 19 mph31 km/h
UV peak
1
Sunday, Nov 1. Showers. High 70°21°, low 63°17°. Typical 65°18° / 42°6°. Rain 0.62 in16 mm, 50% chance. Mostly agree.
1. Morning
  6 AM–noon
  Drizzle, 66°19°
  40% chance · 0.13 in3.4 mm
2. Afternoon
  noon–6 PM
  Showers, 67°19°
  40% chance · 0.27 in6.9 mm
3. Evening
  6 PM–midnight
  Drizzle, 66°19°
  40% chance · 0.1 in2.6 mm
4. Overnight
  midnight–6 AM
  Drizzle, 59°15°
  40% chance · 0.22 in5.7 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
67°19°–73°23°
Low, likely
59°15°–65°18°
Typical high / low
65°18° / 42°6°
Wind
25 mph41 km/h, gusts 40 mph64 km/h
Monday, Nov 2. Rain. High 67°19°, low 58°14°. Typical 65°18° / 41°5°. Rain 0.42 in11 mm, 40% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Drizzle, 60°15°
  40% chance · 0.15 in3.9 mm
2. Afternoon
  noon–6 PM
  Drizzle, 63°17°
  30% chance · 0.19 in4.8 mm
3. Evening
  6 PM–midnight
  Rain, 64°18°
  20% chance · 0.14 in3.4 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
60°16°–73°23°
Low, likely
49°9°–66°19°
Typical high / low
65°18° / 41°5°
Wind
23 mph37 km/h, gusts 40 mph64 km/h
UV peak
2

10 days15 days30 days

The outlook

Today
Dry, high 76°, low 48°.
Tomorrow
Dry, high 79°, low 50°, warming up.
Monday
Dry, high 78°, low 50°.
Rest of week
Highs 67–80°; 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 Mel Price (Alton) Lock and Dam

23 mi

Below flood stage

Level: 7.7 ft
Flow: 124,000 cfs

Forecast peak 7.6 ft Sat 7 AM

Reading from Sat 5:30 AM · NWS gauge page

Mississippi River at St. Louis

23 mi

Below flood stage

Level: 8.1 ft
Flow: 172,000 cfs

Forecast peak 8.0 ft Sat 7 AM

Reading from Sat 5:30 AM · NWS gauge page

Silver Creek near Mascoutah

14 mi

Level: 7.9 ft
Flow: 1,440 cfs

Reading from Sat 4:45 AM · NWS gauge page

Kaskaskia River at Carlyle

23 mi

Below flood stage

Level: 5.7 ft
Flow: 74 cfs

Reading from Sat 5 AM · NWS gauge page

For your home

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

Heating this week

About 80% less heating than a typical week.

This week 13Typical 67

Heating degree days, base 65°F

Comfort

Dry air outside (dew point 47°F).

Open the windows?

Today, 10:00 AM–7:00 PM

Good stretch to open the windows.

Is this typical?

BELLEVILLE SIU RESEARCH · official normals 1991–2020 · records 1948–2026

Oct 24, today vs a typical year

Today’s expected high is 7°4° warmer than typical.

Last 7 days vs normal

—SunOct 18
—MonOct 19
—TueOct 20
—WedOct 21
—ThuOct 22
—FriOct 23
—SatOct 24

St. Jacob weather by month: normals, records, snow and freeze dates

Sun & moon

Sun

Daylight: 10 h 51 min; Losing 2 min 25 s a day; shortest Dec 21, 1 h 23 min less
Golden hour: 5:31–6:25 PM; Morning 7:00–7:54 AM
Blue hour: 6:25–6:35 PM; Morning 6:50–7:00 AM; first light 6:50 AM

Stars tonight? Poor

Clouds most of the night (about 47% cover).

Moon

Waxing gibbous

96% lit · growing

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

Looking west from St. Jacob. The highest point on the skyline is about 2,900 ft, 27 mi away.Skyline from USGS elevation data, heights drawn up to 6× taller. Sky, sun and moon as they are now.

St. Jacob, 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 Mel Price (Alton) Lock and Dam

Mississippi River at St. Louis

Silver Creek near Mascoutah

Kaskaskia River at Carlyle

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