Observed 6:50 AM CDT at KALN

Troy, IL weather

Clear and 48°9°.

Forecasts agree

Now 48°9°

Clear

Wind: Calm; Up to 6 mph10 km/h through 7 PM
Dew point: 47°8°; Comfortable
Humidity: 96%; Air 48°9°, dew point 47°8° · fog or dew likely
UV index: 0Low; Moderate 11 AM–4 PM · peak 4
Air quality: 74Moderate; Main pollutant: PM2.5 (fine particles)

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

Good hours for

Above 60°16° today by 10 AM
High 76°24° today at 4 PM
Below 60°16° tonight after 9 PM

This morningUp to 67°19° by 11 AM · Clear
This afternoonUp to 76°24° by 4 PM · Clear
TonightDown to 50°10° by 4 AM · Partly cloudy
Tomorrow morningUp to 66°19° by 11 AM · Mostly cloudy
Tomorrow afternoonUp to 76°24° by 4 PM · Partly cloudy
Tomorrow nightDown to 48°9° by 5 AM · Partly 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	Sunny	48°9° (likely 46°8° to 51°11°)	48°9°	0%	2 mph3 km/h from SE, gusts 6 mph9 km/h	96%	3%	0
Fri 8a	Sunny	52°11° (likely 47°8° to 52°11°)	52°11°	0%	2 mph3 km/h from SE, gusts 6 mph10 km/h	86%	3%	0
Fri 9a	Sunny	55°13° (likely 53°12° to 57°14°)	55°13°	0%	3 mph5 km/h from SE, gusts 7 mph12 km/h	86%	0%	1
Fri 10a	Sunny	63°17° (likely 59°15° to 63°17°)	63°17°	0%	3 mph5 km/h from SE, gusts 12 mph19 km/h	67%	0%	2
Fri 11a	Sunny	67°19° (likely 64°18° to 67°19°)	67°19°	0%	5 mph8 km/h from SE, gusts 12 mph19 km/h	59%	0%	3
Fri 12p	Sunny	71°22° (likely 68°20° to 71°22°)	71°22°	0%	5 mph8 km/h from SE, gusts 11 mph17 km/h	47%	0%	4
Fri 1p	Sunny	73°23° (likely 71°22° to 73°23°)	73°23°	0%	6 mph10 km/h from SE, gusts 11 mph18 km/h	44%	0%	4
Fri 2p	Sunny	74°23° (likely 72°22° to 74°23°)	74°23°	0%	6 mph10 km/h from SE, gusts 11 mph17 km/h	43%	0%	4
Fri 3p	Sunny	75°24° (likely 73°23° to 75°24°)	75°24°	0%	6 mph10 km/h from SE, gusts 10 mph16 km/h	41%	0%	3
Fri 4p	Sunny	76°24° (likely 72°22° to 76°24°)	76°24°	0%	6 mph10 km/h from SE, gusts 9 mph14 km/h	39%	0%	2
Fri 5p	Sunny	74°23° (likely 70°21° to 74°23°)	74°23°	0%	6 mph10 km/h from SE, gusts 9 mph15 km/h	41%	0%	1
Fri 6p	Clear	71°22° (likely 66°19° to 71°22°)	71°22°	0%	5 mph8 km/h from E, gusts 8 mph12 km/h	47%	0%	0
Fri 7p	Clear	66°19° (likely 61°16° to 66°19°)	66°19°	0%	5 mph8 km/h from E, gusts 8 mph13 km/h	56%	0%	0
Fri 8p	Clear	60°16° (likely 58°14° to 62°17°)	60°16°	0%	5 mph8 km/h from E, gusts 11 mph18 km/h	67%	3%	0
Fri 9p	Clear	58°14° (likely 56°13° to 61°16°)	58°14°	0%	3 mph5 km/h from SE, gusts 11 mph18 km/h	72%	7%	0
Fri 10p	Clear	57°14° (likely 55°13° to 60°16°)	57°14°	0%	3 mph5 km/h from SE, gusts 11 mph18 km/h	72%	11%	0
Fri 11p	Clear	55°13° (likely 53°12° to 59°15°)	55°13°	0%	3 mph5 km/h from SE, gusts 11 mph18 km/h	77%	15%	0
Sat 12a	Clear	54°12° (likely 52°11° to 58°14°)	54°12°	0%	2 mph3 km/h from SE, gusts 10 mph16 km/h	77%	29%	0
Sat 1a	Cloudy	53°12° (likely 51°11° to 56°13°)	53°12°	0%	2 mph3 km/h from SE, gusts 8 mph13 km/h	80%	70%	0
Sat 2a	Cloudy	52°11° (likely 50°10° to 55°13°)	52°11°	0%	2 mph3 km/h from SE, gusts 8 mph13 km/h	83%	74%	0
Sat 3a	Mostly clear	51°11° (likely 49°9° to 54°12°)	51°11°	0%	2 mph3 km/h from SE, gusts 8 mph12 km/h	86%	79%	0
Sat 4a	Mostly clear	50°10° (likely 48°9° to 53°12°)	50°10°	0%	2 mph3 km/h from SE, gusts 7 mph11 km/h	86%	67%	0
Sat 5a	Mostly clear	50°10° (likely 47°8° to 52°11°)	50°10°	0%	2 mph3 km/h from SE, gusts 7 mph11 km/h	86%	67%	0
Sat 6a	Mostly clear	48°9° (likely 46°8° to 51°11°)	48°9°	0%	2 mph3 km/h from SE, gusts 7 mph11 km/h	93%	77%	0
Sat 7a	Cloudy	48°9° (likely 45°7° to 51°11°)	48°9°	0%	2 mph3 km/h from E, gusts 6 mph10 km/h	89%	88%	0
Sat 8a	Mostly sunny	50°10° (likely 46°8° to 52°11°)	49°9°	0%	3 mph5 km/h from E, gusts 6 mph10 km/h	89%	64%	0
Sat 9a	Partly sunny	54°12° (likely 52°11° to 57°14°)	54°12°	0%	3 mph5 km/h from SE, gusts 6 mph10 km/h	86%	79%	1
Sat 10a	Partly sunny	62°17° (likely 58°14° to 62°17°)	62°17°	0%	5 mph8 km/h from SE, gusts 10 mph16 km/h	67%	61%	2
Sat 11a	Cloudy	66°19° (likely 64°18° to 66°19°)	66°19°	0%	5 mph8 km/h from SE, gusts 10 mph15 km/h	58%	75%	3
Sat 12p	Cloudy	70°21° (likely 67°19° to 70°21°)	70°21°	0%	5 mph8 km/h from SE, gusts 9 mph14 km/h	49%	79%	4
Sat 1p	Partly sunny	73°23° (likely 70°21° to 73°23°)	73°23°	0%	5 mph8 km/h from SE, gusts 8 mph13 km/h	43%	51%	4
Sat 2p	Partly sunny	74°23° (likely 72°22° to 74°23°)	74°23°	0%	5 mph8 km/h from SE, gusts 7 mph12 km/h	40%	73%	4
Sat 3p	Partly sunny	75°24° (likely 72°22° to 75°24°)	75°24°	0%	5 mph8 km/h from SE, gusts 8 mph12 km/h	38%	58%	3
Sat 4p	Partly sunny	76°24° (likely 72°22° to 76°24°)	76°24°	0%	5 mph8 km/h from SE, gusts 8 mph13 km/h	36%	50%	2
Sat 5p	Sunny	74°23° (likely 70°21° to 74°23°)	74°23°	0%	5 mph8 km/h from SE, gusts 8 mph13 km/h	40%	40%	1
Sat 6p	Clear	71°22° (likely 66°19° to 71°22°)	71°22°	0%	3 mph5 km/h from SE, gusts 7 mph11 km/h	44%	40%	0
Sat 7p	Clear	66°19° (likely 61°16° to 66°19°)	66°19°	0%	3 mph5 km/h from SE, gusts 7 mph11 km/h	54%	35%	0
Sat 8p	Clear	60°16° (likely 58°14° to 62°17°)	60°16°	0%	3 mph5 km/h from SE, gusts 8 mph12 km/h	64%	13%	0
Sat 9p	Mostly clear	58°14° (likely 56°13° to 59°15°)	58°14°	0%	3 mph5 km/h from SE, gusts 7 mph12 km/h	69%	15%	0
Sat 10p	Mostly clear	57°14° (likely 54°12° to 58°14°)	57°14°	0%	2 mph3 km/h from SE, gusts 9 mph15 km/h	72%	31%	0
Sat 11p	Partly cloudy	56°13° (likely 53°12° to 57°14°)	56°13°	0%	2 mph3 km/h from SE, gusts 10 mph16 km/h	74%	34%	0
Sun 12a	Mostly clear	54°12° (likely 52°11° to 57°14°)	54°12°	0%	1 mph2 km/h from SE, gusts 9 mph15 km/h	77%	55%	0
Sun 1a	Mostly clear	53°12° (likely 51°11° to 57°14°)	53°12°	0%	1 mph2 km/h from SE, gusts 9 mph15 km/h	80%	57%	0
Sun 2a	Partly cloudy	52°11° (likely 49°9° to 57°14°)	52°11°	0%	1 mph2 km/h from SE, gusts 6 mph10 km/h	83%	40%	0
Sun 3a	Partly cloudy	51°11° (likely 48°9° to 57°14°)	51°11°	0%	1 mph2 km/h from SE, gusts 6 mph9 km/h	83%	36%	0
Sun 4a	Partly cloudy	50°10° (likely 47°8° to 56°13°)	50°10°	0%	1 mph2 km/h from SE, gusts 6 mph9 km/h	86%	42%	0
Sun 5a	Partly cloudy	48°9° (likely 46°8° to 56°13°)	48°9°	0%	1 mph2 km/h from SE, gusts 5 mph9 km/h	89%	47%	0
Sun 6a	Partly cloudy	47°8° (likely 46°8° to 55°13°)	47°8°	0%	1 mph2 km/h from SE, gusts 4 mph7 km/h	93%	45%	0

Days ahead

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

Today, Oct 23. Sunny. High 76°24°, low 48°9°. Typical 70°21° / 44°7°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 52°11°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 76°24°
  Dry
3. Evening
  6 PM–midnight
  Clear, 60°16°
  Dry
4. Overnight
  midnight–6 AM
  Mostly clear, 50°10°
  Dry
Official NWS forecast
Today: Sunny, with a high near 76. Southeast wind 2 to 6 mph.
Tonight: Mostly clear, with a low around 48. Southeast wind around 5 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
73°23°–76°24°
Low, likely
46°8°–50°10°
Typical high / low
70°21° / 44°7°
Wind
8 mph13 km/h, gusts 17 mph27 km/h
UV peak
5
Tomorrow, Oct 24. Mostly sunny. High 76°24°, low 47°8°. Typical 69°21° / 44°7°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Partly sunny, 50°10°
  Dry
2. Afternoon
  noon–6 PM
  Partly sunny, 76°24°
  Dry
3. Evening
  6 PM–midnight
  Mostly clear, 60°16°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 48°9°
  Dry
Official NWS forecast
Day: Sunny, with a high near 76. Southeast wind around 5 mph.
Night: Mostly clear, with a low around 47. Southeast wind around 3 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
72°22°–76°24°
Low, likely
45°7°–51°11°
Typical high / low
69°21° / 44°7°
Wind
6 mph10 km/h, gusts 15 mph24 km/h
UV peak
4
Sunday, Oct 25. Partly sunny. High 77°25°, low 50°10°. Typical 69°21° / 44°7°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Cloudy, 50°10°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 77°25°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 63°17°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 55°13°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 77. South wind around 2 mph.
Night: Mostly cloudy, with a low around 50.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
77°25°–78°26°
Low, likely
45°7°–53°12°
Typical high / low
69°21° / 44°7°
Wind
7 mph11 km/h, gusts 13 mph20 km/h
UV peak
4
Monday, Oct 26. Mostly cloudy. High 77°25°, low 51°11°. Typical 68°20° / 44°7°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Cloudy, 56°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
  Partly 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 51.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
75°24°–77°25°
Low, likely
51°11°–57°14°
Typical high / low
68°20° / 44°7°
Wind
7 mph12 km/h, gusts 16 mph25 km/h
UV peak
4
Tuesday, Oct 27. Cloudy. High 75°24°, low 50°10°. Typical 68°20° / 43°6°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Cloudy, 54°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, 55°13°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Partly sunny, with a high near 75.
Night: Mostly cloudy, with a low around 50.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
72°22°–75°24°
Low, likely
48°9°–57°14°
Typical high / low
68°20° / 43°6°
Wind
9 mph14 km/h, gusts 21 mph34 km/h
UV peak
3
Wednesday, Oct 28. Cloudy. High 76°24°, low 51°11°. Typical 67°19° / 43°6°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Mostly sunny, 56°13°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 76°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 76.
Night: Mostly clear, with a low around 51.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
75°24°–77°25°
Low, likely
49°9°–58°14°
Typical high / low
67°19° / 43°6°
Wind
11 mph17 km/h, gusts 25 mph41 km/h
UV peak
4
Thursday, Oct 29. Partly sunny. High 76°24°, low 50°10°. Typical 67°19° / 43°6°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 57°14°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 74°23°
  Dry
3. Evening
  6 PM–midnight
  Partly cloudy, 63°17°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 55°13°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 76.
Night: Partly cloudy, with a low around 50.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
69°21°–79°26°
Low, likely
50°10°–58°14°
Typical high / low
67°19° / 43°6°
Wind
13 mph21 km/h, gusts 24 mph39 km/h
UV peak
3
Friday, Oct 30. Drizzle. High 69°21°, low 52°11°. Typical 66°19° / 42°6°. Rain 0.02 in0.5 mm, 10% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 54°12°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 68°20°
  Dry
3. Evening
  6 PM–midnight
  Drizzle, 58°14°
  Dry
4. Overnight
  midnight–6 AM
  Drizzle, 51°10°
  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
62°17°–74°23°
Low, likely
44°7°–55°13°
Typical high / low
66°19° / 42°6°
Wind
10 mph16 km/h, gusts 17 mph27 km/h
UV peak
2
Saturday, Oct 31. Cloudy. High 66°19°, low 52°11°. Typical 66°19° / 42°6°. Rain 0.15 in3.8 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 52°11°
  20% chance · 0.02 in0.6 mm
2. Afternoon
  noon–6 PM
  Cloudy, 65°18°
  30% chance
3. Evening
  6 PM–midnight
  Cloudy, 60°16°
  30% chance
4. Overnight
  midnight–6 AM
  Cloudy, 56°13°
  30% chance · 0.01 in0.3 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
59°15°–70°21°
Low, likely
47°8°–59°15°
Typical high / low
66°19° / 42°6°
Wind
13 mph21 km/h, gusts 21 mph34 km/h
UV peak
1
Sunday, Nov 1. Cloudy. High 69°21°, low 56°13°. Typical 65°18° / 42°6°. Rain 0.18 in4.6 mm, 30% chance. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 57°14°
  30% chance · 0.01 in0.3 mm
2. Afternoon
  noon–6 PM
  Partly sunny, 69°20°
  30% chance
3. Evening
  6 PM–midnight
  Cloudy, 61°16°
  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
67°19°–71°22°
Low, likely
53°12°–59°15°
Typical high / low
65°18° / 42°6°
Wind
12 mph19 km/h, gusts 24 mph39 km/h
UV peak
3

10 days15 days30 days

The outlook

Today
Dry, high 76°, low 48°.
Tomorrow
Dry, high 76°, low 47°.
Sunday
Dry, high 77°, low 50°.
Rest of week
Mostly dry, highs 66–77°.

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

17 mi

Below flood stage

Level: 8.0 ft
Flow: 128,000 cfs

Forecast peak 7.6 ft Fri 1 PM

Reading from Fri 6:30 AM · NWS gauge page

Mississippi River at St. Louis

17 mi

Below flood stage

Level: 8.7 ft
Flow: 179,000 cfs

Forecast peak 8.5 ft Fri 1 PM

Reading from Fri 6:30 AM · NWS gauge page

Silver Creek near Mascoutah

14 mi

Level: 8.0 ft
Flow: 1,460 cfs

Reading from Fri 6:45 AM · NWS gauge page

Mississippi River at Alton

19 mi

Below flood stage

Level: 18.7 ft

Reading from Fri 6:30 AM · NWS gauge page

For your home

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

Heating this week

About 79% less heating than a typical week.

This week 14Typical 64

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 48°F).

Open the windows?

Today, 10:00 AM–8:00 PM

Good stretch to open the windows.

Is this typical?

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

Oct 23, today vs a typical year

Today’s expected high is 6°3° warmer than typical.

Last 7 days vs normal

On average 8°4° colder than normal (daily mean temperature).

−7°−4°SatOct 17
—SunOct 18
—MonOct 19
—TueOct 20
—WedOct 21
—ThuOct 22
—FriOct 23

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

Sun & moon

Sun

Daylight: 10 h 53 min; Losing 2 min 21 s a day; shortest Dec 21, 1 h 26 min less
Golden hour: 5:33–6:26 PM; Morning 7:00–7:53 AM
Blue hour: 6:26–6:37 PM; Morning 6:49–7:00 AM; first light 6:49 AM

Stars tonight? Fair

Mostly clear 6:37 PM–12 AM, but the moon is 95% lit and up.

Moon

Waxing gibbous

91% lit · growing

Today: sets 4:25 AM · rises 4:40 PM
Full moon: Oct 25
New moon: Nov 9

Looking west from Troy. The highest point on the skyline is about 3,200 ft, 20 mi away.Skyline from USGS elevation data, heights drawn up to 6× taller. Sky, sun and moon as they are now.

Troy, IL weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Sunday

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

Mississippi River at Alton

For your home

Heating this week

Heat-pump hours, next 7 days

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