Observed 9:30 PM EDT at KAOO

St. Clair, PA weather

Clear and 45°7°.

Forecasts agree

Now 45°7°

Clear

Wind: Calm; Light through 9 AM
Dew point: 30°−1°; Dry, static shocks likely
UV tomorrow: 4Moderate; Moderate 11 AM–5 PM · peak 4
Air quality: 34Good; Main pollutant: PM2.5 (fine particles)
Pressure: 30.53 inHg1034 hPa; Rising slowly · +0.04 inHg+1.3 hPa in 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

4°2° cooler than this time yesterday (48°9° then, 44°7° now)

Good hours for

Below freezing tonight 5–9 AM (low 31°−1°)
Above 50°10° tomorrow by 11 AM
High 65°18° tomorrow at 4 PM
Drops 12°7° tomorrow night 6–9 PM (60°16° → 48°9°)
Below 50°10° tomorrow night after 8 PM

TonightDown to 32°0° by 5 AM · freezing, low 32°0° · Clear
Tomorrow morningUp to 51°11° by 11 AM · freezing, low 31°−1° · Clear
Tomorrow afternoonUp to 65°18° by 4 PM · Clear
Tomorrow nightDown to 36°2° by 5 AM · Clear
Monday morningUp to 57°14° by 11 AM · Clear
Monday afternoonUp to 70°21° by 4 PM · Clear

Hourly forecast, next 47 hours, in the place's local time
Hour	Conditions	Temperature	Feels like	Precipitation	Wind	Humidity	Cloud cover	UV index
Sat 9p	Clear	42°6° (likely 42°6° to 48°9°)	42°6°	0%	0 mph0 km/h, gusts 4 mph6 km/h	82%	0%	0
Sat 10p	Clear	40°4° (likely 40°4° to 46°8°)	40°4°	0%	0 mph0 km/h, gusts 3 mph5 km/h	89%	0%	0
Sat 11p	Clear	38°3° (likely 38°3° to 44°7°)	38°3°	0%	0 mph0 km/h, gusts 3 mph4 km/h	96%	0%	0
Sun 12a	Clear	36°2° (likely 36°2° to 44°7°)	36°2°	0%	0 mph0 km/h, gusts 2 mph3 km/h	100%	0%	0
Sun 1a	Clear	35°2° (likely 35°2° to 43°6°)	35°2°	0%	0 mph0 km/h, gusts 2 mph3 km/h	100%	0%	0
Sun 2a	Clear	35°2° (likely 35°2° to 43°6°)	35°2°	0%	0 mph0 km/h, gusts 2 mph3 km/h	100%	0%	0
Sun 3a	Clear	34°1° (likely 34°1° to 42°6°)	34°1°	0%	0 mph0 km/h, gusts 2 mph3 km/h	100%	0%	0
Sun 4a	Clear	33°1° (likely 33°1° to 41°5°)	33°1°	0%	0 mph0 km/h, gusts 1 mph2 km/h	100%	0%	0
Sun 5a	Clear	32°0° (likely 32°0° to 40°4°)	32°0°	0%	0 mph0 km/h, gusts 1 mph2 km/h	100%	0%	0
Sun 6a	Clear	32°0° (likely 32°0° to 39°4°)	32°0°	0%	0 mph0 km/h, gusts 2 mph3 km/h	100%	0%	0
Sun 7a	Clear	31°−1° (likely 31°−1° to 39°4°)	31°−1°	0%	0 mph0 km/h, gusts 3 mph4 km/h	100%	0%	0
Sun 8a	Sunny	31°−1° (likely 31°−1° to 39°4°)	31°−1°	0%	0 mph0 km/h, gusts 2 mph4 km/h	100%	0%	0
Sun 9a	Sunny	35°2° (likely 35°2° to 42°6°)	35°2°	0%	0 mph0 km/h, gusts 2 mph3 km/h	96%	0%	1
Sun 10a	Sunny	43°6° (likely 43°6° to 49°9°)	43°6°	0%	0 mph0 km/h, gusts 6 mph9 km/h	93%	0%	1
Sun 11a	Sunny	51°11° (likely 51°11° to 54°12°)	51°11°	0%	0 mph0 km/h, gusts 10 mph15 km/h	74%	0%	3
Sun 12p	Sunny	56°13° (likely 56°13° to 58°14°)	56°13°	0%	2 mph3 km/h from S, gusts 10 mph17 km/h	64%	0%	4
Sun 1p	Sunny	61°16° (likely 59°15° to 61°16°)	61°16°	0%	2 mph3 km/h from S, gusts 11 mph17 km/h	53%	0%	4
Sun 2p	Sunny	63°17° (likely 60°16° to 63°17°)	63°17°	0%	3 mph5 km/h from S, gusts 10 mph16 km/h	48%	2%	4
Sun 3p	Sunny	63°17° (likely 62°17° to 63°17°)	63°17°	0%	2 mph3 km/h from S, gusts 9 mph14 km/h	48%	2%	3
Sun 4p	Sunny	65°18° (likely 61°16° to 65°18°)	65°18°	0%	2 mph3 km/h from S, gusts 9 mph14 km/h	45%	2%	3
Sun 5p	Sunny	63°17° (likely 60°16° to 63°17°)	63°17°	0%	1 mph2 km/h from S, gusts 8 mph14 km/h	48%	2%	1
Sun 6p	Clear	60°16° (likely 55°13° to 60°16°)	60°16°	0%	1 mph2 km/h from SE, gusts 7 mph12 km/h	53%	0%	0
Sun 7p	Clear	55°13° (likely 51°11° to 55°13°)	55°13°	0%	0 mph0 km/h, gusts 6 mph9 km/h	64%	0%	0
Sun 8p	Clear	48°9° (likely 48°9° to 51°11°)	48°9°	0%	0 mph0 km/h, gusts 4 mph7 km/h	83%	6%	0
Sun 9p	Clear	45°7° (likely 45°7° to 49°9°)	45°7°	0%	0 mph0 km/h, gusts 4 mph6 km/h	93%	39%	0
Sun 10p	Clear	43°6° (likely 43°6° to 48°9°)	43°6°	0%	1 mph2 km/h from SW, gusts 3 mph5 km/h	100%	10%	0
Sun 11p	Mostly clear	41°5° (likely 41°5° to 47°8°)	41°5°	0%	1 mph2 km/h from SW, gusts 3 mph5 km/h	100%	43%	0
Mon 12a	Clear	40°4° (likely 40°4° to 46°8°)	40°4°	0%	1 mph2 km/h from SW, gusts 3 mph5 km/h	100%	33%	0
Mon 1a	Clear	39°4° (likely 39°4° to 45°7°)	39°4°	0%	1 mph2 km/h from W, gusts 3 mph5 km/h	100%	40%	0
Mon 2a	Clear	39°4° (likely 37°3° to 45°7°)	39°4°	0%	0 mph0 km/h, gusts 4 mph7 km/h	100%	10%	0
Mon 3a	Partly cloudy	38°3° (likely 36°2° to 44°7°)	38°3°	0%	0 mph0 km/h, gusts 5 mph8 km/h	100%	19%	0
Mon 4a	Clear	37°3° (likely 35°2° to 43°6°)	37°3°	0%	0 mph0 km/h, gusts 5 mph8 km/h	100%	12%	0
Mon 5a	Clear	36°2° (likely 35°2° to 42°6°)	36°2°	0%	1 mph2 km/h from W, gusts 5 mph9 km/h	100%	16%	0
Mon 6a	Clear	36°2° (likely 35°2° to 42°6°)	36°2°	0%	1 mph2 km/h from W, gusts 5 mph8 km/h	100%	19%	0
Mon 7a	Clear	35°2° (likely 35°2° to 43°6°)	35°2°	0%	1 mph2 km/h from W, gusts 4 mph7 km/h	100%	16%	0
Mon 8a	Partly sunny	36°2° (likely 36°2° to 43°6°)	36°2°	0%	1 mph2 km/h from W, gusts 4 mph6 km/h	100%	39%	0
Mon 9a	Sunny	40°4° (likely 40°4° to 46°8°)	40°4°	0%	1 mph2 km/h from W, gusts 4 mph6 km/h	100%	12%	1
Mon 10a	Sunny	49°9° (likely 49°9° to 54°12°)	49°9°	0%	1 mph2 km/h from W, gusts 5 mph8 km/h	83%	7%	1
Mon 11a	Sunny	57°14° (likely 57°14° to 61°16°)	57°14°	0%	1 mph2 km/h from W, gusts 9 mph14 km/h	72%	0%	3
Mon 12p	Sunny	61°16° (likely 61°16° to 65°18°)	61°16°	0%	2 mph3 km/h from W, gusts 9 mph15 km/h	62%	6%	4
Mon 1p	Sunny	65°18° (likely 65°18° to 67°19°)	65°18°	0%	3 mph5 km/h from NW, gusts 12 mph19 km/h	56%	9%	4
Mon 2p	Sunny	69°21° (likely 66°19° to 69°21°)	69°21°	0%	5 mph8 km/h from NW, gusts 12 mph20 km/h	49%	12%	4
Mon 3p	Sunny	69°21° (likely 67°19° to 70°21°)	69°21°	0%	5 mph8 km/h from NW, gusts 14 mph22 km/h	49%	12%	3
Mon 4p	Sunny	70°21° (likely 66°19° to 70°21°)	70°21°	0%	5 mph8 km/h from NW, gusts 14 mph23 km/h	47%	6%	2
Mon 5p	Sunny	70°21° (likely 63°17° to 70°21°)	70°21°	0%	5 mph8 km/h from NW, gusts 15 mph24 km/h	47%	1%	1
Mon 6p	Clear	66°19° (likely 57°14° to 66°19°)	66°19°	0%	3 mph5 km/h from NW, gusts 7 mph12 km/h	54%	1%	0
Mon 7p	Clear	62°17° (likely 53°12° to 62°17°)	62°17°	0%	3 mph5 km/h from W, gusts 5 mph8 km/h	60%	2%	0

Days ahead

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

Today, Oct 24. Sunny. High 61°16°, low 31°−1°. Typical 60°16° / 41°5°. Dry. Forecasts agree.
1. Evening
  6 PM–midnight
  Clear, 38°3°
  Dry
2. Overnight
  midnight–6 AM
  Clear, 32°0°
  Dry
Official NWS forecast
Tonight: Widespread frost after midnight. Clear, with a low around 31. Wind around 0 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
60°16°–61°16°
Low, likely
31°−1°–40°4°
Typical high / low
60°16° / 41°5°
Wind
7 mph11 km/h, gusts 18 mph29 km/h
UV peak
4
Tomorrow, Oct 25. Mostly sunny. High 65°18°, low 35°2°. Typical 59°15° / 40°4°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 31°−1°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 65°18°
  Dry
3. Evening
  6 PM–midnight
  Clear, 48°9°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 36°2°
  Dry
Official NWS forecast
Day: Widespread frost before 10am. Sunny, with a high near 65. South wind 0 to 3 mph.
Night: Patchy frost after 4am. Mostly clear, with a low around 35. Southwest wind around 1 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
62°17°–65°18°
Low, likely
34°1°–39°4°
Typical high / low
59°15° / 40°4°
Wind
6 mph10 km/h, gusts 14 mph23 km/h
UV peak
4
Monday, Oct 26. Mostly sunny. High 71°22°, low 41°5°. Typical 59°15° / 40°4°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 36°2°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 70°21°
  Dry
3. Evening
  6 PM–midnight
  Clear, 54°12°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 46°8°
  Dry
Official NWS forecast
Day: Patchy frost before 9am. Sunny, with a high near 71. West wind 1 to 5 mph.
Night: Mostly clear, with a low around 41. Northwest wind 0 to 3 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
67°19°–71°22°
Low, likely
33°1°–41°5°
Typical high / low
59°15° / 40°4°
Wind
8 mph13 km/h, gusts 20 mph31 km/h
UV peak
4
Tuesday, Oct 27. Mostly sunny. High 66°19°, low 36°2°. Typical 58°14° / 40°4°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 45°7°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 63°17°
  Dry
3. Evening
  6 PM–midnight
  Clear, 51°11°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 43°6°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 66.
Night: Patchy frost after 5am. Partly cloudy, with a low around 36.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
62°17°–66°19°
Low, likely
36°2°–46°8°
Typical high / low
58°14° / 40°4°
Wind
4 mph7 km/h, gusts 12 mph19 km/h
UV peak
4
Wednesday, Oct 28. Mostly cloudy. High 65°18°, low 41°5°. Typical 58°14° / 40°4°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Partly sunny, 43°6°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 61°16°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 53°12°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 45°7°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Patchy frost before 9am. Partly sunny, with a high near 65.
Night: Mostly cloudy, with a low around 41.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
59°15°–65°18°
Low, likely
41°5°–43°6°
Typical high / low
58°14° / 40°4°
Wind
9 mph14 km/h, gusts 19 mph30 km/h
UV peak
3
Thursday, Oct 29. Mostly sunny. High 73°23°, low 44°7°. Typical 58°14° / 39°4°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 43°6°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 71°22°
  Dry
3. Evening
  6 PM–midnight
  Clear, 56°13°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 47°9°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 73.
Night: Mostly clear, with a low around 44.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
69°21°–73°23°
Low, likely
41°5°–45°7°
Typical high / low
58°14° / 39°4°
Wind
7 mph11 km/h, gusts 24 mph39 km/h
UV peak
4
Friday, Oct 30. Mostly sunny. High 74°23°, low 44°7°. Typical 57°14° / 39°4°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 48°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 71°22°
  Dry
3. Evening
  6 PM–midnight
  Mostly clear, 56°14°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 46°8°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 74.
Night: Partly cloudy, with a low around 44.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
70°21°–74°23°
Low, likely
40°4°–51°11°
Typical high / low
57°14° / 39°4°
Wind
7 mph11 km/h, gusts 20 mph31 km/h
UV peak
4
Saturday, Oct 31. Partly sunny. High 72°22°, low 45°7°. Typical 57°14° / 39°4°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 45°7°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 68°20°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 57°14°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 51°11°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 72.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
59°15°–72°22°
Low, likely
40°4°–51°11°
Typical high / low
57°14° / 39°4°
Wind
8 mph12 km/h, gusts 17 mph27 km/h
UV peak
3
Sunday, Nov 1. Drizzle. High 65°18°, low 50°10°. Typical 56°13° / 38°3°. Rain 0.09 in2.3 mm, 40% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Drizzle, 53°11°
  30% chance · 0.01 in0.3 mm
2. Afternoon
  noon–6 PM
  Cloudy, 64°18°
  30% chance · 0.03 in0.8 mm
3. Evening
  6 PM–midnight
  Drizzle, 61°16°
  40% chance · 0.11 in2.8 mm
4. Overnight
  midnight–6 AM
  Drizzle, 60°16°
  40% chance · 0.1 in2.6 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°–68°20°
Low, likely
48°9°–55°13°
Typical high / low
56°13° / 38°3°
Wind
10 mph15 km/h, gusts 24 mph39 km/h
UV peak
3
Monday, Nov 2. Drizzle. High 68°20°, low 57°14°. Typical 56°13° / 38°3°. Rain 0.31 in7.9 mm, 40% chance. Mostly agree.
1. Morning
  6 AM–noon
  Drizzle, 63°17°
  40% chance · 0.01 in0.4 mm
2. Afternoon
  noon–6 PM
  Sunny, 69°20°
  30% chance · 0.1 in2.6 mm
3. Evening
  6 PM–midnight
  Drizzle, 60°16°
  30% chance · 0.07 in1.7 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°–71°22°
Low, likely
54°12°–62°17°
Typical high / low
56°13° / 38°3°
Wind
15 mph24 km/h, gusts 38 mph61 km/h
UV peak
3

10 days15 days30 days

The outlook

Today
Dry, high 61°, low 31°.
Tomorrow
Dry, high 65°, low 35°, warming up.
Monday
Dry, high 71°, low 41°, warming up.
Rest of week
Highs 65–74°; chance of precipitation on Sunday, Monday.

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

Frankstown Branch Juniata River at Williamsburg

1.8 mi

Below flood stage

Level: 3.0 ft
Flow: 194 cfs

Forecast peak 3.0 ft Sun 2 AM

Reading from Sat 8:30 PM · NWS gauge page

Little Juniata River at Spruce Creek

10 mi

Below flood stage

Level: 2.2 ft
Flow: 155 cfs

Forecast peak 2.2 ft Sun 2 AM

Reading from Sat 8:15 PM · NWS gauge page

Juniata River at Huntingdon

11 mi

Below flood stage

Level: 1.8 ft
Flow: 516 cfs

Forecast peak 1.8 ft Sun 2 AM

Reading from Sat 8 PM · NWS gauge page

Juniata River at Mapleton Depot

17 mi

Below flood stage

Level: 4.6 ft
Flow: 2,310 cfs

Forecast peak 4.6 ft Sun 2 AM

Reading from Sat 8:15 PM · NWS gauge page

For your home

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

Heating this week

About 69% less heating than a typical week.

This week 34Typical 111

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 26
h below 17°F: 0
h below 5°F: 0

47, 17 and 5°F are the test points heat pumps are rated at. About 23 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 30°F).

Open the windows?

Sun, 1:00 PM–6:00 PM

Good stretch to open the windows.

Is this typical?

Altoona Blair County Airport · official normals 1991–2020 · records 1948–2026

Oct 24, today vs a typical year

Today’s expected high is about typical for the date.

Last 7 days vs normal

On average 2°1° colder than normal (daily mean temperature).

−3°−2°MonOct 19
−1°TueOct 20
−2°−1°WedOct 21
−2°−1°ThuOct 22
−1°FriOct 23
—SatOct 24
—SunOct 25

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

Sun & moon

Sun

Daylight: 10 h 46 min; Losing 2 min 30 s a day; shortest Dec 21, 1 h 29 min less
Golden hour: 5:41–6:36 PM; Morning 7:16–8:11 AM
Blue hour: 6:36–6:47 PM; Morning 7:05–7:16 AM; first light 7:05 AM

Stars tonight? Fair

Clear 9:49 PM–7:06 AM, but the moon is 99% lit and up.

Moon

Waxing gibbous

98% lit · growing

Today: sets 5:45 AM · rises 5:16 PM
Full moon: Oct 26
New moon: Nov 9

Looking northwest from St. Clair. The highest point on the skyline is about 1,800 ft, 1 mi away.Skyline from USGS elevation data, heights drawn up to 2× taller. Sky, sun and moon as they are now.

St. Clair, PA weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Monday

Rest of week

What changed since yesterday

Radar

Rivers

Frankstown Branch Juniata River at Williamsburg

Little Juniata River at Spruce Creek

Juniata River at Huntingdon

Juniata River at Mapleton Depot

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