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Weather Conditions for Alcoa Center, Pennsylvania : Westmoreland County
Issued: 1:01 pm EDT Sep 4, 2026 Latitude: 40.5384 Longitude: -79.6450454 View on Google Maps

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This Afternoon Tonight Saturday Sunday Labor Day Tuesday Wednesday Thursday
60% chance of thunderstorms on This Afternoon 70% chance of thunderstorms on Tonight 40% chance of thunderstorms on Saturday Sunny on Sunday Sunny on Labor Day Mostly Sunny on Tuesday Partly Sunny on Wednesday 50% chance of thunderstorms on Thursday
High: 83°F Low: 65°F High: 79°F High: 78°F High: 79°F High: 81°F High: 83°F High: 81°F
Low: 58°F Low: 56°F Low: 58°F Low: 63°F Low: 67°F  
Thunderstorms Thunderstorms Thunderstorms Sunny Sunny Mostly Sunny Partly Sunny Thunderstorms
Current Conditions at
ALLEGHENY COUNTY ARPT - (KAGC)
75°
Cloudy
Light Thunderstorm Rain Mist
as of 12:11 PM EDST
Rel. Humidity: 88%
Dew Point: 72°F
Visibility: 5 Miles
Pressure: 30.05 in.
Flight Rule: MVFR
Wind Data
5 MPH
300° Northwest
Cloud Level(s): Broken at 1800ft, Solid Overcast at 2300ft
Current Conditions at
BUTLER COUNTY - (KBTP)
72°
Mostly Cloudy
Light Rain
as of 12:28 PM EDST
Rel. Humidity: 5%
Visibility: 10 Miles
Pressure: 30.06 in.
Flight Rule: MVFR
Wind Data
6 MPH
230° Southwest
Cloud Level(s): Few at 600ft, Broken at 1400ft, Broken at 4100ft
Current Conditions at
STEWART FIELD - (KIDI)
73°
Mostly Cloudy
as of 12:35 PM EDST
Rel. Humidity: 88%
Dew Point: 70°F
Visibility: 10 Miles
Pressure: 30.07 in.
Flight Rule: VFR
Wind Data
9 MPH
280° West
Cloud Level(s): Scattered at 1600ft, Scattered at 2200ft, Broken at 5000ft
60% chance of thunderstorms This Afternoon This Afternoon... A chance of showers and thunderstorms before 2pm, then showers likely and possibly a thunderstorm between 2pm and 4pm, then a chance of showers and thunderstorms after 4pm. Mostly cloudy, with a high near 83. West wind 6 to 8 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

70% chance of thunderstorms Tonight Tonight... Showers and thunderstorms likely, mainly before 10pm, then showers likely and possibly a thunderstorm after 11pm. Mostly cloudy, with a low around 65. West wind around 5 mph becoming calm in the evening. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

40% chance of thunderstorms Saturday Saturday... A chance of showers, with thunderstorms also possible after 2pm. Patchy fog between 7am and 8am. Otherwise, mostly cloudy, with a high near 79. Calm wind becoming north 5 to 7 mph in the afternoon. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

30% chance of thunderstorms Saturday Night Saturday Night... A chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 58. Northeast wind 6 to 8 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Sunny on Sunday Sunday... Sunny, with a high near 78. Northeast wind around 8 mph.

Mostly Clear on Sunday Night Sunday Night... Mostly clear, with a low around 56.

Sunny on Labor Day Labor Day... Sunny, with a high near 79.

Cloudy on Monday Night Monday Night... Partly cloudy, with a low around 58.

Mostly Sunny on Tuesday Tuesday... Mostly sunny, with a high near 81.

Mostly Cloudy on Tuesday Night Tuesday Night... Mostly cloudy, with a low around 63.

Partly Sunny on Wednesday Wednesday... Partly sunny, with a high near 83.

50% chance of rain Wednesday Night Wednesday Night... A chance of showers. Mostly cloudy, with a low around 67. Chance of precipitation is 50%.

50% chance of thunderstorms Thursday Thursday... A chance of showers and thunderstorms. Partly sunny, with a high near 81. Chance of precipitation is 50%.

Current Radar Image


Sun Almanac for Alcoa Center, Pennsylvania
Astronomical Sunrise 05:14 AM?Astronomical sunrise occurs when the Sun is 18° below the horizon and the sky begins to brighten from a completly darkened state.
Nautical Sunrise 05:48 AM?Nautical sunrise (or nautical dawn) is the precise moment when the sun's center is 12° below the horizon in the morning. It marks the beginning of nautical twilight, allowing pilots/mariners to see the horizon.
Civil Sunrise 06:21 AM?Civil sunrise is the moment in the morning when the sun's center is 6° below the horizon. It marks the start of morning civil twilight, providing enough natural light for most, outdoor activities without artificial lighting. It typically occurs roughly 20-30 minutes before actual sunrise.
Sunrise 06:49 AM?Sunrise (or sunup) is the moment when the upper rim of the Sun appears on the horizon in the morning. It marks the end of the twilight phase, often accompanied by distinct atmospheric colors.

Daylight: 12 Hours 57 Minutes?Daylight hours are the period of time between local sunrise and sunset, representing the daily portion of sunlight. These hours change in length based on season, Earth's tilt, and latitude.

Sunset 7:46 PM?The sunset is defined in astronomy as the moment the upper limb of the Sun disappears below the horizon. It marks the end of daylight and is often accompanied by distinct atmospheric colors. It also signals the beginning of twilight.
Civil Sunset 8:14 PM?Civil sunset (or evening civil twilight) occurs when the center of the sun is 6° below the horizon, marking the end of the brightest twilight phase. It typically occurs roughly 20-30 minutes after sunset, providing enough light for most outdoor activities to continue without artificial light.
Nautical Sunset 8:47 PM?Nautical sunset occurs when the sun's center is 12° below the horizon, marking the end of nautical twilight. This phase, following civil twilight, allows the horizon to remain visible, enabling mariners to take accurate star sights for navigation. The sky is dark, but some ambient light remains
Astronomical Sunset 9:21 PM?Astronomical sunrise occurs when the Sun drops to 18° below the horizon. This causes the sky to enter a completly darkened state.

Civil Rise to Set: 13 Hours 53 Minutes
Nautical Rise to Set: 14 Hours 59 Minutes
Astro Rise to Set: 16 Hours 7 Minutes

Click for yearly Sun Almanac for Alcoa Center
Moon Almanac for Alcoa Center, Pennsylvania
Moon Phase: Last Quarter
Moon Illumination: 46%
Moon Age: 22.5 Days
Moon is currently above the horizon
Distance from Moon to Earth: 225,973 miles
Upcoming Lunar Events for
Alcoa Center:
Next EventEvent TimeIllum

Moonset:03:18 pm Fri44.5%
Moonrise:12:06 am Sat40.3%
High Moon:08:14 am Sat36.5%
Moonset:04:21 pm Sat32.7%
New Moon: Wed Aug 12
First Quarter: Wed Aug 19
Full Moon: Fri Aug 28
Last Quarter: Fri Sep 4
New Moon: Thu Sep 10
Click for Monthly Moon Almanac
Pennsylvania's Current Temperatures
Pennsylvania's Current Temperature Map


Pennsylvania's Satellite ImagePennsylvania Satellite Image

Pennsylvania's Current Wind DirectionPennsylvania's Current Wind Direction

National Summary
of upper and lower values of current conditions amongst 5326 locations
in the contiguous United States
High
Temp
99° Mount Carmel Municipal, Illinois
and 3 other locations
Low
Temp
39° Mullan Pass, Idaho
Wind
Speed
28mph Tooele, Utah
and 1 other location
Wind
Gust
39mph Tooele, Utah
Wind
Chill
41° Berthoud Pass, Colorado
Heat
Index
118° Vidalia/Concordi, Louisiana
High
Pressure
30.72Hg Salida Mountain, Colorado
Low
Pressure
29.74Hg Malta, Montana
# Locations Reporting Rain 44
# Locations Reporting Thunderstorms / Lightning 22
# Locations Reporting Fog 5
Average Temperature in the Contiguous USA 81°
Pennsylvania State Summary
of upper and lower values of current conditions amongst 21 locations
in Pennsylvania
High
Temp
82° Bedford
and 1 other location
Low
Temp
72° Butler County
and 4 other locations
Wind
Speed
9mph Stewart Field
and 4 other locations
Wind
Gust
14mph Wellsboro/Grand
High
Pressure
30.08Hg Somerset
Low
Pressure
29.93Hg Lehighton
and 3 other locations
Average temperature in Pennsylvania 77°
# Locations Reporting Rain 4
# Locations Reporting MVFR
(Marginal Visual Flight Rules)
1
# Locations Reporting VFR
(Visual Flight Rules)
20