Allegheny County, PA Weather Forecast
County weather hub
Mostly Sunny
Compare major city weather across Allegheny County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
Mostly sunny, with a high near 73. West wind 6 to 12 mph.
County Weather Overview
This county weather page brings together forecast coverage for Allegheny County so visitors can compare temperatures, wind, and conditions across the region without hopping between unrelated pages.
Current forecast coverage spans 77 of 77 mapped cities in Allegheny County.
Page Snapshot
- Page focus
- county weather
- Forecast window
- Aug 24 to Aug 29, 2026
- Latest sync
- Aug 23, 2026 6:06 PM EDT
- Forecast office
- PBZ
- Source
- NOAA / NWS
Daily Outlook
This Week in Allegheny County
Thursday looks like the warmest upcoming period in Allegheny County at 84 degrees F.
Monday Night is the coolest period ahead with temperatures near 57 degrees F.
The strongest winds are forecast for Monday at about 6 to 12 mph W.
Precipitation is mentioned in 2 upcoming forecast periods.
Forecast Details
- Last updated
- Aug 23, 2026 6:06 PM EDT
- Coverage
- 6 days
- Time zone
- America/New_York
- Forecast office
- PBZ
- Radar station
- KPBZ
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Partly cloudy, with a low around 57. West wind 2 to 10 mph.
Mostly sunny, with a high near 79. West wind 2 to 7 mph.
Partly cloudy, with a low around 58.
Mostly sunny, with a high near 81.
Partly cloudy, with a low around 63.
A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 84. Chance of precipitation is 40%.
A chance of showers and thunderstorms before 8pm, then a chance of showers and thunderstorms between 8pm and 2am. Mostly cloudy, with a low around 65. Chance of precipitation is 40%.
Mostly sunny, with a high near 82.
Partly cloudy, with a low around 62.
Mostly sunny, with a high near 81.
Partly cloudy, with a low around 62.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Monday
Aug 24
|
Mostly Sunny
|
73°F |
6 to 12 mph
W
|
|
Monday Night
Aug 24
|
Partly Cloudy
|
57°F |
2 to 10 mph
W
|
|
Tuesday
Aug 25
|
Mostly Sunny
|
79°F |
2 to 7 mph
W
|
|
Tuesday Night
Aug 25
|
Partly Cloudy
|
58°F |
0 to 6 mph
N
|
|
Wednesday
Aug 26
|
Mostly Sunny
|
81°F |
0 to 5 mph
SE
|
|
Wednesday Night
Aug 26
|
Partly Cloudy
|
63°F |
3 mph
S
|
|
Thursday
Aug 27
|
Partly Sunny then Chance Showers And Thunderstorms
|
84°F |
2 to 9 mph
SW
|
|
Thursday Night
Aug 27
|
Chance Showers And Thunderstorms
|
65°F |
1 to 7 mph
SW
|
|
Friday
Aug 28
|
Mostly Sunny
|
82°F |
1 to 7 mph
SW
|
|
Friday Night
Aug 28
|
Partly Cloudy
|
62°F |
1 to 7 mph
N
|
|
Saturday
Aug 29
|
Mostly Sunny
|
81°F |
1 to 5 mph
N
|
|
Saturday Night
Aug 29
|
Partly Cloudy
|
62°F |
3 mph
NE
|
Major City Forecasts
Live forecast snapshots for major cities across Allegheny County.
Coverage
Forecast coverage currently spans 77 of 77 mapped cities in Allegheny County.
Largest mapped city population in this region: 299,226.
