Allegheny County, PA Weather Forecast
County weather hub
Chance Rain Showers
Compare major city weather across Allegheny County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
A chance of rain showers before 3pm. Mostly cloudy, with a high near 64. East wind around 14 mph. Chance of precipitation is 50%.
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
- Sep 23 to Sep 28, 2026
- Latest sync
- Sep 22, 2026 9:10 AM EDT
- Forecast office
- PBZ
- Source
- NOAA / NWS
Daily Outlook
This Week in Allegheny County
Monday looks like the warmest upcoming period in Allegheny County at 74 degrees F.
Thursday Night is the coolest period ahead with temperatures near 47 degrees F.
The strongest winds are forecast for Wednesday at about 14 mph E.
Precipitation is mentioned in 2 upcoming forecast periods.
Forecast Details
- Last updated
- Sep 22, 2026 9:10 AM 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
A slight chance of rain showers between 8pm and 2am. Mostly cloudy, with a low around 51. East wind 7 to 12 mph, with gusts as high as 23 mph. Chance of precipitation is 20%.
Mostly sunny, with a high near 67. East wind around 10 mph.
Mostly clear, with a low around 47.
Sunny, with a high near 69.
Mostly clear, with a low around 49.
Sunny, with a high near 70.
Mostly clear, with a low around 50.
Sunny, with a high near 71.
Partly cloudy, with a low around 52.
Mostly sunny, with a high near 74.
Partly cloudy, with a low around 55.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Wednesday
Sep 23
|
Chance Rain Showers
|
64°F |
14 mph
E
|
|
Wednesday Night
Sep 23
|
Slight Chance Rain Showers
|
51°F |
7 to 12 mph
E
|
|
Thursday
Sep 24
|
Mostly Sunny
|
67°F |
10 mph
E
|
|
Thursday Night
Sep 24
|
Mostly Clear
|
47°F |
3 to 8 mph
NE
|
|
Friday
Sep 25
|
Sunny
|
69°F |
5 to 9 mph
NE
|
|
Friday Night
Sep 25
|
Mostly Clear
|
49°F |
5 to 9 mph
N
|
|
Saturday
Sep 26
|
Sunny
|
70°F |
5 to 13 mph
N
|
|
Saturday Night
Sep 26
|
Mostly Clear
|
50°F |
3 to 12 mph
N
|
|
Sunday
Sep 27
|
Sunny
|
71°F |
5 to 9 mph
NW
|
|
Sunday Night
Sep 27
|
Partly Cloudy
|
52°F |
1 to 8 mph
NW
|
|
Monday
Sep 28
|
Mostly Sunny
|
74°F |
3 mph
N
|
|
Monday Night
Sep 28
|
Partly Cloudy
|
55°F |
0 to 3 mph
N
|
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.
