Allegheny County, PA Weather Forecast
County weather hub
Patchy Fog then Mostly Cloudy
Compare major city weather across Allegheny County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
Patchy fog and isolated rain showers before 11am. Mostly cloudy, with a high near 80. Northwest wind 1 to 5 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
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
- May 25 to May 30, 2026
- Latest sync
- May 24, 2026 11:12 AM EDT
- Forecast office
- PBZ
- Source
- NOAA / NWS
Daily Outlook
This Week in Allegheny County
Tuesday looks like the warmest upcoming period in Allegheny County at 85 degrees F.
Friday Night is the coolest period ahead with temperatures near 54 degrees F.
The strongest winds are forecast for Friday at about 2 to 12 mph N.
Precipitation is mentioned in 7 upcoming forecast periods.
Forecast Details
- Last updated
- May 24, 2026 11:12 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
Mostly cloudy, with a low around 61. North wind 0 to 3 mph.
A slight chance of showers and thunderstorms after 2pm. Mostly cloudy, with a high near 85. Southeast wind around 2 mph. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 65. Chance of precipitation is 20%.
A chance of rain showers before 2pm, then a chance of showers and thunderstorms. Mostly cloudy, with a high near 83. Chance of precipitation is 50%.
A chance of showers and thunderstorms. Mostly cloudy, with a low around 64. Chance of precipitation is 50%.
A slight chance of rain showers. Partly sunny, with a high near 81.
A slight chance of rain showers before 8pm. Partly cloudy, with a low around 57.
Mostly sunny, with a high near 76.
Partly cloudy, with a low around 54.
Mostly sunny, with a high near 75.
Partly cloudy, with a low around 55.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Memorial Day
May 25
|
Patchy Fog then Mostly Cloudy
|
80°F |
1 to 5 mph
NW
|
|
Monday Night
May 25
|
Mostly Cloudy
|
61°F |
0 to 3 mph
N
|
|
Tuesday
May 26
|
Mostly Cloudy then Slight Chance Showers And Thunderstorms
|
85°F |
2 mph
SE
|
|
Tuesday Night
May 26
|
Slight Chance Showers And Thunderstorms
|
65°F |
2 mph
SE
|
|
Wednesday
May 27
|
Chance Rain Showers then Chance Showers And Thunderstorms
|
83°F |
0 to 5 mph
W
|
|
Wednesday Night
May 27
|
Chance Showers And Thunderstorms
|
64°F |
1 to 5 mph
NW
|
|
Thursday
May 28
|
Slight Chance Rain Showers
|
81°F |
1 to 9 mph
N
|
|
Thursday Night
May 28
|
Slight Chance Rain Showers then Partly Cloudy
|
57°F |
3 to 9 mph
N
|
|
Friday
May 29
|
Mostly Sunny
|
76°F |
2 to 12 mph
N
|
|
Friday Night
May 29
|
Partly Cloudy
|
54°F |
5 to 10 mph
N
|
|
Saturday
May 30
|
Mostly Sunny
|
75°F |
5 to 9 mph
NE
|
|
Saturday Night
May 30
|
Partly Cloudy
|
55°F |
2 to 9 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.
