Pennsylvania weather in September: Statewide normals and every place, NOAA 1991-2020
In September, Pennsylvania's statewide normal high is 74°F and normal low 52°F; normal highs run from 68°F in Laporte to 80°F in Marcus Hook (NOAA 1991-2020 normals).
- Statewide normal high
- 74°FSeptember, 1991-2020
- Statewide normal low
- 52°FSeptember, 1991-2020
- Statewide normal precipitation
- 4.30 inSeptember
- Warmest place
- 80°Fnormal high, Marcus Hook
- Coolest place
- 68°Fnormal high, Laporte
Where is Pennsylvania warmest and wettest in September?
Marcus Hook has the warmest September afternoons (80°F) and Laporte the coolest (68°F). West Chester gets the most precipitation (5.65 in) and Emsworth the least (3.19 in).
Statewide, September averaged 64.3°F in 2021, 63.0°F in 2022, 63.6°F in 2023, 64.0°F in 2024, 64.2°F in 2025, against a 1991-2020 normal of 62.8°F.
| Place | High | Low | Precip. | Snow |
|---|---|---|---|---|
| Philadelphia | 79°F | 61°F | 4.40 | 0.0 |
| Pittsburgh | 75°F | 55°F | 3.30 | 0.0 |
| Allentown | 77°F | 55°F | 4.84 | 0.0 |
| Reading | 77°F | 57°F | 4.88 | – |
| Erie | 74°F | 57°F | 4.32 | 0.0 |
| Lancaster | 78°F | 56°F | 4.69 | – |
| Harrisburg | 79°F | 58°F | 4.12 | – |
| York | 77°F | 54°F | 4.80 | – |
| Altoona | 74°F | 53°F | 3.96 | – |
| State College | 72°F | 54°F | 3.95 | 0.0 |
| Norristown | 80°F | 58°F | 4.91 | 0.0 |
| Williamsport | 75°F | 54°F | 4.76 | 0.0 |
| Lebanon | 76°F | 55°F | 4.63 | 0.0 |
| Pottstown | 75°F | 55°F | 4.83 | – |
| Chambersburg | 76°F | 56°F | 4.14 | 0.0 |
| West Chester | 78°F | 54°F | 5.65 | 0.0 |
| Carlisle | 77°F | 53°F | 4.96 | 0.0 |
| New Castle | 79°F | 52°F | 3.86 | 0.0 |
| Murrysville | 77°F | 55°F | 3.44 | 0.0 |
| Phoenixville | 79°F | 56°F | 4.43 | – |
| West Mifflin | 75°F | 56°F | 3.54 | – |
| Johnstown | 71°F | 53°F | 3.99 | – |
| McKeesport | 77°F | 53°F | 3.45 | – |
| Hanover | 77°F | 54°F | 4.83 | 0.0 |
| Indiana | 75°F | 51°F | 4.18 | 0.0 |
| Willow Grove | 76°F | 58°F | – | – |
| Carnot-Moon | 76°F | 53°F | 3.81 | – |
| Coatesville | 77°F | 56°F | 5.17 | 0.0 |
| Washington | 76°F | 54°F | 3.57 | 0.0 |
| Butler | 74°F | 50°F | 4.09 | 0.0 |
| Middletown | 78°F | 58°F | 4.83 | 0.0 |
| Uniontown | 78°F | 53°F | 3.55 | 0.0 |
| Sunbury | 75°F | 51°F | 4.52 | 0.0 |
| East Stroudsburg | 75°F | 52°F | 5.30 | 0.0 |
| Warren | 74°F | 52°F | 3.95 | 0.0 |
| Beaver Falls | 76°F | 53°F | 3.62 | – |
| Lock Haven | 76°F | 53°F | 4.25 | 0.0 |
| Lewistown | 77°F | 54°F | 4.40 | 0.0 |
| Doylestown | 77°F | 57°F | 4.35 | – |
| Bradford | 70°F | 48°F | 3.65 | – |
| DuBois | 71°F | 51°F | 3.96 | – |
| Connellsville | 77°F | 54°F | 3.92 | 0.0 |
| Franklin | 74°F | 52°F | 3.94 | 0.0 |
| New Holland | 77°F | 58°F | 4.90 | 0.0 |
| Clearfield | 73°F | 50°F | 3.81 | – |
| Shippensburg | 78°F | 55°F | 4.32 | 0.0 |
| Selinsgrove | 76°F | 52°F | 4.51 | – |
| Lehighton | 73°F | 53°F | 5.60 | 0.0 |
| Lewisburg | 75°F | 52°F | 4.41 | 0.0 |
| Titusville | 73°F | 49°F | 4.06 | 0.0 |
| Hamburg | 76°F | 55°F | 5.09 | 0.0 |
| Sellersville | 77°F | 54°F | 4.91 | 0.0 |
| Donora | 78°F | 54°F | 3.55 | 0.0 |
| Charleroi | 78°F | 56°F | 3.26 | 0.0 |
| Mount Pleasant | 75°F | 51°F | 3.49 | 0.0 |
| Clarion | 74°F | 50°F | 4.00 | – |
| Ridgway | 74°F | 49°F | 4.03 | 0.0 |
| Waynesburg | 77°F | 51°F | 3.51 | 0.0 |
| Slippery Rock | 74°F | 50°F | 4.07 | – |
| Mahanoy City | 72°F | 52°F | 5.24 | 0.0 |
| Kane | 71°F | 45°F | 3.91 | 0.0 |
| Loyalhanna | 76°F | 51°F | 4.00 | – |
| Wellsboro | 70°F | 48°F | 4.17 | 0.0 |
| Ebensburg | 71°F | 48°F | 4.21 | 0.0 |
| Mount Pocono | 69°F | 50°F | 5.59 | – |
| Union City | 73°F | 49°F | 4.36 | 0.0 |
| Towanda | 75°F | 51°F | 3.83 | 0.0 |
| Ford City | 76°F | 51°F | 4.22 | – |
| Philipsburg | 72°F | 48°F | 4.07 | 0.0 |
| Avoca | 75°F | 54°F | 4.15 | 0.0 |
| Landisville | 76°F | 52°F | 4.68 | 0.0 |
| Marcus Hook | 80°F | 61°F | 4.36 | – |
| Matamoras | 74°F | 51°F | 4.66 | 0.0 |
| Emsworth | 78°F | 55°F | 3.19 | – |
| Coudersport | 71°F | 47°F | 4.15 | 0.0 |
| Port Allegany | 71°F | 48°F | 3.69 | 0.0 |
| Meyersdale | 73°F | 48°F | 3.62 | 0.0 |
| Mercer | 75°F | 49°F | – | – |
| Emporium | 74°F | 51°F | 4.15 | 0.0 |
| Everett | 77°F | 52°F | 3.98 | 0.0 |
| Canton | 72°F | 48°F | 4.34 | 0.0 |
| Braddock | 77°F | 56°F | 3.32 | – |
| Avondale | 75°F | 55°F | 4.47 | – |
| Montrose | 71°F | 47°F | 4.53 | 0.0 |
| Biglerville | 77°F | 56°F | 5.24 | 0.0 |
| Hawley | 73°F | 48°F | 4.26 | 0.0 |
| Point Marion | 77°F | 54°F | 3.63 | – |
| Renovo | 75°F | 52°F | 4.30 | 0.0 |
| Linesville | 73°F | 53°F | 4.10 | 0.0 |
| Glenmoore | 76°F | 55°F | 4.86 | 0.0 |
| Millheim | 74°F | 49°F | 4.40 | 0.0 |
| Benton | 72°F | 50°F | 4.89 | 0.0 |
| Natrona | 76°F | 55°F | 3.99 | – |
| Clarence | 74°F | 44°F | 4.45 | 0.0 |
| Confluence | 76°F | 52°F | 3.97 | 0.0 |
| Tioga | 73°F | 50°F | 3.72 | 0.0 |
| Jamestown | 74°F | 51°F | 4.24 | 0.0 |
| Dushore | 71°F | 47°F | 4.13 | 0.0 |
| Tionesta | 75°F | 53°F | 4.03 | 0.0 |
| Laurelton | 76°F | 54°F | – | – |
| Springboro | 73°F | 50°F | 4.59 | 0.0 |
| Grampian | 72°F | 49°F | 3.94 | 0.0 |
| Laporte | 68°F | 49°F | 5.25 | 0.0 |
| Cashtown | 77°F | 53°F | 4.90 | – |
| Laurel Mountain | 72°F | 52°F | 4.43 | – |
| Oswayo | 71°F | 45°F | 4.28 | 0.0 |
| Donegal | 74°F | 52°F | 3.87 | – |
| Schenley | 78°F | 54°F | 4.00 | – |
| Acmetonia Lock 3 | 76°F | 54°F | 4.18 | – |
| Alvin R Bush Dam | 74°F | 52°F | – | – |
| Bear Gap | 74°F | 53°F | 5.20 | 0.0 |
| Bloserville (1 mi N) | 75°F | 55°F | 4.50 | – |
| Blue Marsh Lake | 77°F | 54°F | 5.01 | – |
| Bucksville | 76°F | 54°F | 4.60 | – |
| Chalk Hill (2 mi ENE) | 71°F | 47°F | 4.70 | 0.0 |
| Chandlers Valley (1 mi SE) | 73°F | 46°F | 4.22 | 0.0 |
| Clermont (1 mi NW) | 67°F | 47°F | 4.41 | 0.0 |
| Cooksburg (2 mi NW) | 72°F | 47°F | 4.21 | – |
| Cowanesque Dam | 73°F | 50°F | 3.99 | 0.0 |
| Dehart Dam | 75°F | 52°F | 5.63 | 0.0 |
| Eisenhower National Historic Site | 78°F | 54°F | 4.63 | – |
| Francis E Walter Dam | 71°F | 49°F | 5.24 | – |
| Glen Hazel 2 NE Dam | 71°F | 48°F | 3.95 | 0.0 |
| Glenwillard Dashields Lock and Dam | 76°F | 56°F | 3.45 | 0.0 |
| Graterford (1 mi E) | 78°F | 53°F | 4.90 | 0.0 |
| Grays Landing | 77°F | 54°F | 3.44 | 0.0 |
| Hidden Valley | 70°F | 52°F | 4.31 | – |
| Hopewell Morgantown | 76°F | 55°F | – | – |
| Laurel Summit | 68°F | 51°F | 4.81 | 0.0 |
| Milanville | 74°F | 49°F | 4.65 | – |
| Montgomery Lock and Dam | 75°F | 54°F | 4.14 | – |
| Neshaminy Falls | 77°F | 56°F | 4.72 | 0.0 |
| Octoraro Lake | 76°F | 56°F | 5.17 | 0.0 |
| Phila Franklin Inst | 80°F | 63°F | 4.88 | 0.0 |
| Philadelphia NE Airport | 79°F | 60°F | 4.52 | – |
| Pleasant Mount (1 mi W) | 69°F | 47°F | 4.98 | 0.0 |
| Port Meadville Airport | 72°F | 53°F | 4.16 | – |
| Prince Gallitzin State Park | 74°F | 49°F | 4.05 | 0.0 |
| Putneyville 2 SE Dam | 74°F | 50°F | 4.09 | 0.0 |
| Raystown Headquarters | 76°F | 55°F | 4.13 | – |
| Raystown Lake 2 | 76°F | 55°F | 3.87 | – |
| Rector (3 mi SSW) | 77°F | 49°F | 3.70 | – |
| Rodale Research Center | 77°F | 53°F | 4.78 | – |
| Safe Harbor Dam | 77°F | 60°F | 4.88 | 0.0 |
| Salina (3 mi W) | 76°F | 53°F | 3.97 | 0.0 |
| Shawnee State Park | 75°F | 50°F | 3.74 | – |
| South Mountain | 73°F | 53°F | 5.07 | 0.0 |
| Springtown (1 mi NNE) | 75°F | 54°F | 5.06 | 0.0 |
| Stevenson Dam | 73°F | 50°F | 4.28 | 0.0 |
| Wolfsburg | 77°F | 50°F | 3.81 | 0.0 |
| York 3 SSW Pump Station | 80°F | 55°F | 5.10 | 0.0 |
Source: NOAA NCEI nClimDiv statewide normals; NOAA NCEI 1991-2020 monthly normals for each station.