Average Rainfall for Pennsylvania in September
The tables below give monthly averages for rainfall during September at cities and other locations in Pennsylvania.
Each place has a total for the amount of precipitation it usually receives this month along with information on the number of days with wet weather. That includes the days when precipitation amounts to 0.01 inches (0.25 millimetres) or more.
The rainfall totals are averages based on weather data collected from 1991 to 2020 for the US National Centers for Environmental Information.
You can jump to a separate table for Eastern and Western Pennsylvania.
Eastern Pennsylvania
| Days | Place | Inches | Millimetres |
|---|---|---|---|
| 10 | Allentown | 4.8 | 123 |
| 9 | Chambersburg | 4.1 | 105 |
| 10 | East Stroudsburg | 5.3 | 135 |
| 11 | George Stevenson Reservoir | 4.3 | 109 |
| 9 | Gettysburg | 4.6 | 118 |
| 10 | Harrisburg | 4.1 | 105 |
| 10 | Lancaster | 4.8 | 122 |
| 10 | Lebanon | 4.6 | 118 |
| 10 | Matamoras | 4.7 | 118 |
| 9 | Norristown | 4.9 | 125 |
| 9 | Philadelphia | 4.4 | 112 |
| 9 | Reading | 4.9 | 124 |
| 11 | State College | 4.0 | 100 |
| 9 | Sunbury | 4.5 | 115 |
| 10 | Towanda | 3.8 | 97 |
| 10 | Wilkes-Barre & Scranton | 4.2 | 105 |
| 10 | Williamsport | 4.8 | 121 |
| 10 | York | 5.1 | 130 |
Western Pennsylvania
| Days | Place | Inches | Millimetres |
|---|---|---|---|
| 10 | Altoona | 4.0 | 101 |
| 11 | Bradford | 4.2 | 106 |
| 11 | Butler | 4.1 | 104 |
| 13 | DuBois | 4.0 | 101 |
| 10 | Erie | 4.3 | 110 |
| 12 | Indiana | 4.2 | 106 |
| 11 | Jamestown | 4.2 | 108 |
| 12 | Meadville | 4.2 | 106 |
| 11 | New Castle | 3.9 | 98 |
| 10 | Pittsburgh | 3.3 | 84 |
| 11 | Uniontown | 3.6 | 90 |
| 12 | Warren | 4.0 | 100 |
| 12 | Youghiogheny River Lake | 4.0 | 101 |
Reference
NOAA National Centers for Environmental Information (NCEI). Climate Normals.