Average Rainfall for Maryland in September
The tables below give monthly averages for rainfall during September at cities, communities and other locations around Maryland.
Each place has a total for the amount of precipitation it usually receives this month. There is also a count of the number of days with wet weather, 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 each region of the state: Eastern Shore, Central Maryland and Western Maryland.
Eastern Shore
| Days | Place | Inches | Millimetres |
|---|---|---|---|
| 8 | Assateague Island | 4.5 | 114 |
| 8 | Chestertown | 4.9 | 124 |
| 10 | Ocean City | 3.9 | 100 |
| 8 | Royal Oak | 4.2 | 106 |
| 8 | Salisbury | 4.3 | 110 |
| 8 | Snow Hill | 5.3 | 134 |
Central Maryland
| Days | Place | Inches | Millimetres |
|---|---|---|---|
| 9 | Baltimore | 4.4 | 113 |
| 9 | Beltsville | 4.4 | 112 |
| 12 | Catoctin Mountain Park | 5.3 | 135 |
| 10 | Frederick | 5.8 | 147 |
| 9 | Laurel | 4.7 | 119 |
| 9 | Mechanicsville | 4.9 | 124 |
| 9 | Patuxent River | 4.2 | 105 |
| 10 | Rockville | 4.0 | 102 |
Western Maryland
| Days | Place | Inches | Millimetres |
|---|---|---|---|
| 10 | Cumberland | 3.6 | 90 |
| 11 | Frostburg | 4.2 | 107 |
| 10 | Hagerstown | 3.8 | 97 |
| 12 | Oakland | 3.7 | 94 |
| 9 | Savage River Reservoir Dam | 3.8 | 95 |
Reference
NOAA National Centers for Environmental Information (NCEI). Climate Normals.