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

Average monthly precipitation in September
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

September averages for total rainfall
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

Average amount of rain in September
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.

Maryland Precipitation
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