September weather forecast
Maryland, USA

September in Maryland marks the beginning of autumn and a notable transition from the hot, humid summer months. The oppressive heat starts to recede, and temperatures range between 65°F (18.3°C) and 80°F (26.7°C), though occasional warmer days are not uncommon.

The eastern regions near the ocean continue to experience some lingering humidity, while the western parts of the state welcome a more temperate and comfortable climate. The humid subtropical climate of the east gives way to milder oceanic and humid continental conditions in the west.

Rainfall becomes more evenly distributed, and the arrival of cold fronts may lead to sudden weather changes. The Allegheny Plateau, known for its heavier precipitation, continues to influence Maryland's overall climate.

September's weather encourages outdoor exploration and activities, with the cooler temperatures providing a comfortable environment for hiking, sightseeing, and enjoying the state's natural beauty. The changing leaves begin to add color to the landscape, especially in the forested mountains of western Maryland.

Compared to the peak heat of July and August, September's weather offers a pleasant contrast and introduces the refreshing characteristics of autumn. The transition from summer to fall is gradual, allowing residents and tourists to savor the warmth while enjoying the emerging coolness.

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• Baltimore - September »
  In Baltimore in September, the average water temperature is 73.6°F (23.1°C). A subtle shift in Baltimore's weather is observed as August turns into September, with the average high temperature reducing from 83.5°F (28.6°C) to a still moderately hot 77°F (25°C).
• Frederick - September »
  September marks the beginning of the fall season in Frederick when the leaves start to change color and daylight begins to shorten. In Frederick, in September, it is raining for 13.4 days, with typically 2.05" (52mm) of accumulated precipitation.
• Rockville - September »
  A subtle shift in Rockville's weather is observed as August turns into September, with the average high temperature reducing from 85.3°F (29.6°C) to a still moderately hot 77.9°F (25.5°C). In Rockville, during September, the rain falls for 13.7 days and regularly aggregates up to 2.2" (56mm) of precipitation.
• Gaithersburg - September »
  Gaithersburg's September weather represents the gateway to fall, with temperatures declining from the peak summer highs to a range from 59.9°F (15.5°C) to 77.7°F (25.4°C). As September arrives, Gaithersburg's weather displays a minor decrease in high-temperatures, transitioning from August's moderately hot 84.6°F (29.2°C) to a still warm 77.7°F (25.4°C).
• Bowie - September »
  In Bowie in September, during 12.6 rainfall days, 2.13" (54mm) of precipitation is typically accumulated. In Bowie, in September, it is raining for 12.6 days, with typically 2.13" (54mm) of accumulated precipitation.
• Hagerstown - September »
  In Hagerstown, in September, it is raining for 14.2 days, with typically 2.09" (53mm) of accumulated precipitation. On the last day of September, in Hagerstown, sunrise is at 7:06 am and sunset at 6:54 pm EDT.
• Annapolis - September »
  In Annapolis in September, during 10.5 rainfall days, 0.63" (16mm) of precipitation is typically accumulated. In Annapolis, Maryland, in September, the average water temperature is 73.9°F (23.3°C).
• College Park - September »
  The month with the least rainfall in College Park, Maryland, is September, when the rain falls for 11.9 days and typically collects 1.93" (49mm) of precipitation. The month with the least rainfall in College Park is September, when the rain falls for 11.9 days and typically collects 1.93" (49mm) of precipitation.
• Salisbury - September »
  In September, in Salisbury the rain falls for 13.5 days. On the first day of September in Salisbury, sunrise is at 6:32 am and sunset at 7:31 pm.
• Laurel - September »
  In September, in Laurel the rain falls for 13.4 days. A minor decrease in the average high-temperature is observed in Laurel, Maryland, during September, shifting from 84°F (28.9°C) in August to a still warm 77.5°F (25.3°C).
• Greenbelt - September »
  With the arrival of September, Greenbelt notices a mild change in the average high-temperature, sliding from August's warm 85.1°F (29.5°C) to a still moderately hot 78.1°F (25.6°C). In Greenbelt, during September, the rain falls for 12.3 days and regularly aggregates up to 2.09" (53mm) of precipitation.
• Cumberland - September »
  On the last day of September, in Cumberland sunrise is at 7:10 am and sunset at 6:58 pm EDT. On the first day of September in Cumberland, sunrise is at 6:43 am and sunset at 7:45 pm.