Baltimore, Maryland weather in September

Averages from 2021–2025 (150 days of record).

Average high: 78°F
Average low: 62°F
Rainy days: ~11 per month
Total precipitation: 5.2 in
Warmest recorded: 100°F
Coldest recorded: 49°F

Expect September days in Baltimore, Maryland to top out around 78°F and cool to about 62°F overnight, with roughly 11 days of measurable rain across the month. In recent years September has ranged from 49°F to 100°F.

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Current Baltimore, Maryland forecast → · Historical data by Open-Meteo (ERA5).