Baltimore Weather in September

What's the weather like in Baltimore (Maryland) in September 2025?

The climate in Baltimore during September can be summarized as warm, humid and a little damp.

September is in the fall / autumn in Baltimore and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a muggy 26°C (79°F), whilst at night 17°C (62°F) is normal.

Baltimore weather averages (imperial / metric)
Daytime temperature 26.4°C 79.4°F
Nightly temperature 16.5°C 61.6°F
Average temperature 21.4°C 70.5°F
Daily sunshine 8 hrs
Avg rainfall 91 mm 3.6 ins
Rainy days 7 days
Sea temperature 21.1°C 70°F
Humidity 72%
Windspeed 13kph 8 mph

On average September is the 6th wettest month of the year in Baltimore with around 91mm 3.6 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 7 days, although this may vary considerably.

On the flip side this corresponds to an average of 8 hours of sunshine per day.

September temperatures in Baltimore

Baltimore average temperature in September

September rainfall

Baltimore average rain in September

September hourly sunshine

Baltimore average rain in September

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Baltimore in September 2025.

Other monthly averages

Best places to visit in September

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Baltimore weather stats

Baltimore weather statistics
Hottest month: July 30.9°C 87.6°F
Driest month: October 76mm 3ins
Sunniest month: July 10hrs
Coldest month: January 4.8°C 40.6°F
Wettest month: August 105mm 4.1ins
Map showing location of Baltimore (39.29038, -76.61219) Baltimore map pin © Google

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