Chillum Weather in September

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

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

September is in the fall / autumn in Chillum and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a muggy 26°C (79°F), whilst at night 15°C (58°F) is normal.

Chillum weather averages (imperial / metric)
Daytime temperature 26.2°C 79.1°F
Nightly temperature 14.7°C 58.4°F
Average temperature 20.4°C 68.7°F
Daily sunshine 8 hrs
Avg rainfall 89 mm 3.5 ins
Rainy days 7 days
Sea temperature 21.7°C 71.1°F
Humidity 71%
Windspeed 13kph 8 mph

On average September is the 6th wettest month of the year in Chillum with around 89mm 3.5 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 Chillum

Chillum average temperature in September

September rainfall

Chillum average rain in September

September hourly sunshine

Chillum 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 Chillum 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

Chillum weather stats

Chillum weather statistics
Hottest month: July 30.5°C 86.9°F
Driest month: February 71mm 2.8ins
Sunniest month: June 10hrs
Coldest month: January 5°C 41°F
Wettest month: August 113mm 4.4ins
Map showing location of Chillum (38.96372, -76.99081) Chillum map pin © Google

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