Ashburn Weather in September

What's the weather like in Ashburn (Virginia) in September 2025?

The climate in Ashburn during September can be summarized as warm and a little damp.

September is in the fall / autumn in Ashburn and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 26°C (79°F), whilst at night 14°C (56°F) is normal.

Ashburn weather averages (imperial / metric)
Daytime temperature 26.4°C 79.4°F
Nightly temperature 13.5°C 56.2°F
Average temperature 19.9°C 67.8°F
Daily sunshine 7.9 hrs
Avg rainfall 89 mm 3.5 ins
Rainy days 8 days
Sea temperature 21.4°C 70.6°F
Humidity 74%
Windspeed 11.5kph 7 mph

On average September is the 5th wettest month of the year in Ashburn with around 89mm 3.5 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 8 days, although this may vary considerably.

On the flip side this corresponds to an average of 7.9 hours of sunshine per day.

September temperatures in Ashburn

Ashburn average temperature in September

September rainfall

Ashburn average rain in September

September hourly sunshine

Ashburn 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 Ashburn in September 2025.

Other monthly averages

Best places to visit in September

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Beta

Current (hourly) weather 15 day forecast

Ashburn weather stats

Ashburn weather statistics
Hottest month: July 30.6°C 87.1°F
Driest month: February 68mm 2.7ins
Sunniest month: June 10hrs
Coldest month: January 4.6°C 40.3°F
Wettest month: May 103mm 4.1ins
Map showing location of Ashburn (39.04372, -77.48749) Ashburn map pin © Google

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