Reston Weather in September

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

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

September is in the fall / autumn in Reston 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.

Reston weather averages (imperial / metric)
Daytime temperature 26.3°C 79.3°F
Nightly temperature 13.6°C 56.4°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 22.1°C 71.7°F
Humidity 74%
Windspeed 11.5kph 7 mph

On average September is the 4th wettest month of the year in Reston 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 Reston

Reston average temperature in September

September rainfall

Reston average rain in September

September hourly sunshine

Reston 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 Reston 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

Reston weather stats

Reston weather statistics
Hottest month: July 30.5°C 86.9°F
Driest month: January 69mm 2.7ins
Sunniest month: June 10hrs
Coldest month: January 4.7°C 40.5°F
Wettest month: August 99mm 3.9ins
Map showing location of Reston (38.96872, -77.3411) Reston map pin © Google

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