Washington DC Weather in September

Washington DC in September sees high temperatures, with highs around 27°C (81°F) and overnight lows of 17°C (63°F). Rainfall is fairly high at around 88 mm (3.5 in) on average, so pack waterproofs just in case.

Rainfall in Washington DC in September

Historically, September sees about 9 days of rain, with a monthly average of 88 mm (3.5 in). Rainfall intensity is on the higher side this month. Expect more substantial showers rather than light, passing rain.

Temperature in Washington DC in September

Washington DC has excellent weather in September, with days reaching 27°C (81°F) and nights cooling to 17°C (63°F). Conditions stay fairly consistent through the month, making it easier to plan what to wear. At 17°C (63°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping.

Sunshine in Washington DC in September

With approximately 225 hours of sunshine, the days are filled with clear skies. It makes it a perfect month for being outside.

Wind Speed in Washington DC in September

September sees wind speeds averaging 4 m/s (8 knots). You'll experience variable conditions with moderate winds that create small waves on water and keep branches moving. Conditions range from light winds to moderate breezes throughout the month.

If you favor pleasant temperatures and minimal rainfall, September is one of the best months to visit Washington DC.