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.

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Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Washington DC's climate page.

Washington DC Temperature in September

Min Temperature 17°C (63°F)  

Max Temperature 27°C (81°F)  

Chance of Rain 30%  

Precipitation 88 mm (3.5 in)  

Rainy days 9 days  

Humidity 68%  

Windspeed 4 m/s (8 knots)  

Sunshine 225 hours  

Percentage Sunshine 60%  

What to Wear in Washington DC in September

Warm but pleasant conditions in Washington DC in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. Expect heavy rainfall, so bring good rain protection and waterproof bags. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.

What To Do in Washington DC in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

9/10

Cycling

7/10

Walking

7/10

Camping

8/10

Outdoor sports

7/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Washington DC's climate page.

More climate data for Washington DC

Temperature Rainfall Sunshine Humidity Wind Speed

See the full Washington DC climate overview or explore weather in the United States of America.