United States, North America

Washington, DC in September

Schools back in session, humidity breaking, crowds gone. Arguably the smartest month of the year here.

BestWarm days fading to crisp, highs near 81F (27C)

Washington Monument over the Lincoln Memorial Reflecting Pool — Washington, DCPhoto: G. Edward Johnson, CC BY 4.0

The straight answer

September is one of the best months of the year to visit Washington, DC. Schools back in session, humidity breaking, crowds gone. Arguably the smartest month of the year here.

Weather: Warm days fading to crisp, highs near 81F (27C)
Crowds: 2 of 5
Prices: 3 of 5

What September is like in Washington, DC

September may be the smartest month of the year in DC. Highs start near 81F (27C) and fade to crisp by month's end. Schools are back in session, humidity breaks, and summer crowds are gone. Museums are calm on weekdays and hotels are reasonably priced. Everything is open, and early evenings are perfect for a slow loop past the memorials. You can often walk right into the museums that need timed passes in spring.

It suits homeschool families, couples, and anyone who wants comfortable walking with no lines. There is little reason to pick another month. If you want fall color too, wait for late October.

Make the most of September

What is especially good about Washington, DC this month.

Empty museums on weekdays

With school trips not yet in full swing, Air and Space and Natural History are easy to explore.

Comfortable monument walks

Cooler evenings make the long loop around the Mall pleasant again.

Capitol tours without the crowd

Tours are easier to book after the summer rush. Request yours through the visitor center or your representative.

What to pack for September

Light layers for warm days and cool nights
Comfortable walking shoes
Sunglasses and sunscreen
A light rain jacket

Our timing tip

Book a Capitol tour a few weeks ahead, and plan it for a weekday morning when the building is quietest.

Book Washington, DC for September.

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Hotels. Expedia
Hotels in Washington, DC
Opens a hotel search for Washington, DC in September, dates filled in. Book early for the best months: the good rooms go first.
Hotels for September
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Vacation rentals in Washington, DC
Whole homes, condos and villas. Usually the better deal for families and groups, with a kitchen and room to spread out.
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Tours and tickets. Expedia
Tours and tickets in Washington, DC
Timed-entry tickets, day trips and guided tours in Washington, DC for September. Popular slots sell out in the best months.
Tours and tickets

Things to do in Washington, DC

Full guide

The National Mall monuments

Do Lincoln, the Vietnam Wall, and the Korean Memorial at sunrise or after dark. Distances are longer than they look; the loop is several miles on foot.

Official site ↗Tickets and tours →

Smithsonian Air and Space and Natural History

The two biggest kid magnets. Free timed passes are required at some Smithsonian museums in busy season; check before you go.

Official site ↗Tickets and tours →

Tidal Basin and the cherry trees

In bloom week, go at sunrise. By 10am it is shoulder to shoulder. Off season it is a lovely, quiet waterside walk.

Tickets and tours →

National Gallery of Art

A world-class collection, free, and usually calmer than the Smithsonian giants. The sculpture garden fountain becomes an ice rink in winter.

Official site ↗Tickets and tours →

The Capitol and Library of Congress

Book Capitol tours ahead through your representative or the visitor center. The Library's Great Hall is the most beautiful room in the city.

Official site ↗Tickets and tours →

Arlington National Cemetery

The Changing of the Guard at the Tomb of the Unknown Soldier runs year-round. Give it a half day and wear walking shoes; the grounds are hilly.

Official site ↗Tickets and tours →

Beat the crowds

For blossoms without the crush, hit the Tidal Basin at sunrise, or see the same trees with a fraction of the people at the National Arboretum and around East Potomac Park.
School groups dominate weekday mornings from March through early June. Flip your day: monuments and neighborhoods in the morning, museums after 2pm when the buses leave.
September and October give you April's weather with a third of April's people. If bloom is not the point, this is the trade to make.
Do the monuments after dark. They are lit, open 24 hours, cooler in summer, and the tour-bus waves are gone by 9pm.

Know before you go

DC is a genuine year-round city. The Smithsonian museums and the National Gallery are open nearly every day of the year, typically closing only December 25.
The outdoor monuments and memorials never close: they are open 24 hours a day, every day, with rangers on duty at the major sites during the day and evening.
Peak bloom is not schedulable. The trees peak for roughly a week, sometime between late March and mid April depending on the year, and a warm or cold snap can move it. Book refundable rooms if bloom is the whole mission.
A federal government shutdown, when one happens, can shutter the Smithsonian museums, the Archives, and National Park Service sites. It is rare but worth a news check before a big trip.

Washington, DC in September, quick answers

Is September a good time to visit Washington, DC?

September is one of the best months of the year to visit Washington, DC. Schools back in session, humidity breaking, crowds gone. Arguably the smartest month of the year here.

What is the weather like in Washington, DC in September?

Warm days fading to crisp, highs near 81F (27C).

Is Washington, DC crowded in September?

September is one of the quieter months in Washington, DC; most sights can be done without long waits.