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Washington DC in August

Washington DC Weather in August

🇺🇸 United States

30°C
High
20°C
Low
11
Rain Days
11h
Sunshine
65%
Humidity

North America › 🇺🇸 United States › Washington DC

Updated: March 2026

Is August a Good Time to Visit Washington DC?

5/10
Fair

August is a fair time to visit Washington DC (5/10). With 11 daily sunshine hours and only 11 rain days, this month delivers genuinely reliable outdoor conditions, ranking it 3rd sunniest of the year in Washington DC. Culture-focused travellers and those who prefer lighter crowds will find August a practical choice, with prices running lower than peak June without sacrificing all the good weather. September offers a similar profile at lower hotel rates if dates are flexible. The main practical note: Washington DC's popular sites are busiest between 10am and 3pm regardless of season. Arriving at opening time or after 4pm makes a significant difference to the experience. Planning tips: accommodation is generally available without long lead times, and flight prices are typically lower than peak season. Flexible travellers will find the best deals by booking 2-4 weeks ahead. Mid-week arrivals consistently unlock lower hotel rates than weekend check-ins.

vs July:31°C avg high

Washington DC in August rewards travelers with average highs of 30°C and overnight lows around 20°C. Expect around 11 rainy days, so a compact umbrella is worth carrying. With 11 daily sunshine hours on average, conditions are warm and inviting for outdoor exploration.

30°C

Avg High

20°C

Avg Low

11 days

Rain Days

11h

Sunshine

65%

Humidity

Temperature in Washington DC in August

The 10°C day-night temperature range is typical for continental climates: a light jacket in the morning that you shed by midday and need again after sunset. Humidity averages 65%, which is comfortable for most visitors. On warmer days, lighter fabrics help with the mild stickiness in the afternoon. UV index averages 9 this month, classed as high to very high. SPF 30+ sunscreen, a brim hat, and sunglasses are not optional between 10am and 4pm. Winds are calm at an average 12 km/h, so wind-chill is not a factor in planning your clothing. In Fahrenheit: 86°F average high, 68°F overnight low. Data sourced from Open-Meteo ERA5 climate reanalysis (1991–2020 normals).

Temperature in August

Monthly Precipitation (mm)

What to Wear in Washington DC in August

Morning20°CBefore the day warms up
Afternoon30°CPeak daytime temperature
Evening23°CAfter sunset cools down

Packing for Washington DC in August means dressing for 30°C days and 20°C evenings. A lightweight linen or cotton shirt with loose-fit trousers or a sundress handles the 30°C daytime heat. Evening temperatures settle at 20°C, a modest 10°C drop that a light cardigan or denim jacket covers. For footwear, breathable walking sandals work for casual exploration, but closed-toe trainers are better for uneven surfaces in the historic centre. A compact foldable umbrella weighs almost nothing and earns its keep across 11 potential rainy days.

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Local tip: Layers are more practical than a single heavy garment in Washington DC. The day-to-evening temperature shift rewards packing a versatile mid-layer you can add or remove as conditions change.

Events in Washington DC in August

August has no major festivals or public holidays in Washington DC, which is one of its practical advantages for independent travellers. Attractions run at lower capacity than during peak event periods, queues are shorter, and accommodation is easier to find without needing to book many months in advance. Local restaurants, markets, and transport operate at a relaxed pace, making this an ideal time for visitors who prefer a more authentic, unhurried experience of everyday city life rather than large crowds drawn in by a single major headline event.

What to Pack for Washington DC in August

Based on 30°C average highs and 11 rainy days

  • Light layers for morning and evening
  • Breathable T-shirts and comfortable trousers
  • UV-protective sunglasses
  • Quick-dry travel towel
  • Anti-chafe balm for long walking days
  • Moisture-wicking synthetic fabrics for active days
  • Compact folding umbrella
  • Waterproof outer layer or packable rain jacket
  • Quick-dry clothing that recovers fast after a shower
  • SPF 30+ sunscreen
  • Comfortable walking shoes (a second pair lets the first air out overnight)
  • Universal travel adapter
  • Small day pack for city exploration
  • Reusable water bottle

Best Activities in Washington DC in August

  • Early morning walk through Washington DC's historic market districtBest before 9amTemperatures are still manageable at 26°C before the midday heat builds
  • Open-air rooftop dining at sunsetFrom 6pm onwardsThe 30°C daytime heat drops noticeably after sunset, making al fresco dining comfortable
  • Waterfront promenade or harbour walkEarly morning or after 5pmSea breezes cut through the humidity, making coastal routes the most pleasant in heat
  • Guided cycling tour of the old quarterFirst tour of the day (7-9am)The low-traffic window before tourist crowds and the cooler morning air make this the prime riding slot
  • Afternoon in a world-class museum or galleryAfternoon (2-5pm)Pairs well with outdoor morning activities and provides a mid-day rest from sightseeing
  • Coffee-house or traditional cafe culture experienceMid-morning or post-lunchA cultural ritual in this region that rewards slow appreciation regardless of weather
  • Evening live music, theatre, or opera performanceEvening shows typically at 7-9pmConsistent evening temperatures make getting to and from evening venues comfortable
  • Visit the main botanical garden or city park at seasonal peakYear-round; best light in morningAugust brings distinct seasonal changes to public green spaces worth exploring
  • Seek out chilled local specialities: cold-brew tea, ice desserts, or chilled seafood at street-level stallsAny time; most atmospheric in evening marketsHot-weather street food culture peaks in August, with vendors setting up specifically for warm evenings

Why is Washington DC warm in August?

August in Washington DC reflects a mid-latitude climate pattern, with temperatures averaging 30°C by day and 20°C overnight. The city sits at 39 degrees north latitude, where the balance between solar radiation and heat loss drives conditions that are neither extreme nor static. The warm temperatures reflect a stable high-pressure pattern typical of the season, which suppresses cloud formation and concentrates solar energy at the surface. Day-to-night temperature variation of 10°C is moderate and manageable with a single mid-layer. Climate data: Open-Meteo ERA5 (1991–2020).

Sunshine Hours

The average number of hours per day with direct sunlight. Calculated from satellite measurements. Days with more than 7 hours of sunshine are ideal for outdoor activities. Under 3 hours means overcast conditions dominate.

UV Index

A scale from 0-11+ measuring ultraviolet radiation intensity. UV 0-2: Minimal risk. UV 3-5: Moderate -- wear sunscreen. UV 6-7: High -- hat and SPF 30+ essential. UV 8-10: Very High -- limit midday exposure. UV 11+: Extreme -- seek shade between 10am-4pm.

Rain Days

A rain day is counted when precipitation exceeds 0.1mm. This threshold captures even light drizzle. Unlike total rainfall in mm, rain days tells you how often you might need an umbrella, which is useful for planning outdoor activities.

Humidity

Relative humidity as a percentage. Below 40%: Dry -- skin and throat may feel parched. 40-60%: Comfortable -- ideal for most people. 60-80%: Sticky -- light, breathable fabrics recommended. Above 80%: Muggy -- heat feels more intense; quick-dry clothing is essential.

Frequently Asked Questions: Washington DC in August

In August, Washington DC experiences average highs of 30°C (86°F) and lows of 20°C (68°F). Expect around 11 rainy days and 11 hours of sunshine per day, with humidity averaging 65%. The 10°C gap between daytime and overnight temperatures is worth planning around: light layers work for most visitors during the day, but an overshirt or cardigan handles the cooler evenings. UV index averages 9, so sun protection is advisable on clear days.
Washington DC typically sees 11 rainy days in August, with total precipitation of around 98mm. Rain is moderate and manageable. Showers tend to pass quickly, and a light rain layer or foldable umbrella is sufficient protection for most days. For context, the driest month in Washington DC typically sees 4-6 fewer rain days than August.
Pack lightweight, breathable clothing (linen or cotton), a wide-brim sun hat, SPF 50+ sunscreen, and a refillable water bottle for Washington DC in August. The 30°C daytime heat demands sun protection during midday hours, typically 11am to 4pm. A compact travel umbrella is also worth packing, as 11 rainy days means afternoon showers are a real possibility. Quick-dry synthetic fabrics are preferable to cotton in 65% humidity.
Yes, August is an excellent time to visit Washington DC. With 11 daily sunshine hours and only 11 rainy days, conditions are ideal for sightseeing and outdoor activities. Temperatures averaging 30°C during the day are comfortable for long walks and outdoor dining. This is peak travel season, so booking accommodation in advance and arriving at popular attractions early in the morning helps avoid the busiest periods.
The average high temperature in Washington DC in August is 30°C (86°F), and the average low is 20°C (68°F). The mean daily temperature is approximately 25°C (77°F). The day-to-night range of 10°C is moderate, meaning a single light jacket covers most situations. These are 30-year climate normals based on the 1991 to 2020 reference period; individual years will vary, particularly in transitional months like spring and autumn.
The best month to visit Washington DC is generally August. August offers the most sunshine at 11 hours per day and only 11 rainy days. Average temperatures reach 30°C, making it comfortable for sightseeing, outdoor dining, and exploring the city. If your travel dates are flexible, planning your trip around August gives you the best chance of dry, bright weather.
August is shoulder or low season in Washington DC, meaning fewer tourists and generally lower prices than peak months. With 11 sunshine hours and 11 rainy days, the weather is less of a draw for mass tourism. This is an advantage for travellers who prefer a quieter, more relaxed experience with shorter queues and easier accommodation availability.
In August, Washington DC suits a range of activities thanks to warm temperatures of 30°C. Mix of indoor and outdoor activities works well given the moderate chance of rain. Top options include exploring historic neighbourhoods, visiting museums and galleries, local food markets, and day trips to surrounding areas. With 11 hours of sunshine, parks and waterfront walks are particularly enjoyable.

August ranks 3rd sunniest of the year in Washington DC, with an average 11 daily sunshine hours. The driest months are October, November, and January. July is the hottest month (31°C avg high); January is the coolest (6°C). From here, temperatures fall 4°C into September. Compared to last month (July: 31°C high, 13 rain days), August is cooler and drier. August is among the top three sunniest months to visit Washington DC.

Year-Round Climate

MonthHighLowRain DaysSunDetails
January6°C-2°C96hView
February8°C-1°C97hView
March13°C2°C108hView
April19°C8°C109hView
May24°C13°C1210hView
June29°C18°C1211hView
July31°C21°C1311hView
August30°C20°C1111hView
September26°C17°C109hView
October20°C11°C88hView
November13°C5°C87hView
December8°C0°C96hView

Other Months in Washington DC

JanFebMarAprMayJunJulAugSepOctNovDec

Plan Your Trip to Washington DC

Best Time to Visit Washington DCWashington DC vs New York in August

Data Sources for Washington DC

Washington DC on WikipediaOpen-Meteo Climate APINOAA National CentersUK Met OfficeWMOGeoNames

Climate normals represent 30-year averages (1991-2020). Individual years may vary.