Washington Weather in August

With daytime temperatures of 31°C (88°F) and nighttime lows of 20°C (68°F), August in Washington brings very high temperatures during the day. Do keep in mind that quite a bit of rainfall is typical. Around 82 mm (3.2 in) falls on average.

Rainfall in Washington in August

You can expect rain on roughly 11 days based on historical data, averaging 82 mm (3.2 in) for the month. Rainfall intensity is on the higher side this month. Expect more substantial showers rather than light, passing rain.

Temperature in Washington in August

Temperatures in Washington in August top out at 31°C (88°F) and drop to 20°C (68°F) overnight. The hottest part of the day is usually in the afternoon, so lighter clothing can help you stay comfortable. With lows of 20°C (68°F), the nights are warm and generally comfortable.

Sunshine in Washington in August

Enjoy a sunny month with about 262 hours of sunshine, the clear skies make Washington even more beautiful.

Wind Speed in Washington in August

August 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 prefer dry days with pleasant temperatures, April and September typically offer the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.

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

Washington Temperature in August

Min Temperature 20°C (68°F)  

Max Temperature 31°C (88°F)  

Chance of Rain 37%  

Precipitation 82 mm (3.2 in)  

Rainy days 11 days  

Humidity 69% *  

Windspeed 4 m/s (8 knots) *  

Sunshine 262 hours *  

Percentage Sunshine 62% *  

* Data from: Washington DC, the United States of America (5 KM, 3 Miles).

Daily Historical Temperatures

50-year average (1976-2025)

Based on our historical records, temperatures in Washington typically stay consistent throughout August, with daily highs averaging around 31°C (88°F). Nights are warm, with lows typically ranging from 20°C (68°F) to 22°C (72°F).

Average temperatures in August

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Daily Historical Precipitation

50-year average (1976-2025)

Average daily rainfall for each day of the month based on long-term records.

Average precipitation in August

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Historical weather for Washington in August

Browse day-by-day weather records for Washington spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.

Historical weather Temperatures Precipitation

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Washington historical weather extremes in August

Based on 49 years of weather observations in Washington between 1976 and 2025, these are the recorded extremes.

• The hottest August day on record in Washington reached 39°C (102°F) (August 20, 1983).
• On August 29, 1986, Washington saw its coldest August day with temperatures maxing out at 20°C (68°F).
• The coldest night in August in Washington was on August 30, 1986, with a minimum of 10°C (50°F).

What to Wear in Washington in August

Warm weather calls for comfortable, breathable clothing in August. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). High rain levels are expected, so pack waterproof gear and an umbrella or poncho. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.

What To Do in Washington in August

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's climate page.

More climate data for Washington

Temperature Rainfall Sunshine Humidity Wind Speed

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