National Harbor Weather in July

During July, National Harbor experiences very high daytime temperatures of 32°C (90°F) and cooler nights around 21°C (70°F). Expect quite a bit of rainfall. Around 94 mm (3.7 in) is typical.

Rainfall in National Harbor in July

Historically, approximately 11 days this month are expected to have rain, averaging 94 mm (3.7 in). When it rains this month, it tends to come down fairly heavily. Showers can be substantial even if they don't last all day.

Temperature in National Harbor in July

Daytime temperatures in National Harbor reach 32°C (90°F) in July, dropping to 21°C (70°F) at night. The hottest part of the day is usually in the afternoon, so lighter clothing can help you stay comfortable. Nights remain mild at 21°C (70°F), making evenings a pleasant time to be outdoors. Bear in mind, these are average temperatures, and it can get even warmer on particular days. Make sure to choose clothing that accommodates the warmth.

Sunshine in National Harbor in July

The month enjoys around 279 hours of sunshine, creating mostly sunny days with good weather conditions.

Wind Speed in National Harbor in July

Wind speeds average 4 m/s (8 knots) during July. At this speed, expect moderate winds that can raise dust and move small branches. Since this is an average, some days have gentle light winds while others experience stronger breezes that are quite noticeable.

For National Harbor itself, April generally stands out with 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 National Harbor's climate page.

National Harbor Temperature in July

Min Temperature 21°C (70°F)  

Max Temperature 32°C (90°F)  

Chance of Rain 37%  

Precipitation 94 mm (3.7 in)  

Rainy days 11 days  

Humidity 67% *  

Windspeed 4 m/s (8 knots) *  

Sunshine 279 hours *  

Percentage Sunshine 62% *  

* Data from: Washington DC, the United States of America (7 KM, 4 Miles).

What to Wear in National Harbor in July

Warm temperatures in July make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Prepare for significant rainfall with proper waterproof clothing and shoes. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.

What To Do in National Harbor in July

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 National Harbor's climate page.

More climate data for National Harbor

Temperature Rainfall Sunshine Humidity Wind Speed

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