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.