Herndon Weather in August

August in Herndon typically sees daytime highs of 30°C (86°F) and nighttime lows of 19°C (66°F). Rainfall is also possible this month, so it's worth packing an umbrella.

Rainfall in Herndon in August

Historically, August sees about 11 days of rain, with a monthly average of 73 mm (2.9 in). Neither particularly heavy nor particularly frequent, the rain this month is about average. A light jacket should be enough on most wet days.

Temperature in Herndon in August

August in Herndon brings typical temperatures with highs around 30°C (86°F) and lows of 19°C (66°F). The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. Nights cool down to 19°C (66°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions.

Sunshine in Herndon in August

Expect a lot of sunshine this month, with about 262 hours of sun. These sunny conditions add to the overall experience.

For Herndon itself, April, May, June, September and October generally stand 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 Herndon's climate page.

Herndon Temperature in August

Min Temperature 19°C (66°F)  

Max Temperature 30°C (86°F)  

Chance of Rain 37%  

Precipitation 73 mm (2.9 in)  

Rainy days 11 days  

Humidity 69% *  

Sunshine 262 hours *  

Percentage Sunshine 62% *  

* Data from: Washington DC, the United States of America (33 KM, 20 Miles).

What to Wear in Herndon 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). Rain is likely on several days, so bring a good rain jacket. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.

What To Do in Herndon 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 Herndon's climate page.

More climate data for Herndon

Temperature Rainfall Sunshine Humidity

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