Herndon weather in September (Virginia, United States of America)

Is Herndon a good destination in September, weather-wise? Here’s a detailed forecast of the month’s weather patterns.

Temperatures

In September, Herndon typically experiences high temperatures and high rainfall. During the daylight hours, temperatures often reach 26°C. After dark they usually decrease to around 15°C.

Precipitation

Herndon in September usually receives high rainfall, averaging around 102 mm for the month. On average, there are about 10 days with rain during this month.

Average sunshine

With approximately 225 hours hours of sun, the days are filled with brightness. It makes it a perfect month for outdoor activities.

If you're a fan of comfortable temperatures and drier conditions, September is a great time to visit. April, May, June, July, August, September and October generally stand out with the best circumstances. While January, February and December tend to showcase less optimal conditions.

For an in-depth look at the yearly conditions, visit our specialized Herndon climate page with graphs.

 

Herndon, monthly averages in September

Min Temperature 15°C  

Max Temperature 26°C  

Chance of Rain 33%  

Precipitation 102 mm  

Rainy days 10 days  

Humidity 68% *  

Sunshine 225 hours *  

Percentage Sunshine 60% *  

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

Where to go in the United States of America in September

Find out more about the weather in the United States of America and which places have the best travel conditions in this month.

Weather conditions Weather

Temperatures

Precipitation

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Legend perfect weather pleasant tolerable unpleasant poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C and 29°C and not too much precipitation (less than 90 mm a month).

So, what should you wear in this month?

It's going to be warm! Consider airy clothing, t-shirts, and other summer clothes. Shorts for men made of cotton or linen are good options for staying cool. However, there's a good chance of rain, so bring a raincoat just in case.

What To Do

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

9/10

Cycling

7/10

Walking

7/10

Camping

6/10

Outdoor sports

7/10

Interested in more climate information?

This site provides you with all the information you need about the climate in Herndon.

Our site offers climate and forecast data for every country in the world. Are you going to the United States of America? On this website you can find historical weather averages for many cities in the United States of America. Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.