National Harbor weather in September (Maryland, United States of America)

How does the weather in National Harbor usually fare in September? Use this page to get an overview of the month’s weather conditions.

Temperatures

In September, the weather in National Harbor generally includes high temperatures and high rainfall. Anticipate daytime highs near 27°C, and cooler nights with temperatures around 17°C.

Precipitation

National Harbor in September usually receives high rainfall, averaging around 101 mm for the month. Typically, you can expect about 9 days of rain this month.

Average sunshine

The days are predominantly sunny, with an estimated total of around 225 hours of sunshine. These sun-filled days are perfect for spending time outside. Whether it's playing sports, visiting a park, or going for a bike ride.

Should you favor a climate that's both dry and comfortably warm April typically offers the most agreeable circumstances. On the other hand, January, February and December tend to be characterized by conditions that may not be as optimal.

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

 

National Harbor, monthly averages in September

Min Temperature 17°C  

Max Temperature 27°C  

Chance of Rain 29%  

Precipitation 101 mm  

Rainy days 9 days  

Humidity 68% *  

Windspeed 14 km/h *  

Sunshine 225 hours *  

Percentage Sunshine 60% *  

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

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.