Washington
District of Columbia, USA
Long-term weather forecast
Long-term weather forecast
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September weather forecast and Climate
Washington, DC

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Stunning reflective view of rows of jacaranda trees in spring in the tidal basin of the Washington monument in DC, USA
Stunning reflective view of rows of jacaranda trees in spring in the tidal basin of the Washington monument in DC, USA
Fall weather brings the average daily temperatures in the range of a comfortable 63°F (17.2°C) to 79°F (26.1°C).
September is one of the best intervals to visit Washington, D.C. with fewer crowds compared to spring and summer due to the end of the school breaks. There are fewer lines to stand in, and more time to enjoy the tours in the lovely autumn. Be sure to pack some warm clothes to protect from an odd cold bout or two. The Library of Congress National Book Festival during September is also an entertaining way to pass rainy fall afternoons.
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  • The average high temperature in September: 79.5°F

The warmest month (with the highest average high temperature) is July (88.4°F).
The month with the lowest average high temperature is January (43.4°F).

  • The average low temperature in September: 62.4°F

The month with the highest average low temperature is July (71.1°F).
The coldest month (with the lowest average low temperature) is January (28.6°F).

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  • The average humidity in September: 69.7%

The month with the highest relative humidity is September (69.7%).
The month with the lowest relative humidity is April (58%).

  • The average rainfall in September: 3.7"

The wettest month (with the highest rainfall) is May (4").
The driest month (with the lowest rainfall) is February (2.6").

  • The average rainfall days in September: 8.3 days

The month with the highest number of rainy days is May (11.1 days).
The month with the lowest number of rainy days is October (7.7 days).

  • The average snowfall in September: 0"

The month with the highest snowfall is February (5.7").
Months with the lowest snowfall are April, May, June, July, August, September and October (0").

  • The average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (3 days).
Months with the lowest number of snowfall days are May, June, July, August, September and October (0 days).

  • The average daylight in September: 12h

Months with the longest days are June and July (Average daylight: 15h).
The month with shortest days is December (Average daylight: 9h).

  • The average sunshine in September: 7.5h

The month with most sunshine is June (Average sunshine: 9.4h).
The month with least sunshine is December (Average sunshine: 4.3h).

  • The average UV index in September: 7

Months with the highest UV index are June and July (UV index 9).
Months with the lowest UV index are January and December (UV index 2).

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