August weather forecast and climate
Washington, DC

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
August is a hot summer month with average daily temperatures ranging in between 70°F (21.1°C) to 86°F (30°C). The skies are mostly sunny and bright, but occasional afternoon thunderstorms bring cloudy and rainy weather.
August is an enjoyable time to visit the vast number of historic sites, gaze at the stunning marble monuments, and visit museums. Washington, D.C. is a busy place, and visitors are spoilt for choice between the various outdoor festivals, parks, botanical gardens, and zoos. Swimming in the sea is a fantastic way to beat the summer.

What is the temperature in August in Washington?

In August, in Washington, the average high-temperature is 86.5°F (30.3°C), and the average low-temperature is 69.6°F (20.9°C).

How many days does it rain in August in Washington?

In Washington, during August, the rain falls for 8.2 days and regularly aggregates up to 2.9" (74.4mm) of precipitation.
Average temperature in August - Washington, DC
  • Average high temperature in August: 86.5°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).

  • Average low temperature in August: 69.7°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).

Average humidity in August - Washington, DC
  • Average humidity in August: 69.3%

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

Average rainfall in August - Washington, DC
  • Average rainfall in August: 2.9"

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

Average rainfall days in August - Washington, DC
  • Average rainfall days in August: 8.2 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).

Average snowfall in August - Washington, DC
  • Average snowfall in August: 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").

Average snowfall days in August - Washington, DC
  • Average snowfall days in August: 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).

Average daylight in August / Average sunshine in August - Washington, DC
  • Average daylight in August: 13.6h

The month with the longest days is June (Average daylight: 14.9h).
The month with shortest days is December (Average daylight: 9.5h).

  • Average sunshine in August: 8.5h

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

Average UV index in August - Washington, DC
  • Average UV index in August: 8

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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