District of Columbia, USA
Long term weather forecast
Long term weather forecast

August weather forecast and Climate
Washington, DC

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 hop around 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.
  • Average high temperature in August: 30.3°C

Warmest month (with highest average high temperature) is July (31.3°C).
Month with lowest average high temperature is January (6.3°C).

  • Average low temperature in August: 20.9°C

Month with highest average low temperature is July (21.7°C).
Coldest month (with lowest average low temperature) is January (-1.9°C).

  • Average humidity in August: 69.3%

Month with highest relative humidity is September (69.7%).
Month with lowest relative humidity is April (58%).

  • Average rainfall in August: 74.4mm

Wettest month (with highest rainfall) is May (101.3mm).
Driest month (with lowest rainfall) is February (66.5mm).

  • Average rainfall days in August: 8.2 days

Month with highest number of rainy days is May (11.1 days).
Month with lowest number of rainy days is October (7.7 days).

  • Average snowfall in August: 0mm

Month with highest snowfall is February (144.8mm).
Months with lowest snowfall are April, May, June, July, August, September and October (0mm).

  • Average snowfall days in August: 0 days

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

  • Average daylight in August: 14h

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

  • Average sunshine in August: 8.5h

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

  • Average UV index in August: 8

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