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

May weather forecast and Climate
Washington, DC

  • Average high temperature in May: 75.4°F

Warmest month (with highest average high temperature) is July (88.4°F).
Month with lowest average high temperature is January (43.4°F).

  • Average low temperature in May: 56.5°F

Month with highest average low temperature is July (71.1°F).
Coldest month (with lowest average low temperature) is January (28.6°F).

  • Average humidity in May: 64.5%

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

  • Average rainfall in May: 4"

Wettest month (with highest rainfall) is May (4").
Driest month (with lowest rainfall) is February (2.6").

  • Average rainfall days in May: 11.1 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 May: 0"

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

  • Average snowfall days in May: 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 May: 14h

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

  • Average sunshine in May: 8.4h

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

  • Average UV index in May: 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).