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

May 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
May is the wettest month of the year at 4" (101.6mm), but also enjoys many sunny days with average temperatures in the range of 55°F (12.8°C) to 75°F (23.9°C).
It is a good idea to bring a light jacket or an umbrella to watch the National Memorial Day Parade. The sunshine increases to more than 6 hours as the daylight extends to 12 hours.
Sunny May is one of the best times to visit Washington, D.C., but it is also one of the busiest, and it is better to plan early to get the best hotels.
  • Average high temperature in May: 75.4°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 May: 56.5°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 May: 64.5%

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

  • Average rainfall in May: 4"

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 May: 11.1 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 May: 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 May: 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 May: 15.3h

The month with the longest days is June (Average daylight: 15.9h).
The month with shortest days is December (Average daylight: 10.5h).

  • Average sunshine in May: 8.4h

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 May: 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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