May weather forecast and climate
Washington, DC

Rows of jacaranda trees in spring in the tidal basin of the Washington Monument in Washington city, DC, USA
Rows of jacaranda trees in spring in the tidal basin of the Washington Monument in Washington city, DC, USA
The last month of the spring, May, is a moderately hot month in Washington, District of Columbia, with temperature in the range of an average high of 74.5°F (23.6°C) and an average low of 57°F (13.9°C).

Temperature

In May, the average high-temperature rises, from a comfortable 65.1°F (18.4°C) in April, to a warm 74.5°F (23.6°C). The average low-temperature, in Washington, District of Columbia, is 57°F (13.9°C).

Humidity

May is the most humid month in Washington, District of Columbia, with an average relative humidity of 76%.

Rainfall

In Washington, District of Columbia, during 16.3 rainfall days, 2.64" (67mm) of precipitation is typically accumulated. Throughout the year, in Washington, District of Columbia, there are 149.1 rainfall days, and 26.14" (664mm) of precipitation is accumulated.

Snowfall

In Washington snow does not fall in April through November.

Daylight

In Washington, the average length of the day is 14.3h.

Sunshine

The average sunshine in Washington is 8.9h.

UV index

In May, the average daily maximum UV index in Washington is 6. A UV Index estimate of 6 to 7 represents a high health hazard from the exposure to the Sun's UV rays for average individuals.
Note: The average daily UV index of 6 in May transform into the following instructions:
Take precautions against overexposure. Protection against sun damage is needed. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.

What is the temperature in May in Washington?

In Washington, in May, the average high-temperature is 74.5°F (23.6°C), and the average low-temperature is 57°F (13.9°C).

What is the most humid month in Washington?

May is the most humid month in Washington, with an average relative humidity of 76%.

What is the average humidity in May in Washington?

The average relative humidity in May is 76%.

How much does it rain in Washington in May?

In May, in Washington, the rain falls for 16.3 days. Throughout May, 2.64" (67mm) of precipitation is accumulated.

When it does not snow in Washington?

In Washington snow does not fall in April through November.

How many hours of daylight does Washington have in May?

In Washington, the average length of the day in May is 14.3h.

How many hours of sunshine does Washington have in May?

In May, the average sunshine is 8.9h.

What is the UV index reading in May in Washington?

In Washington, District of Columbia, the average daily maximum UV index in May is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from the exposure to the Sun's UV radiation.
Average temperature in May - Washington, DC
  • Average high temperature in May: 74.5°F

The warmest month (with the highest average high temperature) is July (88°F).
The month with the lowest average high temperature is January (40.6°F).

  • Average low temperature in May: 57°F

The month with the highest average low temperature is July (69.1°F).
The coldest month (with the lowest average low temperature) is January (27.5°F).

Average pressure in May - Washington, DC
  • Average pressure in May: 30.01"

The month with the highest atmospheric pressure is November (30.14").
The month with the lowest atmospheric pressure is June (29.95").

Average wind speed in May - Washington, DC
  • Average wind speed in May: 6.5mph

The windiest month (with the highest average wind speed) is March (7.9mph).
The calmest month (with the lowest average wind speed) is August (5mph).

Average humidity in May - Washington, DC
  • Average humidity in May: 76%

The month with the highest relative humidity is May (76%).
Months with the lowest relative humidity are April and July (71%).

Average rainfall in May - Washington, DC
  • Average rainfall in May: 2.64"

The wettest month (with the highest rainfall) is August (3.46").
The driest month (with the least rainfall) is January (1.57").

Average rainfall days in May - Washington, DC
  • Average rainfall days in May: 16.3 days

The month with the highest number of rainy days is July (16.4 days).
The month with the least rainy days is November (8.1 days).

Average snowfall in May - Washington, DC
  • Average snowfall in May: 0"

The month with the highest snowfall is January (2.17").
Months with the least snowfall are April, May, June, July, August, September, October and November (0").

Average snowfall days in May - Washington, DC
  • Average snowfall days in May: 0 days

Months with the highest number of snowfall days are January and February (3.8 days).
Months with the least snowfall days are April, May, June, July, August, September and October (0 days).

Average daylight in May / Average sunshine in May - Washington, DC
  • Average daylight in May: 14.3h

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

  • Average sunshine in May: 8.9h

The month with the most sunshine is July (Average sunshine: 10.7h).
Months with the least sunshine are January, February and December (Average sunshine: 5.1).

Average sunshine days in May - Washington, DC
  • Average sunshine days in May: 12.8 days

The month with the most sunshine days is November (20 days).
The month with the least sunshine days is May (12.8 days).

Average UV index in May - Washington, DC
  • Average UV index in May: 6

The month with the highest UV index is June (UV index 7).
Months with the lowest UV index are January and December (UV index 2).

Average cloud cover in May - Washington, DC
  • Average cloud cover in May: 43

The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 30).

Average visibility in May - Washington, DC
  • Average visibility in May: 5mi

Months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).