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

Weather in May

The last month of the spring, May, is a warm month in Washington, District of Columbia, with average temperature varying between 57°F (13.9°C) and 74.5°F (23.6°C).

Temperature

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

Humidity

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

Rainfall

In May, the rain falls for 16.3 days. Throughout May, 2.64" (67mm) of precipitation is accumulated. Throughout the year, there are 149.1 rainfall days, and 26.14" (664mm) of precipitation is accumulated.

Snowfall

April through November are months without snowfall.

Daylight

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

Sunshine

The average sunshine in May is 8.9h.

UV index

The average daily maximum UV index in May is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from the exposure to the Sun's UV rays for average individuals.
Note: In May, the average maximum UV index of 6 translate into the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. 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.
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FAQ

What is the temperature in May in Washington?

In Washington, District of Columbia, 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 in Washington, District of Columbia, is 76%.

How many days does it rain in May in Washington?

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

When it does not snow in Washington?

April through November are months without snowfall.

How many hours of daylight does Washington have in May?

In Washington, District of Columbia, 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 in Washington is 8.9h.

What is the UV index reading in May in Washington?

The average daily maximum UV index in May in Washington is 6. A UV Index value of 6 to 7 symbolizes a high health risk from unprotected exposure to the UV radiation.

Average temperature in May
Washington, DC

Average temperature in May - Washington, DC
  • Average high temperature in May: 23.6°C

The warmest month (with the highest average high temperature) is July (31.1°C).
The month with the lowest average high temperature is January (4.8°C).

  • Average low temperature in May: 13.9°C

The month with the highest average low temperature is July (20.6°C).
The coldest month (with the lowest average low temperature) is January (-2.5°C).

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Average pressure in May
Washington, DC

Average pressure in May - Washington, DC
  • Average pressure in May: 1016.4mbar

The month with the highest atmospheric pressure is November (1020.6mbar).
The month with the lowest atmospheric pressure is June (1014.1mbar).

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Average wind speed in May
Washington, DC

Average wind speed in May - Washington, DC
  • Average wind speed in May: 10.4km/h

The windiest month (with the highest average wind speed) is March (12.7km/h).
The calmest month (with the lowest average wind speed) is August (8.1km/h).

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Average humidity in May
Washington, DC

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%).

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Average rainfall in May
Washington, DC

Average rainfall in May - Washington, DC
  • Average rainfall in May: 67mm

The wettest month (with the highest rainfall) is August (88mm).
The driest month (with the least rainfall) is January (40mm).

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Average rainfall days in May
Washington, DC

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).

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Average snowfall in May
Washington, DC

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

The month with the highest snowfall is January (55mm).
Months with the least snowfall are April, May, June, July, August, September, October and November (0mm).

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Average snowfall days in May
Washington, DC

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).

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Average daylight in May /
Average sunshine in May
Washington, DC

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).

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Average sunshine days in May
Washington, DC

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).

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Average UV index in May
Washington, DC

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).

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Average cloud cover in May
Washington, DC

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).

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Average visibility in May
Washington, DC

Average visibility in May - Washington, DC
  • Average visibility in May: 8km

Months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (9km).
The month with the lowest visibility is May (8km).

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