May weather forecast
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 moderately hot month in Washington, District of Columbia, with an average temperature fluctuating between 57°F (13.9°C) and 74.5°F (23.6°C).

Temperature

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

Humidity

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

Rainfall

In Washington, District of Columbia, in May, during 16.3 rainfall days, 2.64" (67mm) of precipitation is typically accumulated. In Washington, during the entire year, the rain falls for 149.1 days and collects up to 26.14" (664mm) of precipitation.

Snowfall

April through November are months without snowfall in Washington.

Daylight

In Washington, the average length of the day in May is 14h and 19min.
On the first day of May in Washington, District of Columbia, sunrise is at 6:09 am and sunset at 8:00 pm. On the last day of the month, sunrise is at 5:44 am and sunset at 8:26 pm EDT.

Sunshine

In May, the average sunshine in Washington is 8.9h.

UV index

The average daily maximum UV index in May in Washington is 6. A UV Index estimate of 6 to 7 represents a high health hazard from unsafe exposure to UV radiation for average individuals.
Note: In May, the average maximum UV index of 6 translate into the following recommendations:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. 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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the most humid month in Washington?

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

What is the average humidity in May in Washington?

In Washington, the average relative humidity in May is 76%.

How many days does it rain in May in Washington?

In May, 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 day length in May is 14h and 19min.

What time are sunrise and sunset in May in Washington?

On the first day of May, sunrise is at 6:09 am and sunset at 8:00 pm. On the last day of the month, sunrise is at 5:44 am and sunset at 8:26 pm EDT.

How many hours of sunshine does Washington have in May?

In May, the average sunshine duration in Washington, District of Columbia, is 8.9h.

How high is the UV index in May in Washington?

In Washington, the average daily maximum UV index in May is 6. A UV Index estimate of 6 to 7 represents a high health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Washington, DC

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).

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Average pressure in May
Washington, DC

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

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

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Average wind speed in May
Washington, DC

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).

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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%).
The 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: 2.64"

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

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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: 0"

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

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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

The months with the highest number of snowfall days are January and February (3.8 days).
The 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: 14h and 19min

The month with the longest days is June (Average daylight: 14h and 51min).
The month with the shortest days is December (Average daylight: 9h and 29min).

  • Average sunshine in May: 8h and 54min

The month with the most sunshine is July (Average sunshine: 10h and 42min).
The months with the least sunshine are January, February and December (Average sunshine: 5h and 6min).

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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).
The 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: 5mi

The 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).

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