Contents
- Weather in May
- Frequently asked questions
- Average temperature in May
- Average pressure in May
- Average wind speed in May
- Average humidity in May
- Average rainfall in May
- Average rainfall days in May
- Average snowfall in May
- Average snowfall days in May
- Average daylight in May
- Average sunshine in May
- Average sunshine days in May
- Average UV index in May
- Average cloud cover in May
- Average visibility in May
May
Weather in May
Temperature
May in Washington witnesses an increase in the average high-temperature, moving from an enjoyable 65.1°F (18.4°C) in April to a warm 74.5°F (23.6°C). An average nighttime temperature of 57°F (13.9°C) is recorded in Washington, District of Columbia, during May.Humidity
With an average relative humidity of 76%, May is the most humid month.Rainfall
In Washington, District of Columbia, in May, it is raining for 16.3 days, with typically 2.64" (67mm) of accumulated precipitation. 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, District of Columbia, the average length of the day in May is 14h and 19min.On the first day of the month, sunrise is at 6:09 am and sunset at 8:01 pm. On the last day of May, in Washington, sunrise is at 5:44 am and sunset at 8:27 pm EDT.
Sunshine
In May, the average sunshine is 8.9h.UV index
In Washington, the average daily maximum UV index in May is 6. A UV Index estimate of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for the average person.Note: The maximum daily UV index of 6 during May translates into the following directions:
Fend off overexposure. Sun protection is vital. Stay in the shade and limit direct sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its strongest. Remember, however, that not all shade structures provide full sun protection. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in May in Washington?
What is the most humid month in Washington?
What is the average humidity in May in Washington?
How many days does it rain in May in Washington?
When it does not snow in Washington?
What is the average length of the day in May in Washington?
When is the sunrise / sunset in May in Washington?
How many hours of sunshine does Washington have in May?
What is the UV index reading in May in Washington?
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"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).
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%).
The 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").
The 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
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).
Average daylight in May /
Average sunshine in May
Washington, DC
- Average daylight in May: 14h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in May: 8h and 5min
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).
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).
The 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
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).