Washington Weather In May
The hottest day in Washington DC in May for the past 105 years was 96 degrees Fahrenheit, on May 14, 1956, and the mean high is 75. The lowest reported temperature in May for Washington for the past 105 years was 26 measured on May 11, 1966, and the normal low daily temperature is 50.
United States NWS historical Washington May Weather data records that on May 20, 1994, the high temperature did not exceed 50 degrees Fahrenheit, the lowest high measured in Washington in the past 105 years. The Weather Service additionally indicates that on May 30, 1969, the low for the day did not drop below 69 degrees, the highest low recorded in Washington in the last 105 years.
National Weather Service records indicate that the high temperature in Washington on May First averages 72 degrees and the high on the last day of the month averages 77 degrees. The daily low temperature in Washington on May First averages 44 degrees Fahrenheit and the low on the last day of May averages 53 degrees.
Washington usually receives an average of 4.22 inches of rain during the month. May Washington Weather records show that on May 23, 1949 Washington received 3.28 inches of rain, the most rain measured in a single day in May.